AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/09/02 23:41 flow patch-triage
1m Args: 
null

Results: 
{
  "EnableConfigs": [
    "DAMON",
    "DAMON_SYSFS",
    "DAMON_PADDR",
    "DAMON_VADDR"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_commit_ctx",
    "damon_set_schemes",
    "damon_new_scheme",
    "damos_commit_quota_goals",
    "damos_new_quota_goal",
    "damos_add_quota_goal",
    "damos_sysfs_set_quota_scores",
    "damos_sysfs_update_effective_quotas"
  ],
  "KMSANReasoning": "The patch modifies the calculation of the effective quota (`esz`) in DAMOS (`damos_set_effective_quota` in `mm/damon/core.c`) by resetting `esz` to 0 if `quota-\u003eesz_bp` is 0. This is purely an arithmetic / logic adjustment for DAMON quota management. It does not introduce or modify any uninitialized memory allocations, stack/heap buffers, branching on uninitialized variables, or user-space copy operations that could leak uninitialized bytes. Thus, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch alters the effective quota calculation logic in DAMON (Data Access Monitoring Framework) by explicitly setting the effective scheme size quota to 0 if esz_bp is 0. This changes DAMOS scheme quota enforcement and autotuning behavior, making it functionally impactful and worth fuzzing via the DAMON sysfs / kernel interfaces.",
  "WorthFuzzing": true
}
1/1 2026/09/02 23:41 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 83818fd34c053b1914b52cfcb9126fd8736d1d01\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Sep 2 23:41:39 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/mm/damon/core.c b/mm/damon/core.c\nindex df22621765911..73dc9a70fb12b 100644\n--- a/mm/damon/core.c\n+++ b/mm/damon/core.c\n@@ -3251,6 +3251,9 @@ static void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)\n \tif (quota-\u003esz \u0026\u0026 quota-\u003esz \u003c esz)\n \t\tesz = quota-\u003esz;\n \n+\tif (!quota-\u003eesz_bp)\n+\t\tesz = 0;\n+\n \tquota-\u003eesz = esz;\n }\n \n"
}
2/1 2026/09/02 23:41 agent patch-evaluator
1m Model: 
core

Args: 
null

Results: 
{
  "EnableConfigs": [
    "DAMON",
    "DAMON_SYSFS",
    "DAMON_PADDR",
    "DAMON_VADDR"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_commit_ctx",
    "damon_set_schemes",
    "damon_new_scheme",
    "damos_commit_quota_goals",
    "damos_new_quota_goal",
    "damos_add_quota_goal",
    "damos_sysfs_set_quota_scores",
    "damos_sysfs_update_effective_quotas"
  ],
  "Reasoning": "The patch alters the effective quota calculation logic in DAMON (Data Access Monitoring Framework) by explicitly setting the effective scheme size quota to 0 if esz_bp is 0. This changes DAMOS scheme quota enforcement and autotuning behavior, making it functionally impactful and worth fuzzing via the DAMON sysfs / kernel interfaces.",
  "WorthFuzzing": true
}

Instruction: 
You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Prompt: 
For your convenience, here is the diff of the changes:
commit 83818fd34c053b1914b52cfcb9126fd8736d1d01
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Sep 2 23:41:39 2026 +0000

    syz-cluster: applied patch under review

diff --git a/mm/damon/core.c b/mm/damon/core.c
index df22621765911..73dc9a70fb12b 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -3251,6 +3251,9 @@ static void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)
 	if (quota->sz && quota->sz < esz)
 		esz = quota->sz;
 
+	if (!quota->esz_bp)
+		esz = 0;
+
 	quota->esz = esz;
 }

3/2 2026/09/02 23:41 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 2052
							output: 37
							thoughts: 109

Thoughts: 
**Analyzing the DAMON Patch**

Okay, let's dive into this patch and understand the impact. The focus is on `mm/damon/core.c`, specifically the `damos_set_effective_quota` function. I see the addition of a conditional check: `if (!quota->esz_bp) esz = 0;`. Hmm, this seems like it's addressing an edge case related to the estimated size (`esz`) when `esz_bp` is null. So, potentially handling a situation where the quota isn't properly initialized.

Now I need to get a better grasp on the context here. I'll use either `read-file` or fire up `grepper` to examine the surrounding code in `mm/damon/core.c` around line 3251. Need to look into how `damos_set_effective_quota` is used within the DAMON subsystem, investigate any potential callers of this function, and check relevant configurations or related code paths. This will give me a clear picture of what this `esz` check is trying to address within the larger DAMON framework and what the likely implications are. I should also check if the `esz_bp` variable is used elsewhere in the file.

4/2 2026/09/02 23:41 tool read-file
0m Args: 
{
  "File": "mm/damon/core.c",
  "FirstLine": 3240,
  "LineCount": 50
}

Results: 
{
  "Contents": "3240:\t\n3241:\t\tif (quota-\u003ems) {\n3242:\t\t\tif (quota-\u003etotal_charged_ns)\n3243:\t\t\t\tthroughput = mult_frac(quota-\u003etotal_charged_sz,\n3244:\t\t\t\t\t\t1000000, quota-\u003etotal_charged_ns);\n3245:\t\t\telse\n3246:\t\t\t\tthroughput = PAGE_SIZE * 1024;\n3247:\t\t\tesz = min(throughput * quota-\u003ems, esz);\n3248:\t\t\tesz = max(ctx-\u003emin_region_sz, esz);\n3249:\t\t}\n3250:\t\n3251:\t\tif (quota-\u003esz \u0026\u0026 quota-\u003esz \u003c esz)\n3252:\t\t\tesz = quota-\u003esz;\n3253:\t\n3254:\t\tif (!quota-\u003eesz_bp)\n3255:\t\t\tesz = 0;\n3256:\t\n3257:\t\tquota-\u003eesz = esz;\n3258:\t}\n3259:\t\n3260:\tstatic void damos_trace_esz(struct damon_ctx *c, struct damos *s,\n3261:\t\t\tstruct damos_quota *quota)\n3262:\t{\n3263:\t\tunsigned int cidx = 0, sidx = 0;\n3264:\t\tstruct damos *siter;\n3265:\t\n3266:\t\tdamon_for_each_scheme(siter, c) {\n3267:\t\t\tif (siter == s)\n3268:\t\t\t\tbreak;\n3269:\t\t\tsidx++;\n3270:\t\t}\n3271:\t\ttrace_damos_esz(cidx, sidx, quota-\u003eesz);\n3272:\t}\n3273:\t\n3274:\tstatic void damos_adjust_quota(struct damon_ctx *c, struct damos *s)\n3275:\t{\n3276:\t\tstruct damos_quota *quota = \u0026s-\u003equota;\n3277:\t\tstruct damon_target *t;\n3278:\t\tstruct damon_region *r;\n3279:\t\tunsigned long cumulated_sz, cached_esz;\n3280:\t\tunsigned int score, max_score = 0;\n3281:\t\n3282:\t\tif (!quota-\u003ems \u0026\u0026 !quota-\u003esz \u0026\u0026 list_empty(\u0026quota-\u003egoals))\n3283:\t\t\treturn;\n3284:\t\n3285:\t\t/* First charge window */\n3286:\t\tif (!quota-\u003etotal_charged_sz \u0026\u0026 !quota-\u003echarged_from) {\n3287:\t\t\tquota-\u003echarged_from = jiffies;\n3288:\t\t\tdamos_set_effective_quota(c, s);\n3289:\t\t\tif (trace_damos_esz_enabled())\n"
}
5/2 2026/09/02 23:41 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 3200
							output: 27
							thoughts: 22

Thoughts: 
Here's my take on those thoughts:

**Checking DAMON Configuration Options**

Alright, let's dive right in. The first thing I need to do is pinpoint where the DAMON configuration options are defined. My gut tells me they'll be in the `Kconfig` file, likely within the `mm/damon` directory. So, let's head over to `mm/damon/Kconfig` and take a look. I'm expecting to find a few key things there: the main DAMON switch itself, probably a `bool` option, and then maybe some granular options for different DAMON components or features. It’s always the place to start when figuring out how a feature is configured in the kernel. This `Kconfig` file should give me the entry point for understanding all the dependencies and finer-grained controls. Time to see what's what!

6/2 2026/09/02 23:41 tool grepper
0m Args: 
{
  "Expression": "config DAMON",
  "PathPrefix": "mm/damon"
}

Results: 
{
  "Output": "mm/damon/Kconfig=3=menu \"Data Access Monitoring\"\nmm/damon/Kconfig-4-\nmm/damon/Kconfig:5:config DAMON\nmm/damon/Kconfig-6-\tbool \"DAMON: Data Access Monitoring Framework\"\n--\nmm/damon/Kconfig-14-\nmm/damon/Kconfig:15:config DAMON_DEBUG_SANITY\nmm/damon/Kconfig-16-\tbool \"Check sanity of DAMON code\"\n--\nmm/damon/Kconfig-25-\nmm/damon/Kconfig:26:config DAMON_KUNIT_TEST\nmm/damon/Kconfig-27-\tbool \"Test for damon\" if !KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig-37-\nmm/damon/Kconfig:38:config DAMON_VADDR\nmm/damon/Kconfig-39-\tbool \"Data access monitoring operations for virtual address spaces\"\n--\nmm/damon/Kconfig-46-\nmm/damon/Kconfig:47:config DAMON_PADDR\nmm/damon/Kconfig-48-\tbool \"Data access monitoring operations for the physical address space\"\n--\nmm/damon/Kconfig-55-\nmm/damon/Kconfig:56:config DAMON_VADDR_KUNIT_TEST\nmm/damon/Kconfig-57-\tbool \"Test for DAMON operations\" if !KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig-67-\nmm/damon/Kconfig:68:config DAMON_SYSFS\nmm/damon/Kconfig-69-\tbool \"DAMON sysfs interface\"\n--\nmm/damon/Kconfig-75-\nmm/damon/Kconfig:76:config DAMON_SYSFS_KUNIT_TEST\nmm/damon/Kconfig-77-\tbool \"Test for damon sysfs interface\" if !KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig-87-\nmm/damon/Kconfig:88:config DAMON_RECLAIM\nmm/damon/Kconfig-89-\tbool \"Build DAMON-based reclaim (DAMON_RECLAIM)\"\n--\nmm/damon/Kconfig-99-\nmm/damon/Kconfig:100:config DAMON_LRU_SORT\nmm/damon/Kconfig-101-\tbool \"Build DAMON-based LRU-lists sorting (DAMON_LRU_SORT)\"\n--\nmm/damon/Kconfig-107-\nmm/damon/Kconfig:108:config DAMON_STAT\nmm/damon/Kconfig-109-\tbool \"Build data access monitoring stat (DAMON_STAT)\"\n--\nmm/damon/Kconfig-115-\nmm/damon/Kconfig:116:config DAMON_STAT_ENABLED_DEFAULT\nmm/damon/Kconfig-117-\tbool \"Enable DAMON_STAT by default\"\n"
}
7/2 2026/09/02 23:41 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 4183
							output: 32
							thoughts: 25

Thoughts: 
Here's my take on the situation:

**Diving into the DAMON Implementation**

Okay, so I need to get a really solid grasp of how DAMON is structured. My first thought is to go straight for the jugular – the core of the implementation. I'm going to pore over both `mm/damon/Makefile` and `mm/damon/Kconfig`. `Makefile` will be key to understanding the build process, dependencies, and how all the DAMON source files fit together. I'll be looking for any hints about module compilation, compilation flags, and how this particular DAMON implementation links with the rest of the memory management subsystem.

Then, I'll hit `mm/damon/Kconfig`. This is where the configuration options live. I need to understand all the knobs and dials. I'll be looking for what features are enabled by default, what's optional, any dependencies between features, and how these options impact the overall behavior and performance characteristics of DAMON. This is critical for getting a complete understanding of the available configurations. I expect to see the selection of target selection algorithms, and any associated instrumentation features.

I'm aiming for a comprehensive view of these two files, so I can start to build a mental model of DAMON's architecture and how it's integrated with the kernel.

8/2 2026/09/02 23:41 tool read-file
0m Args: 
{
  "File": "mm/damon/Makefile",
  "FirstLine": 1,
  "LineCount": 20
}

Results: 
{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\t\n   3:\tobj-y\t\t\t\t:= core.o\n   4:\tobj-$(CONFIG_DAMON_VADDR)\t+= ops-common.o vaddr.o\n   5:\tobj-$(CONFIG_DAMON_PADDR)\t+= ops-common.o paddr.o\n   6:\tobj-$(CONFIG_DAMON_SYSFS)\t+= sysfs-common.o sysfs-schemes.o sysfs.o\n   7:\tobj-$(CONFIG_DAMON_RECLAIM)\t+= modules-common.o reclaim.o\n   8:\tobj-$(CONFIG_DAMON_LRU_SORT)\t+= modules-common.o lru_sort.o\n   9:\tobj-$(CONFIG_DAMON_STAT)\t+= modules-common.o stat.o\n"
}
9/2 2026/09/02 23:41 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 4740
							output: 33
							thoughts: 16

Thoughts: 
Here's my attempt at summarizing the thought process, tailored for an expert user:

**Diving into the Kernel Config: mm/damon/Kconfig**

Okay, time to check out `mm/damon/Kconfig`. I need to get a handle on the available configuration options for DAMON (Data Access Monitor). This file is the key to understanding how DAMON can be tweaked and integrated into a specific kernel build.

I'm specifically interested in:

*   **Understanding the scope:** What features are enabled by default, and which require explicit configuration?
*   **Dependencies:** Are there any prerequisite kernel features or other configurations that *must* be enabled for DAMON to function correctly? I'm thinking, for instance, are there any interactions with NUMA, Transparent Huge Pages (THP), or other memory management subsystems that I need to keep in mind?
*   **Configuration options**: What specific parameters can I tune to modify DAMON's behavior? Are there options related to the monitoring granularity, data collection frequency, or the actions taken when data access patterns are detected? I need to understand what trade-offs are offered via the configurable settings.
*   **Documentation in Kconfig:** Does it have adequate help text and explanations? Good documentation in the `Kconfig` files is critical. I'm hoping it's clear and concise, providing a good overview of each option's purpose and potential impact.

Basically, I want to form a complete mental map of the configuration space for DAMON. This is a crucial step before I can start experimenting with it or integrating it into a real-world scenario.

10/2 2026/09/02 23:41 tool read-file
0m Args: 
{
  "File": "mm/damon/Kconfig",
  "FirstLine": 1,
  "LineCount": 80
}

Results: 
{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t\n   3:\tmenu \"Data Access Monitoring\"\n   4:\t\n   5:\tconfig DAMON\n   6:\t\tbool \"DAMON: Data Access Monitoring Framework\"\n   7:\t\thelp\n   8:\t\t  This builds a framework that allows kernel subsystems to monitor\n   9:\t\t  access frequency of each memory region. The information can be useful\n  10:\t\t  for performance-centric DRAM level memory management.\n  11:\t\n  12:\t\t  See https://www.kernel.org/doc/html/latest/mm/damon/index.html for\n  13:\t\t  more information.\n  14:\t\n  15:\tconfig DAMON_DEBUG_SANITY\n  16:\t\tbool \"Check sanity of DAMON code\"\n  17:\t\tdepends on DAMON\n  18:\t\thelp\n  19:\t\t  This enables additional DAMON debugging-purpose sanity checks in\n  20:\t\t  DAMON code.  This can be useful for finding bugs, but impose\n  21:\t\t  additional overhead.  This is therefore recommended to be enabled on\n  22:\t\t  only development and test setups.\n  23:\t\n  24:\t\t  If unsure, say N.\n  25:\t\n  26:\tconfig DAMON_KUNIT_TEST\n  27:\t\tbool \"Test for damon\" if !KUNIT_ALL_TESTS\n  28:\t\tdepends on DAMON \u0026\u0026 KUNIT=y\n  29:\t\tdefault KUNIT_ALL_TESTS\n  30:\t\thelp\n  31:\t\t  This builds the DAMON Kunit test suite.\n  32:\t\n  33:\t\t  For more information on KUnit and unit tests in general, please refer\n  34:\t\t  to the KUnit documentation.\n  35:\t\n  36:\t\t  If unsure, say N.\n  37:\t\n  38:\tconfig DAMON_VADDR\n  39:\t\tbool \"Data access monitoring operations for virtual address spaces\"\n  40:\t\tdepends on DAMON \u0026\u0026 MMU\n  41:\t\tselect PAGE_IDLE_FLAG\n  42:\t\tdefault DAMON\n  43:\t\thelp\n  44:\t\t  This builds the default data access monitoring operations for DAMON\n  45:\t\t  that work for virtual address spaces.\n  46:\t\n  47:\tconfig DAMON_PADDR\n  48:\t\tbool \"Data access monitoring operations for the physical address space\"\n  49:\t\tdepends on DAMON \u0026\u0026 MMU\n  50:\t\tselect PAGE_IDLE_FLAG\n  51:\t\tdefault DAMON\n  52:\t\thelp\n  53:\t\t  This builds the default data access monitoring operations for DAMON\n  54:\t\t  that works for the physical address space.\n  55:\t\n  56:\tconfig DAMON_VADDR_KUNIT_TEST\n  57:\t\tbool \"Test for DAMON operations\" if !KUNIT_ALL_TESTS\n  58:\t\tdepends on DAMON_VADDR \u0026\u0026 KUNIT=y\n  59:\t\tdefault KUNIT_ALL_TESTS\n  60:\t\thelp\n  61:\t\t  This builds the DAMON virtual addresses operations Kunit test suite.\n  62:\t\n  63:\t\t  For more information on KUnit and unit tests in general, please refer\n  64:\t\t  to the KUnit documentation.\n  65:\t\n  66:\t\t  If unsure, say N.\n  67:\t\n  68:\tconfig DAMON_SYSFS\n  69:\t\tbool \"DAMON sysfs interface\"\n  70:\t\tdepends on DAMON \u0026\u0026 SYSFS\n  71:\t\tdefault DAMON\n  72:\t\thelp\n  73:\t\t  This builds the sysfs interface for DAMON.  The user space can use\n  74:\t\t  the interface for arbitrary data access monitoring.\n  75:\t\n  76:\tconfig DAMON_SYSFS_KUNIT_TEST\n  77:\t\tbool \"Test for damon sysfs interface\" if !KUNIT_ALL_TESTS\n  78:\t\tdepends on DAMON_SYSFS \u0026\u0026 KUNIT=y\n  79:\t\tdefault KUNIT_ALL_TESTS\n  80:\t\thelp\n"
}
11/2 2026/09/02 23:41 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 6175
							output: 21
							thoughts: 20

Thoughts: 
Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Investigating Kconfig Inclusion**

Alright, let's dive in. My immediate focus is understanding the broader context of `mm/damon/Kconfig` within the kernel's configuration landscape. I need to trace its inclusion path. I'll mentally map out the different Kconfig files, and their conditional dependencies, that might source this specific file. I'm going to quickly recall the typical include hierarchy within the kernel build system. I will need to consider the impact of any dependencies that `mm/damon/Kconfig` itself introduces. This line of inquiry aims to understand which features or modules trigger its involvement in the build, and subsequently, the specific configuration options it provides. This information is key to pinpointing how DAMON is actually configured and how its presence is determined during the build process. From there I can explore any relationships it has with the rest of the memory management subsystem.

12/2 2026/09/02 23:42 tool grepper
0m Args: 
{
  "Expression": "mm/damon/Kconfig"
}

Results: 
{
  "Output": "mm/Kconfig=1485=config LAZY_MMU_MODE_KUNIT_TEST\n--\nmm/Kconfig-1496-\nmm/Kconfig:1497:source \"mm/damon/Kconfig\"\nmm/Kconfig-1498-\n"
}
13/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 6500
							output: 30
							thoughts: 114

Thoughts: 
**DAMON Integration with Quotas: A Deep Dive**

Okay, let's break this down. My initial observation is that `CONFIG_DAMON` directly ties into the compilation of `mm/damon/core.o`, the heart of DAMON. Furthermore, `CONFIG_DAMON_SYSFS` is responsible for building the crucial sysfs interface, as seen in `mm/damon/sysfs.c`, `sysfs-schemes.c`, and `sysfs-common.c`. Now, my main focus shifts. I need to understand how DAMON, specifically in relation to DAMOS quotas, is interacted with at all. I have to look for functions or interfaces that relate to DAMOS Quotas in User Space.

My next step is to perform a targeted search. I'll need to locate calls to `damos_adjust_quota` and get a clear picture of user space and kernel control mechanisms for DAMON and DAMOS. This examination will reveal the points of integration and the architectural implications of the quota system.

14/2 2026/09/02 23:42 tool grepper
0m Args: 
{
  "Expression": "damos_adjust_quota",
  "PathPrefix": "mm/damon"
}

Results: 
{
  "Output": "mm/damon/core.c=3260=static void damos_trace_esz(struct damon_ctx *c, struct damos *s,\n--\nmm/damon/core.c-3273-\nmm/damon/core.c:3274:static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)\nmm/damon/core.c-3275-{\n--\nmm/damon/core.c=3355=static void kdamond_apply_schemes(struct damon_ctx *c)\n--\nmm/damon/core.c-3370-\nmm/damon/core.c:3371:\t\tdamos_adjust_quota(c, s);\nmm/damon/core.c-3372-\t}\n"
}
15/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 7077
							output: 25
							thoughts: 67

Thoughts: 
**Investigating DAMON's Configuration and Control**

Okay, so `kdamond_apply_schemes` is definitely the function being called within the `kdamond` worker thread. Now, I need to get a handle on how users interact with DAMON – how they start the whole thing, configure the schemes, and, crucially, how they set quotas. I'm going to dig into the user-facing APIs; I need to find the entry points. Let's start with sysfs, and see if the scheme quota attributes are exposed there. If not, I'll branch out to search for DAMON quota-related functions. Let's get this investigation started.

16/2 2026/09/02 23:42 tool grepper
0m Args: 
{
  "Expression": "quota",
  "PathPrefix": "mm/damon"
}

Results: 
{
  "Output": "\nFull output is too long, showing 500 out of 1424 lines.\nUse more precise expression if possible.\n\nmm/damon/core.c=683=void damos_destroy_filter(struct damos_filter *f)\n--\nmm/damon/core.c-688-\nmm/damon/core.c:689:struct damos_quota_goal *damos_new_quota_goal(\nmm/damon/core.c:690:\t\tenum damos_quota_goal_metric metric,\nmm/damon/core.c-691-\t\tunsigned long target_value)\nmm/damon/core.c-692-{\nmm/damon/core.c:693:\tstruct damos_quota_goal *goal;\nmm/damon/core.c-694-\n--\nmm/damon/core.c-705-\nmm/damon/core.c:706:void damos_add_quota_goal(struct damos_quota *q, struct damos_quota_goal *g)\nmm/damon/core.c-707-{\n--\nmm/damon/core.c-710-\nmm/damon/core.c:711:static void damos_del_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-712-{\n--\nmm/damon/core.c-715-\nmm/damon/core.c:716:static void damos_free_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-717-{\n--\nmm/damon/core.c-720-\nmm/damon/core.c:721:void damos_destroy_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-722-{\nmm/damon/core.c:723:\tdamos_del_quota_goal(g);\nmm/damon/core.c:724:\tdamos_free_quota_goal(g);\nmm/damon/core.c-725-}\nmm/damon/core.c-726-\nmm/damon/core.c:727:static bool damos_quota_goals_empty(struct damos_quota *q)\nmm/damon/core.c-728-{\n--\nmm/damon/core.c-731-\nmm/damon/core.c:732:/* initialize fields of @quota that normally API users wouldn't set */\nmm/damon/core.c:733:static struct damos_quota *damos_quota_init(struct damos_quota *quota)\nmm/damon/core.c-734-{\nmm/damon/core.c:735:\tquota-\u003eesz = 0;\nmm/damon/core.c:736:\tquota-\u003etotal_charged_sz = 0;\nmm/damon/core.c:737:\tquota-\u003etotal_charged_ns = 0;\nmm/damon/core.c:738:\tquota-\u003echarged_sz = 0;\nmm/damon/core.c:739:\tquota-\u003echarged_from = 0;\nmm/damon/core.c:740:\tquota-\u003echarge_target_from = NULL;\nmm/damon/core.c:741:\tquota-\u003echarge_addr_from = 0;\nmm/damon/core.c:742:\tquota-\u003eesz_bp = 0;\nmm/damon/core.c:743:\treturn quota;\nmm/damon/core.c-744-}\n--\nmm/damon/core.c=746=struct damos *damon_new_scheme(struct damos_access_pattern *pattern,\n--\nmm/damon/core.c-748-\t\t\tunsigned long apply_interval_us,\nmm/damon/core.c:749:\t\t\tstruct damos_quota *quota,\nmm/damon/core.c-750-\t\t\tstruct damos_watermarks *wmarks,\n--\nmm/damon/core.c-774-\nmm/damon/core.c:775:\tscheme-\u003equota = *(damos_quota_init(quota));\nmm/damon/core.c:776:\t/* quota.goals should be separately set by caller */\nmm/damon/core.c:777:\tINIT_LIST_HEAD(\u0026scheme-\u003equota.goals);\nmm/damon/core.c-778-\n--\nmm/damon/core.c=815=void damon_destroy_scheme(struct damos *s)\nmm/damon/core.c-816-{\nmm/damon/core.c:817:\tstruct damos_quota_goal *g, *g_next;\nmm/damon/core.c-818-\tstruct damos_filter *f, *next;\nmm/damon/core.c-819-\nmm/damon/core.c:820:\tdamos_for_each_quota_goal_safe(g, g_next, \u0026s-\u003equota)\nmm/damon/core.c:821:\t\tdamos_destroy_quota_goal(g);\nmm/damon/core.c-822-\n--\nmm/damon/core.c=1166=void damon_set_schemes(struct damon_ctx *ctx, struct damos **schemes,\n--\nmm/damon/core.c-1177-\nmm/damon/core.c:1178:static struct damos_quota_goal *damos_nth_quota_goal(\nmm/damon/core.c:1179:\t\tint n, struct damos_quota *q)\nmm/damon/core.c-1180-{\nmm/damon/core.c:1181:\tstruct damos_quota_goal *goal;\nmm/damon/core.c-1182-\tint i = 0;\nmm/damon/core.c-1183-\nmm/damon/core.c:1184:\tdamos_for_each_quota_goal(goal, q) {\nmm/damon/core.c-1185-\t\tif (i++ == n)\n--\nmm/damon/core.c-1190-\nmm/damon/core.c:1191:static void damos_commit_quota_goal_union(\nmm/damon/core.c:1192:\t\tstruct damos_quota_goal *dst, struct damos_quota_goal *src)\nmm/damon/core.c-1193-{\n--\nmm/damon/core.c-1214-\nmm/damon/core.c:1215:static void damos_commit_quota_goal(\nmm/damon/core.c:1216:\t\tstruct damos_quota_goal *dst, struct damos_quota_goal *src)\nmm/damon/core.c-1217-{\n--\nmm/damon/core.c-1221-\t\tdst-\u003ecurrent_value = src-\u003ecurrent_value;\nmm/damon/core.c:1222:\tdamos_commit_quota_goal_union(dst, src);\nmm/damon/core.c-1223-}\n--\nmm/damon/core.c-1225-/**\nmm/damon/core.c:1226: * damos_commit_quota_goals() - Commit DAMOS quota goals to another quota.\nmm/damon/core.c:1227: * @dst:\tThe commit destination DAMOS quota.\nmm/damon/core.c:1228: * @src:\tThe commit source DAMOS quota.\nmm/damon/core.c-1229- *\nmm/damon/core.c:1230: * Copies user-specified parameters for quota goals from @src to @dst.  Users\nmm/damon/core.c:1231: * should use this function for quota goals-level parameters update of running\nmm/damon/core.c-1232- * DAMON contexts, instead of manual in-place updates.\n--\nmm/damon/core.c-1236- */\nmm/damon/core.c:1237:int damos_commit_quota_goals(struct damos_quota *dst, struct damos_quota *src)\nmm/damon/core.c-1238-{\nmm/damon/core.c:1239:\tstruct damos_quota_goal *dst_goal, *next, *src_goal, *new_goal;\nmm/damon/core.c-1240-\tint i = 0, j = 0;\nmm/damon/core.c-1241-\nmm/damon/core.c:1242:\tdamos_for_each_quota_goal_safe(dst_goal, next, dst) {\nmm/damon/core.c:1243:\t\tsrc_goal = damos_nth_quota_goal(i++, src);\nmm/damon/core.c-1244-\t\tif (src_goal)\nmm/damon/core.c:1245:\t\t\tdamos_commit_quota_goal(dst_goal, src_goal);\nmm/damon/core.c-1246-\t\telse\nmm/damon/core.c:1247:\t\t\tdamos_destroy_quota_goal(dst_goal);\nmm/damon/core.c-1248-\t}\nmm/damon/core.c:1249:\tdamos_for_each_quota_goal_safe(src_goal, next, src) {\nmm/damon/core.c-1250-\t\tif (j++ \u003c i)\nmm/damon/core.c-1251-\t\t\tcontinue;\nmm/damon/core.c:1252:\t\tnew_goal = damos_new_quota_goal(\nmm/damon/core.c-1253-\t\t\t\tsrc_goal-\u003emetric, src_goal-\u003etarget_value);\n--\nmm/damon/core.c-1255-\t\t\treturn -ENOMEM;\nmm/damon/core.c:1256:\t\tdamos_commit_quota_goal(new_goal, src_goal);\nmm/damon/core.c:1257:\t\tdamos_add_quota_goal(dst, new_goal);\nmm/damon/core.c-1258-\t}\n--\nmm/damon/core.c-1261-\nmm/damon/core.c:1262:static int damos_commit_quota(struct damos_quota *dst, struct damos_quota *src)\nmm/damon/core.c-1263-{\n--\nmm/damon/core.c-1268-\tdst-\u003esz = src-\u003esz;\nmm/damon/core.c:1269:\terr = damos_commit_quota_goals(dst, src);\nmm/damon/core.c-1270-\tif (err)\n--\nmm/damon/core.c=1519=static int damos_commit(struct damos *dst, struct damos *src)\n--\nmm/damon/core.c-1526-\nmm/damon/core.c:1527:\terr = damos_commit_quota(\u0026dst-\u003equota, \u0026src-\u003equota);\nmm/damon/core.c-1528-\tif (err)\n--\nmm/damon/core.c=1546=static int damon_commit_schemes(struct damon_ctx *dst, struct damon_ctx *src)\n--\nmm/damon/core.c-1567-\t\t\t\tsrc_scheme-\u003eapply_interval_us,\nmm/damon/core.c:1568:\t\t\t\t\u0026src_scheme-\u003equota, \u0026src_scheme-\u003ewmarks,\nmm/damon/core.c-1569-\t\t\t\tNUMA_NO_NODE);\n--\nmm/damon/core.c=1679=static int damon_commit_targets(\n--\nmm/damon/core.c-1705-\t\t\tdamon_for_each_scheme(s, dst) {\nmm/damon/core.c:1706:\t\t\t\tif (s-\u003equota.charge_target_from == dst_target) {\nmm/damon/core.c:1707:\t\t\t\t\ts-\u003equota.charge_target_from = NULL;\nmm/damon/core.c:1708:\t\t\t\t\ts-\u003equota.charge_addr_from = 0;\nmm/damon/core.c-1709-\t\t\t\t}\n--\nmm/damon/core.c=1862=static int __damon_commit_ctx(struct damon_ctx *dst, struct damon_ctx *src)\n--\nmm/damon/core.c-1865-\tstruct damos *scheme;\nmm/damon/core.c:1866:\tstruct damos_quota_goal *goal;\nmm/damon/core.c-1867-\n--\nmm/damon/core.c-1874-\t\tdamon_for_each_scheme(scheme, src) {\nmm/damon/core.c:1875:\t\t\tstruct damos_quota *quota = \u0026scheme-\u003equota;\nmm/damon/core.c-1876-\nmm/damon/core.c:1877:\t\t\tdamos_for_each_quota_goal(goal, quota) {\nmm/damon/core.c-1878-\t\t\t\tif (goal-\u003emetric ==\n--\nmm/damon/core.c=2371=static bool __damos_valid_target(struct damon_region *r, struct damos *s,\n--\nmm/damon/core.c-2386-/*\nmm/damon/core.c:2387: * damos_quota_is_set() - Return if the given quota is actually set.\nmm/damon/core.c:2388: * @quota:\tThe quota to check.\nmm/damon/core.c-2389- *\nmm/damon/core.c:2390: * Returns true if the quota is set, false otherwise.\nmm/damon/core.c-2391- */\nmm/damon/core.c:2392:static bool damos_quota_is_set(struct damos_quota *quota)\nmm/damon/core.c-2393-{\nmm/damon/core.c:2394:\treturn quota-\u003eesz || quota-\u003esz || quota-\u003ems ||\nmm/damon/core.c:2395:\t\t!damos_quota_goals_empty(quota);\nmm/damon/core.c-2396-}\n--\nmm/damon/core.c=2398=static bool damos_valid_target(struct damon_ctx *c, struct damon_region *r,\n--\nmm/damon/core.c-2402-\nmm/damon/core.c:2403:\tif (!ret || !damos_quota_is_set(\u0026s-\u003equota) || !c-\u003eops.get_scheme_score)\nmm/damon/core.c-2404-\t\treturn ret;\nmm/damon/core.c-2405-\nmm/damon/core.c:2406:\treturn c-\u003eops.get_scheme_score(c, r, s) \u003e= s-\u003equota.min_score;\nmm/damon/core.c-2407-}\n--\nmm/damon/core.c-2410- * damos_skip_charged_region() - Check if the given region or starting part of\nmm/damon/core.c:2411: * it is already charged for the DAMOS quota.\nmm/damon/core.c-2412- * @t:\tThe target of the region.\n--\nmm/damon/core.c-2416- *\nmm/damon/core.c:2417: * If a quota of a scheme has exceeded in a quota charge window, the scheme's\nmm/damon/core.c-2418- * action would applied to only a part of the target access pattern fulfilling\n--\nmm/damon/core.c=2434=static bool damos_skip_charged_region(struct damon_target *t,\n--\nmm/damon/core.c-2437-{\nmm/damon/core.c:2438:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-2439-\tunsigned long sz_to_skip;\n--\nmm/damon/core.c-2441-\t/* Skip previously charged regions */\nmm/damon/core.c:2442:\tif (quota-\u003echarge_target_from) {\nmm/damon/core.c:2443:\t\tif (t != quota-\u003echarge_target_from)\nmm/damon/core.c-2444-\t\t\treturn true;\nmm/damon/core.c-2445-\t\tif (r == damon_last_region(t)) {\nmm/damon/core.c:2446:\t\t\tquota-\u003echarge_target_from = NULL;\nmm/damon/core.c:2447:\t\t\tquota-\u003echarge_addr_from = 0;\nmm/damon/core.c-2448-\t\t\treturn true;\nmm/damon/core.c-2449-\t\t}\nmm/damon/core.c:2450:\t\tif (quota-\u003echarge_addr_from \u0026\u0026\nmm/damon/core.c:2451:\t\t\t\tr-\u003ear.end \u003c= quota-\u003echarge_addr_from)\nmm/damon/core.c-2452-\t\t\treturn true;\nmm/damon/core.c-2453-\nmm/damon/core.c:2454:\t\tif (quota-\u003echarge_addr_from \u0026\u0026 r-\u003ear.start \u003c\nmm/damon/core.c:2455:\t\t\t\tquota-\u003echarge_addr_from) {\nmm/damon/core.c:2456:\t\t\tsz_to_skip = ALIGN_DOWN(quota-\u003echarge_addr_from -\nmm/damon/core.c-2457-\t\t\t\t\tr-\u003ear.start, min_region_sz);\n--\nmm/damon/core.c-2465-\t\t}\nmm/damon/core.c:2466:\t\tquota-\u003echarge_target_from = NULL;\nmm/damon/core.c:2467:\t\tquota-\u003echarge_addr_from = 0;\nmm/damon/core.c-2468-\t}\n--\nmm/damon/core.c=2619=static void damos_walk_cancel(struct damon_ctx *ctx)\n--\nmm/damon/core.c-2635-\nmm/damon/core.c:2636:static void damos_charge_quota(struct damos_quota *quota,\nmm/damon/core.c-2637-\t\tunsigned long sz_region, unsigned long sz_applied)\n--\nmm/damon/core.c-2643-\t */\nmm/damon/core.c:2644:\tif (!quota-\u003efail_charge_denom || sz_applied \u003e sz_region)\nmm/damon/core.c:2645:\t\tquota-\u003echarged_sz += sz_region;\nmm/damon/core.c-2646-\telse\nmm/damon/core.c:2647:\t\tquota-\u003echarged_sz += sz_applied + mult_frac(\nmm/damon/core.c-2648-\t\t\t\t(sz_region - sz_applied),\nmm/damon/core.c:2649:\t\t\t\tquota-\u003efail_charge_num,\nmm/damon/core.c:2650:\t\t\t\tquota-\u003efail_charge_denom);\nmm/damon/core.c-2651-}\nmm/damon/core.c-2652-\nmm/damon/core.c:2653:static bool damos_quota_is_full(struct damos_quota *quota,\nmm/damon/core.c-2654-\t\tunsigned long min_region_sz)\nmm/damon/core.c-2655-{\nmm/damon/core.c:2656:\tif (!damos_quota_is_set(quota))\nmm/damon/core.c-2657-\t\treturn false;\nmm/damon/core.c:2658:\tif (quota-\u003echarged_sz \u003e= quota-\u003eesz)\nmm/damon/core.c-2659-\t\treturn true;\n--\nmm/damon/core.c-2661-\t * DAMOS action is applied per region, so \u003cmin_region_sz remaining\nmm/damon/core.c:2662:\t * quota means the quota is effectively full.\nmm/damon/core.c-2663-\t */\nmm/damon/core.c:2664:\treturn quota-\u003eesz - quota-\u003echarged_sz \u003c min_region_sz;\nmm/damon/core.c-2665-}\n--\nmm/damon/core.c=2667=static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t,\n--\nmm/damon/core.c-2669-{\nmm/damon/core.c:2670:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-2671-\tunsigned long sz = damon_sz_region(r);\n--\nmm/damon/core.c-2704-\tif (c-\u003eops.apply_scheme) {\nmm/damon/core.c:2705:\t\tif (damos_quota_is_set(quota) \u0026\u0026\nmm/damon/core.c:2706:\t\t\t\tquota-\u003echarged_sz + sz \u003e quota-\u003eesz) {\nmm/damon/core.c:2707:\t\t\tsz = ALIGN_DOWN(quota-\u003eesz - quota-\u003echarged_sz,\nmm/damon/core.c-2708-\t\t\t\t\tc-\u003emin_region_sz);\n--\nmm/damon/core.c-2722-\t\tktime_get_coarse_ts64(\u0026end);\nmm/damon/core.c:2723:\t\tquota-\u003etotal_charged_ns += timespec64_to_ns(\u0026end) -\nmm/damon/core.c-2724-\t\t\ttimespec64_to_ns(\u0026begin);\nmm/damon/core.c:2725:\t\tdamos_charge_quota(quota, sz, sz_applied);\nmm/damon/core.c:2726:\t\tif (damos_quota_is_full(quota, c-\u003emin_region_sz)) {\nmm/damon/core.c:2727:\t\t\tquota-\u003echarge_target_from = t;\nmm/damon/core.c:2728:\t\t\tquota-\u003echarge_addr_from = r-\u003ear.end;\nmm/damon/core.c-2729-\t\t}\n--\nmm/damon/core.c=2738=static void damon_do_apply_schemes(struct damon_ctx *c,\n--\nmm/damon/core.c-2744-\tdamon_for_each_scheme(s, c) {\nmm/damon/core.c:2745:\t\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-2746-\n--\nmm/damon/core.c-2752-\nmm/damon/core.c:2753:\t\t/* Check the quota */\nmm/damon/core.c:2754:\t\tif (damos_quota_is_full(quota, c-\u003emin_region_sz))\nmm/damon/core.c-2755-\t\t\tcontinue;\n--\nmm/damon/core.c-2777- *\nmm/damon/core.c:2778: * This function could split regions for keeping the quota.  To minimize\nmm/damon/core.c-2779- * overhead from the split operations increased number of regions, this\n--\nmm/damon/core.c=2790=static void damos_apply_target(struct damon_ctx *c, struct damon_target *t,\n--\nmm/damon/core.c-2800-\t\t * damon_do_apply_scheems() could split the region for the\nmm/damon/core.c:2801:\t\t * quota.  Keeping the new slices is an overhead.  Merge back\nmm/damon/core.c-2802-\t\t * the slices into the previous region if it doesn't lose any\n--\nmm/damon/core.c=2900=static __kernel_ulong_t damos_get_node_mem_bp(\nmm/damon/core.c:2901:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-2902-{\n--\nmm/damon/core.c=2928=static unsigned long damos_get_node_memcg_used_bp(\nmm/damon/core.c:2929:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-2930-{\n--\nmm/damon/core.c=3082=static __kernel_ulong_t damos_get_node_mem_bp(\nmm/damon/core.c:3083:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-3084-{\n--\nmm/damon/core.c=3088=static unsigned long damos_get_node_memcg_used_bp(\nmm/damon/core.c:3089:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-3090-{\n--\nmm/damon/core.c=3119=static unsigned int damos_hugepage_mem_bp(void)\n--\nmm/damon/core.c-3134-\nmm/damon/core.c:3135:static void damos_set_quota_goal_current_value(struct damon_ctx *c,\nmm/damon/core.c:3136:\t\tstruct damos *s, struct damos_quota_goal *goal)\nmm/damon/core.c-3137-{\n--\nmm/damon/core.c-3179-/* Return the highest score since it makes schemes least aggressive */\nmm/damon/core.c:3180:static unsigned long damos_quota_score(struct damon_ctx *c, struct damos *s)\nmm/damon/core.c-3181-{\nmm/damon/core.c:3182:\tstruct damos_quota_goal *goal;\nmm/damon/core.c:3183:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-3184-\tunsigned long highest_score = 0;\nmm/damon/core.c-3185-\nmm/damon/core.c:3186:\tdamos_for_each_quota_goal(goal, quota) {\nmm/damon/core.c:3187:\t\tdamos_set_quota_goal_current_value(c, s, goal);\nmm/damon/core.c-3188-\t\thighest_score = max(highest_score,\n--\nmm/damon/core.c=3196=static void damos_goal_tune_esz_bp_consist(struct damon_ctx *c, struct damos *s)\nmm/damon/core.c-3197-{\nmm/damon/core.c:3198:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c:3199:\tunsigned long score = damos_quota_score(c, s);\nmm/damon/core.c-3200-\nmm/damon/core.c:3201:\tquota-\u003eesz_bp = damon_feed_loop_next_input(\nmm/damon/core.c:3202:\t\t\tmax(quota-\u003eesz_bp, 10000UL), score);\nmm/damon/core.c-3203-}\n--\nmm/damon/core.c=3205=static void damos_goal_tune_esz_bp_temporal(struct damon_ctx *c,\n--\nmm/damon/core.c-3207-{\nmm/damon/core.c:3208:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c:3209:\tunsigned long score = damos_quota_score(c, s);\nmm/damon/core.c-3210-\nmm/damon/core.c-3211-\tif (score \u003e= 10000)\nmm/damon/core.c:3212:\t\tquota-\u003eesz_bp = 0;\nmm/damon/core.c:3213:\telse if (quota-\u003esz)\nmm/damon/core.c:3214:\t\tquota-\u003eesz_bp = quota-\u003esz * 10000;\nmm/damon/core.c-3215-\telse\nmm/damon/core.c:3216:\t\tquota-\u003eesz_bp = ULONG_MAX;\nmm/damon/core.c-3217-}\n--\nmm/damon/core.c-3219-/*\nmm/damon/core.c:3220: * Called only if quota-\u003ems, or quota-\u003esz are set, or quota-\u003egoals is not empty\nmm/damon/core.c-3221- */\nmm/damon/core.c:3222:static void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)\nmm/damon/core.c-3223-{\nmm/damon/core.c:3224:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-3225-\tunsigned long throughput;\n--\nmm/damon/core.c-3227-\nmm/damon/core.c:3228:\tif (!quota-\u003ems \u0026\u0026 list_empty(\u0026quota-\u003egoals)) {\nmm/damon/core.c:3229:\t\tquota-\u003eesz = quota-\u003esz;\nmm/damon/core.c-3230-\t\treturn;\n--\nmm/damon/core.c-3232-\nmm/damon/core.c:3233:\tif (!list_empty(\u0026quota-\u003egoals)) {\nmm/damon/core.c:3234:\t\tif (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_CONSIST)\nmm/damon/core.c-3235-\t\t\tdamos_goal_tune_esz_bp_consist(ctx, s);\nmm/damon/core.c:3236:\t\telse if (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_TEMPORAL)\nmm/damon/core.c-3237-\t\t\tdamos_goal_tune_esz_bp_temporal(ctx, s);\nmm/damon/core.c:3238:\t\tesz = quota-\u003eesz_bp / 10000;\nmm/damon/core.c-3239-\t}\nmm/damon/core.c-3240-\nmm/damon/core.c:3241:\tif (quota-\u003ems) {\nmm/damon/core.c:3242:\t\tif (quota-\u003etotal_charged_ns)\nmm/damon/core.c:3243:\t\t\tthroughput = mult_frac(quota-\u003etotal_charged_sz,\nmm/damon/core.c:3244:\t\t\t\t\t1000000, quota-\u003etotal_charged_ns);\nmm/damon/core.c-3245-\t\telse\nmm/damon/core.c-3246-\t\t\tthroughput = PAGE_SIZE * 1024;\nmm/damon/core.c:3247:\t\tesz = min(throughput * quota-\u003ems, esz);\nmm/damon/core.c-3248-\t\tesz = max(ctx-\u003emin_region_sz, esz);\n--\nmm/damon/core.c-3250-\nmm/damon/core.c:3251:\tif (quota-\u003esz \u0026\u0026 quota-\u003esz \u003c esz)\nmm/damon/core.c:3252:\t\tesz = quota-\u003esz;\nmm/damon/core.c-3253-\nmm/damon/core.c:3254:\tif (!quota-\u003eesz_bp)\nmm/damon/core.c-3255-\t\tesz = 0;\nmm/damon/core.c-3256-\nmm/damon/core.c:3257:\tquota-\u003eesz = esz;\nmm/damon/core.c-3258-}\n--\nmm/damon/core.c=3260=static void damos_trace_esz(struct damon_ctx *c, struct damos *s,\nmm/damon/core.c:3261:\t\tstruct damos_quota *quota)\nmm/damon/core.c-3262-{\n--\nmm/damon/core.c-3270-\t}\nmm/damon/core.c:3271:\ttrace_damos_esz(cidx, sidx, quota-\u003eesz);\nmm/damon/core.c-3272-}\nmm/damon/core.c-3273-\nmm/damon/core.c:3274:static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)\nmm/damon/core.c-3275-{\nmm/damon/core.c:3276:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-3277-\tstruct damon_target *t;\n--\nmm/damon/core.c-3281-\nmm/damon/core.c:3282:\tif (!quota-\u003ems \u0026\u0026 !quota-\u003esz \u0026\u0026 list_empty(\u0026quota-\u003egoals))\nmm/damon/core.c-3283-\t\treturn;\n--\nmm/damon/core.c-3285-\t/* First charge window */\nmm/damon/core.c:3286:\tif (!quota-\u003etotal_charged_sz \u0026\u0026 !quota-\u003echarged_from) {\nmm/damon/core.c:3287:\t\tquota-\u003echarged_from = jiffies;\nmm/damon/core.c:3288:\t\tdamos_set_effective_quota(c, s);\nmm/damon/core.c-3289-\t\tif (trace_damos_esz_enabled())\nmm/damon/core.c:3290:\t\t\tdamos_trace_esz(c, s, quota);\nmm/damon/core.c-3291-\t}\n--\nmm/damon/core.c-3293-\t/* New charge window starts */\nmm/damon/core.c:3294:\tif (!time_in_range_open(jiffies, quota-\u003echarged_from,\nmm/damon/core.c:3295:\t\t\t\tquota-\u003echarged_from +\nmm/damon/core.c:3296:\t\t\t\tmsecs_to_jiffies(quota-\u003ereset_interval))) {\nmm/damon/core.c:3297:\t\tif (damos_quota_is_full(quota, c-\u003emin_region_sz))\nmm/damon/core.c-3298-\t\t\ts-\u003estat.qt_exceeds++;\nmm/damon/core.c:3299:\t\tquota-\u003etotal_charged_sz += quota-\u003echarged_sz;\nmm/damon/core.c:3300:\t\tquota-\u003echarged_from = jiffies;\nmm/damon/core.c:3301:\t\tquota-\u003echarged_sz = 0;\nmm/damon/core.c-3302-\t\tif (trace_damos_esz_enabled())\nmm/damon/core.c:3303:\t\t\tcached_esz = quota-\u003eesz;\nmm/damon/core.c:3304:\t\tdamos_set_effective_quota(c, s);\nmm/damon/core.c:3305:\t\tif (trace_damos_esz_enabled() \u0026\u0026 quota-\u003eesz != cached_esz)\nmm/damon/core.c:3306:\t\t\tdamos_trace_esz(c, s, quota);\nmm/damon/core.c-3307-\t}\n--\nmm/damon/core.c-3332-\t\tcumulated_sz += c-\u003eregions_score_histogram[score];\nmm/damon/core.c:3333:\t\tif (cumulated_sz \u003e= quota-\u003eesz || !score)\nmm/damon/core.c-3334-\t\t\tbreak;\nmm/damon/core.c-3335-\t}\nmm/damon/core.c:3336:\tquota-\u003emin_score = score;\nmm/damon/core.c-3337-}\n--\nmm/damon/core.c=3355=static void kdamond_apply_schemes(struct damon_ctx *c)\n--\nmm/damon/core.c-3370-\nmm/damon/core.c:3371:\t\tdamos_adjust_quota(c, s);\nmm/damon/core.c-3372-\t}\n--\nmm/damon/lru_sort.c=39=static bool commit_inputs __read_mostly;\n--\nmm/damon/lru_sort.c-43- *\nmm/damon/lru_sort.c:44: * While keeping the caps that set by other quotas, DAMON_LRU_SORT\nmm/damon/lru_sort.c:45: * automatically increases and decreases the effective level of the quota\nmm/damon/lru_sort.c-46- * aiming the LRU [de]prioritizations of the hot and cold memory resulting in\n--\nmm/damon/lru_sort.c=104=module_param(cold_min_age, ulong, 0600);\nmm/damon/lru_sort.c-105-\nmm/damon/lru_sort.c:106:static struct damos_quota damon_lru_sort_quota = {\nmm/damon/lru_sort.c-107-\t/* Use up to 10 ms per 1 sec, by default */\n--\nmm/damon/lru_sort.c-110-\t.reset_interval = 1000,\nmm/damon/lru_sort.c:111:\t/* Within the quota, mark hotter regions accessed first. */\nmm/damon/lru_sort.c-112-\t.weight_sz = 0,\n--\nmm/damon/lru_sort.c-115-};\nmm/damon/lru_sort.c:116:DEFINE_DAMON_MODULES_DAMOS_TIME_QUOTA(damon_lru_sort_quota);\nmm/damon/lru_sort.c-117-\n--\nmm/damon/lru_sort.c=164=DEFINE_DAMON_MODULES_DAMOS_STATS_PARAMS(damon_lru_sort_hot_stat,\nmm/damon/lru_sort.c-165-\t\tlru_sort_tried_hot_regions, lru_sorted_hot_regions,\nmm/damon/lru_sort.c:166:\t\thot_quota_exceeds);\nmm/damon/lru_sort.c-167-\n--\nmm/damon/lru_sort.c=169=DEFINE_DAMON_MODULES_DAMOS_STATS_PARAMS(damon_lru_sort_cold_stat,\nmm/damon/lru_sort.c-170-\t\tlru_sort_tried_cold_regions, lru_sorted_cold_regions,\nmm/damon/lru_sort.c:171:\t\tcold_quota_exceeds);\nmm/damon/lru_sort.c-172-\n--\nmm/damon/lru_sort.c=188=static struct damos *damon_lru_sort_new_scheme(\n--\nmm/damon/lru_sort.c-190-{\nmm/damon/lru_sort.c:191:\tstruct damos_quota quota = damon_lru_sort_quota;\nmm/damon/lru_sort.c-192-\nmm/damon/lru_sort.c:193:\t/* Use half of total quota for hot/cold pages sorting */\nmm/damon/lru_sort.c:194:\tquota.ms = quota.ms / 2;\nmm/damon/lru_sort.c-195-\n--\nmm/damon/lru_sort.c-202-\t\t\t0,\nmm/damon/lru_sort.c:203:\t\t\t/* under the quota. */\nmm/damon/lru_sort.c:204:\t\t\t\u0026quota,\nmm/damon/lru_sort.c-205-\t\t\t/* (De)activate this according to the watermarks. */\n--\nmm/damon/lru_sort.c=220=static struct damos *damon_lru_sort_new_cold_scheme(unsigned int cold_thres)\n--\nmm/damon/lru_sort.c-228-\nmm/damon/lru_sort.c:229:static int damon_lru_sort_add_quota_goals(struct damos *hot_scheme,\nmm/damon/lru_sort.c-230-\t\tstruct damos *cold_scheme)\n\n"
}
17/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 17914
							output: 29
							thoughts: 82

Thoughts: 
Okay, let's break this down.

**DAMON Configuration and Accessibility**

Right, so DAMON, the Data Access Monitor, has a few access routes, depending on the kernel configuration. First, and likely most straightforward, it's accessible through sysfs. That's the go-to usually, and I would check `/sys/kernel/mm/damon/admin/...` if `CONFIG_DAMON_SYSFS` is enabled, as it probably will be. But if that's not available, or I'm doing something more specific, it can also be accessed through debugfs or module parameters, under specific configurations like `CONFIG_DAMON_RECLAIM` or `CONFIG_DAMON_LRU_SORT`. Good to know the alternatives.

Now, I'm thinking I need to investigate its exposure in sysfs first. Let's see how that's structured.

18/2 2026/09/02 23:42 tool grepper
0m Args: 
{
  "Expression": "damos_sysfs",
  "PathPrefix": "mm/damon"
}

Results: 
{
  "Output": "\nFull output is too long, showing 500 out of 802 lines.\nUse more precise expression if possible.\n\nmm/damon/sysfs-common.h=42=void damon_sysfs_schemes_update_stats(\n--\nmm/damon/sysfs-common.h-45-\nmm/damon/sysfs-common.h:46:void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes,\nmm/damon/sysfs-common.h-47-\t\tstruct damon_ctx *ctx, struct damon_target *t,\n--\nmm/damon/sysfs-common.h=51=int damon_sysfs_schemes_clear_regions(\n--\nmm/damon/sysfs-common.h-53-\nmm/damon/sysfs-common.h:54:int damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,\nmm/damon/sysfs-common.h-55-\t\tstruct damon_ctx *ctx);\nmm/damon/sysfs-common.h-56-\nmm/damon/sysfs-common.h:57:void damos_sysfs_update_effective_quotas(\nmm/damon/sysfs-common.h-58-\t\tstruct damon_sysfs_schemes *sysfs_schemes,\n--\nmm/damon/sysfs-schemes.c-14-\nmm/damon/sysfs-schemes.c:15:struct damos_sysfs_probe {\nmm/damon/sysfs-schemes.c-16-\tstruct kobject kobj;\n--\nmm/damon/sysfs-schemes.c-19-\nmm/damon/sysfs-schemes.c:20:static struct damos_sysfs_probe *damos_sysfs_probe_alloc(unsigned char hits)\nmm/damon/sysfs-schemes.c-21-{\nmm/damon/sysfs-schemes.c:22:\tstruct damos_sysfs_probe *probe;\nmm/damon/sysfs-schemes.c-23-\n--\nmm/damon/sysfs-schemes.c=31=static ssize_t hits_show(struct kobject *kobj, struct kobj_attribute *attr,\n--\nmm/damon/sysfs-schemes.c-33-{\nmm/damon/sysfs-schemes.c:34:\tstruct damos_sysfs_probe *probe = container_of(kobj,\nmm/damon/sysfs-schemes.c:35:\t\t\tstruct damos_sysfs_probe, kobj);\nmm/damon/sysfs-schemes.c-36-\n--\nmm/damon/sysfs-schemes.c-39-\nmm/damon/sysfs-schemes.c:40:static void damos_sysfs_probe_release(struct kobject *kobj)\nmm/damon/sysfs-schemes.c-41-{\nmm/damon/sysfs-schemes.c:42:\tstruct damos_sysfs_probe *probe = container_of(kobj,\nmm/damon/sysfs-schemes.c:43:\t\t\tstruct damos_sysfs_probe, kobj);\nmm/damon/sysfs-schemes.c-44-\n--\nmm/damon/sysfs-schemes.c-47-\nmm/damon/sysfs-schemes.c:48:static struct kobj_attribute damos_sysfs_probe_hits_attr =\nmm/damon/sysfs-schemes.c-49-\t\t__ATTR_RO_MODE(hits, 0400);\nmm/damon/sysfs-schemes.c-50-\nmm/damon/sysfs-schemes.c:51:static struct attribute *damos_sysfs_probe_attrs[] = {\nmm/damon/sysfs-schemes.c:52:\t\u0026damos_sysfs_probe_hits_attr.attr,\nmm/damon/sysfs-schemes.c-53-\tNULL,\nmm/damon/sysfs-schemes.c-54-};\nmm/damon/sysfs-schemes.c:55:ATTRIBUTE_GROUPS(damos_sysfs_probe);\nmm/damon/sysfs-schemes.c-56-\nmm/damon/sysfs-schemes.c:57:static const struct kobj_type damos_sysfs_probe_ktype = {\nmm/damon/sysfs-schemes.c:58:\t.release = damos_sysfs_probe_release,\nmm/damon/sysfs-schemes.c-59-\t.sysfs_ops = \u0026kobj_sysfs_ops,\nmm/damon/sysfs-schemes.c:60:\t.default_groups = damos_sysfs_probe_groups,\nmm/damon/sysfs-schemes.c-61-};\n--\nmm/damon/sysfs-schemes.c-66-\nmm/damon/sysfs-schemes.c:67:struct damos_sysfs_probes {\nmm/damon/sysfs-schemes.c-68-\tstruct kobject kobj;\nmm/damon/sysfs-schemes.c:69:\tstruct damos_sysfs_probe **probes_arr;\nmm/damon/sysfs-schemes.c-70-\tint nr;\n--\nmm/damon/sysfs-schemes.c-72-\nmm/damon/sysfs-schemes.c:73:static struct damos_sysfs_probes *damos_sysfs_probes_alloc(void)\nmm/damon/sysfs-schemes.c-74-{\nmm/damon/sysfs-schemes.c:75:\treturn kzalloc_obj(struct damos_sysfs_probes);\nmm/damon/sysfs-schemes.c-76-}\nmm/damon/sysfs-schemes.c-77-\nmm/damon/sysfs-schemes.c:78:static void damos_sysfs_probes_rm_dirs(struct damos_sysfs_probes *probes)\nmm/damon/sysfs-schemes.c-79-{\nmm/damon/sysfs-schemes.c:80:\tstruct damos_sysfs_probe **probes_arr = probes-\u003eprobes_arr;\nmm/damon/sysfs-schemes.c-81-\tint i;\n--\nmm/damon/sysfs-schemes.c-89-\nmm/damon/sysfs-schemes.c:90:static int damos_sysfs_probes_add_dirs(struct damos_sysfs_probes *probes,\nmm/damon/sysfs-schemes.c-91-\t\tstruct damon_ctx *ctx, struct damon_region *region)\n--\nmm/damon/sysfs-schemes.c-93-\tstruct damon_probe *probe;\nmm/damon/sysfs-schemes.c:94:\tstruct damos_sysfs_probe **probes_arr;\nmm/damon/sysfs-schemes.c-95-\tint i = 0;\n--\nmm/damon/sysfs-schemes.c-109-\tdamon_for_each_probe(probe, ctx) {\nmm/damon/sysfs-schemes.c:110:\t\tstruct damos_sysfs_probe *sys_probe;\nmm/damon/sysfs-schemes.c-111-\t\tint err;\nmm/damon/sysfs-schemes.c-112-\nmm/damon/sysfs-schemes.c:113:\t\tsys_probe = damos_sysfs_probe_alloc(\nmm/damon/sysfs-schemes.c-114-\t\t\t\tdamon_probe_hits_mvsum(i, region, ctx));\nmm/damon/sysfs-schemes.c-115-\t\tif (!sys_probe) {\nmm/damon/sysfs-schemes.c:116:\t\t\tdamos_sysfs_probes_rm_dirs(probes);\nmm/damon/sysfs-schemes.c-117-\t\t\treturn -ENOMEM;\n--\nmm/damon/sysfs-schemes.c-119-\t\terr = kobject_init_and_add(\u0026sys_probe-\u003ekobj,\nmm/damon/sysfs-schemes.c:120:\t\t\t\t\u0026damos_sysfs_probe_ktype, \u0026probes-\u003ekobj, \"%d\",\nmm/damon/sysfs-schemes.c-121-\t\t\t\ti);\n--\nmm/damon/sysfs-schemes.c-123-\t\t\tkobject_put(\u0026sys_probe-\u003ekobj);\nmm/damon/sysfs-schemes.c:124:\t\t\tdamos_sysfs_probes_rm_dirs(probes);\nmm/damon/sysfs-schemes.c-125-\t\t\treturn err;\n--\nmm/damon/sysfs-schemes.c-132-\nmm/damon/sysfs-schemes.c:133:static void damos_sysfs_probes_release(struct kobject *kobj)\nmm/damon/sysfs-schemes.c-134-{\nmm/damon/sysfs-schemes.c:135:\tstruct damos_sysfs_probes *probes = container_of(kobj,\nmm/damon/sysfs-schemes.c:136:\t\t\tstruct damos_sysfs_probes, kobj);\nmm/damon/sysfs-schemes.c-137-\n--\nmm/damon/sysfs-schemes.c-140-\nmm/damon/sysfs-schemes.c:141:static const struct kobj_type damos_sysfs_probes_ktype = {\nmm/damon/sysfs-schemes.c:142:\t.release = damos_sysfs_probes_release,\nmm/damon/sysfs-schemes.c-143-\t.sysfs_ops = \u0026kobj_sysfs_ops,\n--\nmm/damon/sysfs-schemes.c=150=struct damon_sysfs_scheme_region {\n--\nmm/damon/sysfs-schemes.c-155-\tunsigned long sz_filter_passed;\nmm/damon/sysfs-schemes.c:156:\tstruct damos_sysfs_probes *probes;\nmm/damon/sysfs-schemes.c-157-\tstruct list_head list;\n--\nmm/damon/sysfs-schemes.c=160=static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc(\n--\nmm/damon/sysfs-schemes.c-175-\nmm/damon/sysfs-schemes.c:176:static int damos_sysfs_region_add_dirs(\nmm/damon/sysfs-schemes.c-177-\t\tstruct damon_sysfs_scheme_region *region,\n--\nmm/damon/sysfs-schemes.c-180-{\nmm/damon/sysfs-schemes.c:181:\tstruct damos_sysfs_probes *probes = damos_sysfs_probes_alloc();\nmm/damon/sysfs-schemes.c-182-\tint err;\n--\nmm/damon/sysfs-schemes.c-185-\t\treturn -ENOMEM;\nmm/damon/sysfs-schemes.c:186:\terr = kobject_init_and_add(\u0026probes-\u003ekobj, \u0026damos_sysfs_probes_ktype,\nmm/damon/sysfs-schemes.c-187-\t\t\t\u0026region-\u003ekobj, \"probes\");\n--\nmm/damon/sysfs-schemes.c-189-\t\tgoto fail;\nmm/damon/sysfs-schemes.c:190:\terr = damos_sysfs_probes_add_dirs(probes, ctx, dregion);\nmm/damon/sysfs-schemes.c-191-\tif (err)\n--\nmm/damon/sysfs-schemes.c-201-\nmm/damon/sysfs-schemes.c:202:static void damos_sysfs_region_rm_dirs(\nmm/damon/sysfs-schemes.c-203-\t\tstruct damon_sysfs_scheme_region *region)\nmm/damon/sysfs-schemes.c-204-{\nmm/damon/sysfs-schemes.c:205:\tdamos_sysfs_probes_rm_dirs(region-\u003eprobes);\nmm/damon/sysfs-schemes.c-206-\tkobject_put(\u0026region-\u003eprobes-\u003ekobj);\n--\nmm/damon/sysfs-schemes.c=328=static void damon_sysfs_scheme_regions_rm_dirs(\n--\nmm/damon/sysfs-schemes.c-333-\tlist_for_each_entry_safe(r, next, \u0026regions-\u003eregions_list, list) {\nmm/damon/sysfs-schemes.c:334:\t\tdamos_sysfs_region_rm_dirs(r);\nmm/damon/sysfs-schemes.c-335-\t\tlist_del(\u0026r-\u003elist);\n--\nmm/damon/sysfs-schemes.c=510=static const struct kobj_type damon_sysfs_stats_ktype = {\n--\nmm/damon/sysfs-schemes.c-520-/*\nmm/damon/sysfs-schemes.c:521: * enum damos_sysfs_filter_handle_layer - Layers handling filters of a dir.\nmm/damon/sysfs-schemes.c-522- */\nmm/damon/sysfs-schemes.c:523:enum damos_sysfs_filter_handle_layer {\nmm/damon/sysfs-schemes.c-524-\tDAMOS_SYSFS_FILTER_HANDLE_LAYER_CORE,\n--\nmm/damon/sysfs-schemes.c=529=struct damon_sysfs_scheme_filter {\nmm/damon/sysfs-schemes.c-530-\tstruct kobject kobj;\nmm/damon/sysfs-schemes.c:531:\tenum damos_sysfs_filter_handle_layer handle_layer;\nmm/damon/sysfs-schemes.c-532-\tenum damos_filter_type type;\n--\nmm/damon/sysfs-schemes.c=541=static struct damon_sysfs_scheme_filter *damon_sysfs_scheme_filter_alloc(\nmm/damon/sysfs-schemes.c:542:\t\tenum damos_sysfs_filter_handle_layer layer)\nmm/damon/sysfs-schemes.c-543-{\n--\nmm/damon/sysfs-schemes.c-551-\nmm/damon/sysfs-schemes.c:552:struct damos_sysfs_filter_type_name {\nmm/damon/sysfs-schemes.c-553-\tenum damos_filter_type type;\n--\nmm/damon/sysfs-schemes.c-556-\nmm/damon/sysfs-schemes.c:557:static const struct damos_sysfs_filter_type_name\nmm/damon/sysfs-schemes.c:558:damos_sysfs_filter_type_names[] = {\nmm/damon/sysfs-schemes.c-559-\t{\n--\nmm/damon/sysfs-schemes.c=593=static ssize_t type_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-599-\nmm/damon/sysfs-schemes.c:600:\tfor (i = 0; i \u003c ARRAY_SIZE(damos_sysfs_filter_type_names); i++) {\nmm/damon/sysfs-schemes.c:601:\t\tconst struct damos_sysfs_filter_type_name *type_name;\nmm/damon/sysfs-schemes.c-602-\nmm/damon/sysfs-schemes.c:603:\t\ttype_name = \u0026damos_sysfs_filter_type_names[i];\nmm/damon/sysfs-schemes.c-604-\t\tif (type_name-\u003etype == filter-\u003etype)\n--\nmm/damon/sysfs-schemes.c-609-\nmm/damon/sysfs-schemes.c:610:static bool damos_sysfs_scheme_filter_valid_type(\nmm/damon/sysfs-schemes.c:611:\t\tenum damos_sysfs_filter_handle_layer layer,\nmm/damon/sysfs-schemes.c-612-\t\tenum damos_filter_type type)\n--\nmm/damon/sysfs-schemes.c=627=static ssize_t type_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-634-\nmm/damon/sysfs-schemes.c:635:\tfor (i = 0; i \u003c ARRAY_SIZE(damos_sysfs_filter_type_names); i++) {\nmm/damon/sysfs-schemes.c:636:\t\tconst struct damos_sysfs_filter_type_name *type_name;\nmm/damon/sysfs-schemes.c-637-\nmm/damon/sysfs-schemes.c:638:\t\ttype_name = \u0026damos_sysfs_filter_type_names[i];\nmm/damon/sysfs-schemes.c-639-\t\tif (sysfs_streq(buf, type_name-\u003ename)) {\nmm/damon/sysfs-schemes.c:640:\t\t\tif (!damos_sysfs_scheme_filter_valid_type(\nmm/damon/sysfs-schemes.c-641-\t\t\t\t\t\tfilter-\u003ehandle_layer,\n--\nmm/damon/sysfs-schemes.c=892=struct damon_sysfs_scheme_filters {\nmm/damon/sysfs-schemes.c-893-\tstruct kobject kobj;\nmm/damon/sysfs-schemes.c:894:\tenum damos_sysfs_filter_handle_layer handle_layer;\nmm/damon/sysfs-schemes.c-895-\tstruct damon_sysfs_scheme_filter **filters_arr;\n--\nmm/damon/sysfs-schemes.c=899=static struct damon_sysfs_scheme_filters *\nmm/damon/sysfs-schemes.c:900:damon_sysfs_scheme_filters_alloc(enum damos_sysfs_filter_handle_layer layer)\nmm/damon/sysfs-schemes.c-901-{\n--\nmm/damon/sysfs-schemes.c=1029=static struct damon_sysfs_watermarks *damon_sysfs_watermarks_alloc(\n--\nmm/damon/sysfs-schemes.c-1045-\nmm/damon/sysfs-schemes.c:1046:struct damos_sysfs_wmark_metric_name {\nmm/damon/sysfs-schemes.c-1047-\tenum damos_wmark_metric metric;\n--\nmm/damon/sysfs-schemes.c-1050-\nmm/damon/sysfs-schemes.c:1051:static const struct damos_sysfs_wmark_metric_name\nmm/damon/sysfs-schemes.c:1052:damos_sysfs_wmark_metric_names[] = {\nmm/damon/sysfs-schemes.c-1053-\t{\n--\nmm/damon/sysfs-schemes.c=1063=static ssize_t metric_show(struct kobject *kobj, struct kobj_attribute *attr,\n--\nmm/damon/sysfs-schemes.c-1069-\nmm/damon/sysfs-schemes.c:1070:\tfor (i = 0; i \u003c ARRAY_SIZE(damos_sysfs_wmark_metric_names); i++) {\nmm/damon/sysfs-schemes.c:1071:\t\tconst struct damos_sysfs_wmark_metric_name *metric_name;\nmm/damon/sysfs-schemes.c-1072-\nmm/damon/sysfs-schemes.c:1073:\t\tmetric_name = \u0026damos_sysfs_wmark_metric_names[i];\nmm/damon/sysfs-schemes.c-1074-\t\tif (metric_name-\u003emetric == watermarks-\u003emetric)\n--\nmm/damon/sysfs-schemes.c=1080=static ssize_t metric_store(struct kobject *kobj, struct kobj_attribute *attr,\n--\nmm/damon/sysfs-schemes.c-1086-\nmm/damon/sysfs-schemes.c:1087:\tfor (i = 0; i \u003c ARRAY_SIZE(damos_sysfs_wmark_metric_names); i++) {\nmm/damon/sysfs-schemes.c:1088:\t\tconst struct damos_sysfs_wmark_metric_name *metric_name;\nmm/damon/sysfs-schemes.c-1089-\nmm/damon/sysfs-schemes.c:1090:\t\tmetric_name = \u0026damos_sysfs_wmark_metric_names[i];\nmm/damon/sysfs-schemes.c-1091-\t\tif (sysfs_streq(buf, metric_name-\u003ename)) {\n--\nmm/damon/sysfs-schemes.c=1205=static const struct kobj_type damon_sysfs_watermarks_ktype = {\n--\nmm/damon/sysfs-schemes.c-1214-\nmm/damon/sysfs-schemes.c:1215:struct damos_sysfs_quota_goal {\nmm/damon/sysfs-schemes.c-1216-\tstruct kobject kobj;\n--\nmm/damon/sysfs-schemes.c-1223-\nmm/damon/sysfs-schemes.c:1224:static struct damos_sysfs_quota_goal *damos_sysfs_quota_goal_alloc(void)\nmm/damon/sysfs-schemes.c-1225-{\nmm/damon/sysfs-schemes.c:1226:\treturn kzalloc_obj(struct damos_sysfs_quota_goal);\nmm/damon/sysfs-schemes.c-1227-}\nmm/damon/sysfs-schemes.c-1228-\nmm/damon/sysfs-schemes.c:1229:struct damos_sysfs_qgoal_metric_name {\nmm/damon/sysfs-schemes.c-1230-\tenum damos_quota_goal_metric metric;\n--\nmm/damon/sysfs-schemes.c=1234=static\nmm/damon/sysfs-schemes.c:1235:struct damos_sysfs_qgoal_metric_name damos_sysfs_qgoal_metric_names[] = {\nmm/damon/sysfs-schemes.c-1236-\t{\n--\nmm/damon/sysfs-schemes.c=1278=static ssize_t target_metric_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1280-{\nmm/damon/sysfs-schemes.c:1281:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1282:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1283-\tint i;\nmm/damon/sysfs-schemes.c-1284-\nmm/damon/sysfs-schemes.c:1285:\tfor (i = 0; i \u003c ARRAY_SIZE(damos_sysfs_qgoal_metric_names); i++) {\nmm/damon/sysfs-schemes.c:1286:\t\tstruct damos_sysfs_qgoal_metric_name *metric_name;\nmm/damon/sysfs-schemes.c-1287-\nmm/damon/sysfs-schemes.c:1288:\t\tmetric_name = \u0026damos_sysfs_qgoal_metric_names[i];\nmm/damon/sysfs-schemes.c-1289-\t\tif (metric_name-\u003emetric == goal-\u003emetric)\n--\nmm/damon/sysfs-schemes.c=1295=static ssize_t target_metric_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1297-{\nmm/damon/sysfs-schemes.c:1298:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1299:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1300-\tint i;\nmm/damon/sysfs-schemes.c-1301-\nmm/damon/sysfs-schemes.c:1302:\tfor (i = 0; i \u003c ARRAY_SIZE(damos_sysfs_qgoal_metric_names); i++) {\nmm/damon/sysfs-schemes.c:1303:\t\tstruct damos_sysfs_qgoal_metric_name *metric_name;\nmm/damon/sysfs-schemes.c-1304-\nmm/damon/sysfs-schemes.c:1305:\t\tmetric_name = \u0026damos_sysfs_qgoal_metric_names[i];\nmm/damon/sysfs-schemes.c-1306-\t\tif (sysfs_streq(buf, metric_name-\u003ename)) {\n--\nmm/damon/sysfs-schemes.c=1314=static ssize_t target_value_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1316-{\nmm/damon/sysfs-schemes.c:1317:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1318:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1319-\n--\nmm/damon/sysfs-schemes.c=1323=static ssize_t target_value_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1325-{\nmm/damon/sysfs-schemes.c:1326:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1327:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1328-\tint err = kstrtoul(buf, 0, \u0026goal-\u003etarget_value);\n--\nmm/damon/sysfs-schemes.c=1333=static ssize_t current_value_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1335-{\nmm/damon/sysfs-schemes.c:1336:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1337:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1338-\n--\nmm/damon/sysfs-schemes.c=1342=static ssize_t current_value_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1344-{\nmm/damon/sysfs-schemes.c:1345:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1346:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1347-\tint err = kstrtoul(buf, 0, \u0026goal-\u003ecurrent_value);\n--\nmm/damon/sysfs-schemes.c=1353=static ssize_t nid_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1355-{\nmm/damon/sysfs-schemes.c:1356:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1357:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1358-\n--\nmm/damon/sysfs-schemes.c=1363=static ssize_t nid_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1365-{\nmm/damon/sysfs-schemes.c:1366:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1367:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1368-\tint err = kstrtoint(buf, 0, \u0026goal-\u003enid);\n--\nmm/damon/sysfs-schemes.c=1374=static ssize_t path_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1376-{\nmm/damon/sysfs-schemes.c:1377:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1378:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1379-\tint len;\n--\nmm/damon/sysfs-schemes.c=1388=static ssize_t path_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1390-{\nmm/damon/sysfs-schemes.c:1391:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1392:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1393-\tchar *path = kmalloc_array(size_add(count, 1), sizeof(*path),\n--\nmm/damon/sysfs-schemes.c-1409-\nmm/damon/sysfs-schemes.c:1410:static void damos_sysfs_quota_goal_release(struct kobject *kobj)\nmm/damon/sysfs-schemes.c-1411-{\nmm/damon/sysfs-schemes.c:1412:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1413:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1414-\n--\nmm/damon/sysfs-schemes.c-1418-\nmm/damon/sysfs-schemes.c:1419:static struct kobj_attribute damos_sysfs_quota_goal_target_metric_attr =\nmm/damon/sysfs-schemes.c-1420-\t\t__ATTR_RW_MODE(target_metric, 0600);\nmm/damon/sysfs-schemes.c-1421-\nmm/damon/sysfs-schemes.c:1422:static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr =\nmm/damon/sysfs-schemes.c-1423-\t\t__ATTR_RW_MODE(target_value, 0600);\nmm/damon/sysfs-schemes.c-1424-\nmm/damon/sysfs-schemes.c:1425:static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr =\nmm/damon/sysfs-schemes.c-1426-\t\t__ATTR_RW_MODE(current_value, 0600);\nmm/damon/sysfs-schemes.c-1427-\nmm/damon/sysfs-schemes.c:1428:static struct kobj_attribute damos_sysfs_quota_goal_nid_attr =\nmm/damon/sysfs-schemes.c-1429-\t\t__ATTR_RW_MODE(nid, 0600);\nmm/damon/sysfs-schemes.c-1430-\nmm/damon/sysfs-schemes.c:1431:static struct kobj_attribute damos_sysfs_quota_goal_path_attr =\nmm/damon/sysfs-schemes.c-1432-\t\t__ATTR_RW_MODE(path, 0600);\nmm/damon/sysfs-schemes.c-1433-\nmm/damon/sysfs-schemes.c:1434:static struct attribute *damos_sysfs_quota_goal_attrs[] = {\nmm/damon/sysfs-schemes.c:1435:\t\u0026damos_sysfs_quota_goal_target_metric_attr.attr,\nmm/damon/sysfs-schemes.c:1436:\t\u0026damos_sysfs_quota_goal_target_value_attr.attr,\nmm/damon/sysfs-schemes.c:1437:\t\u0026damos_sysfs_quota_goal_current_value_attr.attr,\nmm/damon/sysfs-schemes.c:1438:\t\u0026damos_sysfs_quota_goal_nid_attr.attr,\nmm/damon/sysfs-schemes.c:1439:\t\u0026damos_sysfs_quota_goal_path_attr.attr,\nmm/damon/sysfs-schemes.c-1440-\tNULL,\nmm/damon/sysfs-schemes.c-1441-};\nmm/damon/sysfs-schemes.c:1442:ATTRIBUTE_GROUPS(damos_sysfs_quota_goal);\nmm/damon/sysfs-schemes.c-1443-\nmm/damon/sysfs-schemes.c:1444:static const struct kobj_type damos_sysfs_quota_goal_ktype = {\nmm/damon/sysfs-schemes.c:1445:\t.release = damos_sysfs_quota_goal_release,\nmm/damon/sysfs-schemes.c-1446-\t.sysfs_ops = \u0026kobj_sysfs_ops,\nmm/damon/sysfs-schemes.c:1447:\t.default_groups = damos_sysfs_quota_goal_groups,\nmm/damon/sysfs-schemes.c-1448-};\n--\nmm/damon/sysfs-schemes.c-1453-\nmm/damon/sysfs-schemes.c:1454:struct damos_sysfs_quota_goals {\nmm/damon/sysfs-schemes.c-1455-\tstruct kobject kobj;\nmm/damon/sysfs-schemes.c:1456:\tstruct damos_sysfs_quota_goal **goals_arr;\t/* counted by nr */\nmm/damon/sysfs-schemes.c-1457-\tint nr;\n--\nmm/damon/sysfs-schemes.c-1459-\nmm/damon/sysfs-schemes.c:1460:static struct damos_sysfs_quota_goals *damos_sysfs_quota_goals_alloc(void)\nmm/damon/sysfs-schemes.c-1461-{\nmm/damon/sysfs-schemes.c:1462:\treturn kzalloc_obj(struct damos_sysfs_quota_goals);\nmm/damon/sysfs-schemes.c-1463-}\nmm/damon/sysfs-schemes.c-1464-\nmm/damon/sysfs-schemes.c:1465:static void damos_sysfs_quota_goals_rm_dirs(\nmm/damon/sysfs-schemes.c:1466:\t\tstruct damos_sysfs_quota_goals *goals)\nmm/damon/sysfs-schemes.c-1467-{\nmm/damon/sysfs-schemes.c:1468:\tstruct damos_sysfs_quota_goal **goals_arr = goals-\u003egoals_arr;\nmm/damon/sysfs-schemes.c-1469-\tint i;\n--\nmm/damon/sysfs-schemes.c-1479-\nmm/damon/sysfs-schemes.c:1480:static int damos_sysfs_quota_goals_add_dirs(\nmm/damon/sysfs-schemes.c:1481:\t\tstruct damos_sysfs_quota_goals *goals, int nr_goals)\nmm/damon/sysfs-schemes.c-1482-{\nmm/damon/sysfs-schemes.c:1483:\tstruct damos_sysfs_quota_goal **goals_arr, *goal;\nmm/damon/sysfs-schemes.c-1484-\tint err, i;\nmm/damon/sysfs-schemes.c-1485-\nmm/damon/sysfs-schemes.c:1486:\tdamos_sysfs_quota_goals_rm_dirs(goals);\nmm/damon/sysfs-schemes.c-1487-\tif (!nr_goals)\n--\nmm/damon/sysfs-schemes.c-1496-\tfor (i = 0; i \u003c nr_goals; i++) {\nmm/damon/sysfs-schemes.c:1497:\t\tgoal = damos_sysfs_quota_goal_alloc();\nmm/damon/sysfs-schemes.c-1498-\t\tif (!goal) {\nmm/damon/sysfs-schemes.c:1499:\t\t\tdamos_sysfs_quota_goals_rm_dirs(goals);\nmm/damon/sysfs-schemes.c-1500-\t\t\treturn -ENOMEM;\n--\nmm/damon/sysfs-schemes.c-1503-\t\terr = kobject_init_and_add(\u0026goal-\u003ekobj,\nmm/damon/sysfs-schemes.c:1504:\t\t\t\t\u0026damos_sysfs_quota_goal_ktype, \u0026goals-\u003ekobj,\nmm/damon/sysfs-schemes.c-1505-\t\t\t\t\"%d\", i);\n--\nmm/damon/sysfs-schemes.c-1507-\t\t\tkobject_put(\u0026goal-\u003ekobj);\nmm/damon/sysfs-schemes.c:1508:\t\t\tdamos_sysfs_quota_goals_rm_dirs(goals);\nmm/damon/sysfs-schemes.c-1509-\t\t\treturn err;\n--\nmm/damon/sysfs-schemes.c=1518=static ssize_t nr_goals_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1520-{\nmm/damon/sysfs-schemes.c:1521:\tstruct damos_sysfs_quota_goals *goals = container_of(kobj,\nmm/damon/sysfs-schemes.c:1522:\t\t\tstruct damos_sysfs_quota_goals, kobj);\nmm/damon/sysfs-schemes.c-1523-\n--\nmm/damon/sysfs-schemes.c=1527=static ssize_t nr_goals_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1529-{\nmm/damon/sysfs-schemes.c:1530:\tstruct damos_sysfs_quota_goals *goals;\nmm/damon/sysfs-schemes.c-1531-\tint nr, err = kstrtoint(buf, 0, \u0026nr);\n--\nmm/damon/sysfs-schemes.c-1537-\nmm/damon/sysfs-schemes.c:1538:\tgoals = container_of(kobj, struct damos_sysfs_quota_goals, kobj);\nmm/damon/sysfs-schemes.c-1539-\n--\nmm/damon/sysfs-schemes.c-1541-\t\treturn -EBUSY;\nmm/damon/sysfs-schemes.c:1542:\terr = damos_sysfs_quota_goals_add_dirs(goals, nr);\nmm/damon/sysfs-schemes.c-1543-\tmutex_unlock(\u0026damon_sysfs_lock);\n--\nmm/damon/sysfs-schemes.c-1549-\nmm/damon/sysfs-schemes.c:1550:static void damos_sysfs_quota_goals_release(struct kobject *kobj)\nmm/damon/sysfs-schemes.c-1551-{\nmm/damon/sysfs-schemes.c:1552:\tkfree(container_of(kobj, struct damos_sysfs_quota_goals, kobj));\nmm/damon/sysfs-schemes.c-1553-}\nmm/damon/sysfs-schemes.c-1554-\nmm/damon/sysfs-schemes.c:1555:static struct kobj_attribute damos_sysfs_quota_goals_nr_attr =\nmm/damon/sysfs-schemes.c-1556-\t\t__ATTR_RW_MODE(nr_goals, 0600);\nmm/damon/sysfs-schemes.c-1557-\nmm/damon/sysfs-schemes.c:1558:static struct attribute *damos_sysfs_quota_goals_attrs[] = {\nmm/damon/sysfs-schemes.c:1559:\t\u0026damos_sysfs_quota_goals_nr_attr.attr,\nmm/damon/sysfs-schemes.c-1560-\tNULL,\nmm/damon/sysfs-schemes.c-1561-};\nmm/damon/sysfs-schemes.c:1562:ATTRIBUTE_GROUPS(damos_sysfs_quota_goals);\nmm/damon/sysfs-schemes.c-1563-\nmm/damon/sysfs-schemes.c:1564:static const struct kobj_type damos_sysfs_quota_goals_ktype = {\nmm/damon/sysfs-schemes.c:1565:\t.release = damos_sysfs_quota_goals_release,\nmm/damon/sysfs-schemes.c-1566-\t.sysfs_ops = \u0026kobj_sysfs_ops,\nmm/damon/sysfs-schemes.c:1567:\t.default_groups = damos_sysfs_quota_goals_groups,\nmm/damon/sysfs-schemes.c-1568-};\n--\nmm/damon/sysfs-schemes.c=1684=struct damon_sysfs_quotas {\n--\nmm/damon/sysfs-schemes.c-1686-\tstruct damon_sysfs_weights *weights;\nmm/damon/sysfs-schemes.c:1687:\tstruct damos_sysfs_quota_goals *goals;\nmm/damon/sysfs-schemes.c-1688-\tunsigned long ms;\n--\nmm/damon/sysfs-schemes.c=1702=static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas)\n--\nmm/damon/sysfs-schemes.c-1704-\tstruct damon_sysfs_weights *weights;\nmm/damon/sysfs-schemes.c:1705:\tstruct damos_sysfs_quota_goals *goals;\nmm/damon/sysfs-schemes.c-1706-\tint err;\n--\nmm/damon/sysfs-schemes.c-1719-\nmm/damon/sysfs-schemes.c:1720:\tgoals = damos_sysfs_quota_goals_alloc();\nmm/damon/sysfs-schemes.c-1721-\tif (!goals) {\n--\nmm/damon/sysfs-schemes.c-1725-\terr = kobject_init_and_add(\u0026goals-\u003ekobj,\nmm/damon/sysfs-schemes.c:1726:\t\t\t\u0026damos_sysfs_quota_goals_ktype, \u0026quotas-\u003ekobj,\nmm/damon/sysfs-schemes.c-1727-\t\t\t\"goals\");\n--\nmm/damon/sysfs-schemes.c=1738=static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas)\n--\nmm/damon/sysfs-schemes.c-1740-\tkobject_put(\u0026quotas-\u003eweights-\u003ekobj);\nmm/damon/sysfs-schemes.c:1741:\tdamos_sysfs_quota_goals_rm_dirs(quotas-\u003egoals);\nmm/damon/sysfs-schemes.c-1742-\tkobject_put(\u0026quotas-\u003egoals-\u003ekobj);\n--\nmm/damon/sysfs-schemes.c=1808=static ssize_t effective_bytes_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1816-\nmm/damon/sysfs-schemes.c:1817:struct damos_sysfs_qgoal_tuner_name {\nmm/damon/sysfs-schemes.c-1818-\tenum damos_quota_goal_tuner tuner;\n--\nmm/damon/sysfs-schemes.c-1821-\nmm/damon/sysfs-schemes.c:1822:static struct damos_sysfs_qgoal_tuner_name damos_sysfs_qgoal_tuner_names[] = {\nmm/damon/sysfs-schemes.c-1823-\t{\n--\nmm/damon/sysfs-schemes.c=1833=static ssize_t goal_tuner_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1839-\nmm/damon/sysfs-schemes.c:1840:\tfor (i = 0; i \u003c ARRAY_SIZE(damos_sysfs_qgoal_tuner_names); i++) {\n\n"
}
19/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 30312
							output: 37
							thoughts: 855

Thoughts: 
**Analyzing the `damos_set_effective_quota` Function**

Okay, let's break this down. I'm focusing on the `damos_set_effective_quota` function in `mm/damon/core.c` and how this specific change impacts its logic. First, I need to understand the flow. Essentially, the function calculates an effective quota size (`esz`) based on several factors tied to the `damos` structure and its associated `quota`.

Initially, if neither `quota->ms` is set *and* the goal list is empty, then `esz` simply defaults to `quota->sz`, which makes sense.  Now, if there *are* goals set, it uses one of the goal tuners (temporal or consistent) to adjust `esz_bp`. The key point is: if the goal tuning logic sets `quota->esz_bp` to 0 (which I recall from my previous understanding is quite possible, especially with `score >= 10000`), then the original code had a subtle flaw.

Here's where it got interesting.  Even if `esz_bp` was zero due to goal tuning, if `quota->ms` was subsequently set, the code would calculate `esz` as the minimum of some throughput value multiplied by `quota->ms`, *and* the (now zero) `esz` value.  Of course, the minimum of 0 and anything is 0. However, the next line `esz = max(ctx->min_region_sz, esz);` would then set `esz` to `ctx->min_region_sz`.  So, you'd end up with a non-zero `esz` even though goal tuning had deliberately zeroed out `esz_bp`.

The new check `if (!quota->esz_bp) esz = 0;` addresses this.  It *forces* `esz` to zero when `esz_bp` is zero, which is the intended behavior based on the goal tuning. Previously, the `max` function was effectively overriding the zero value.

I also need to consider the case where `quota->goals` is empty, but `quota->ms` *is* set.  I know `damos_quota_init` sets `quota->esz_bp = 0` during initialization. So, the condition `!quota->ms && list_empty(&quota->goals)` is false.  In the `damos_set_effective_quota` function, if `!list_empty(&quota->goals)` is false, it means we don't use goal tuning.  Thus, `esz` would remain uninitialized.  (Hang on, I need to check the initialization logic for the case where `list_empty(&quota->goals)` and `quota->ms != 0`! Let me review those lines...)

20/2 2026/09/02 23:42 tool read-file
0m Args: 
{
  "File": "mm/damon/core.c",
  "FirstLine": 3220,
  "LineCount": 40
}

Results: 
{
  "Contents": "3220:\t * Called only if quota-\u003ems, or quota-\u003esz are set, or quota-\u003egoals is not empty\n3221:\t */\n3222:\tstatic void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)\n3223:\t{\n3224:\t\tstruct damos_quota *quota = \u0026s-\u003equota;\n3225:\t\tunsigned long throughput;\n3226:\t\tunsigned long esz = ULONG_MAX;\n3227:\t\n3228:\t\tif (!quota-\u003ems \u0026\u0026 list_empty(\u0026quota-\u003egoals)) {\n3229:\t\t\tquota-\u003eesz = quota-\u003esz;\n3230:\t\t\treturn;\n3231:\t\t}\n3232:\t\n3233:\t\tif (!list_empty(\u0026quota-\u003egoals)) {\n3234:\t\t\tif (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_CONSIST)\n3235:\t\t\t\tdamos_goal_tune_esz_bp_consist(ctx, s);\n3236:\t\t\telse if (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_TEMPORAL)\n3237:\t\t\t\tdamos_goal_tune_esz_bp_temporal(ctx, s);\n3238:\t\t\tesz = quota-\u003eesz_bp / 10000;\n3239:\t\t}\n3240:\t\n3241:\t\tif (quota-\u003ems) {\n3242:\t\t\tif (quota-\u003etotal_charged_ns)\n3243:\t\t\t\tthroughput = mult_frac(quota-\u003etotal_charged_sz,\n3244:\t\t\t\t\t\t1000000, quota-\u003etotal_charged_ns);\n3245:\t\t\telse\n3246:\t\t\t\tthroughput = PAGE_SIZE * 1024;\n3247:\t\t\tesz = min(throughput * quota-\u003ems, esz);\n3248:\t\t\tesz = max(ctx-\u003emin_region_sz, esz);\n3249:\t\t}\n3250:\t\n3251:\t\tif (quota-\u003esz \u0026\u0026 quota-\u003esz \u003c esz)\n3252:\t\t\tesz = quota-\u003esz;\n3253:\t\n3254:\t\tif (!quota-\u003eesz_bp)\n3255:\t\t\tesz = 0;\n3256:\t\n3257:\t\tquota-\u003eesz = esz;\n3258:\t}\n3259:\t\n"
}
21/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 32444
							output: 29
							thoughts: 340

Thoughts: 
**My Assessment of a DAMON Core Logic Change**

Okay, so I've spotted something interesting. It looks like when `quota->goals` is empty, `quota->esz_bp` stays at zero. That's fine, but then the code goes on to check `if (!quota->esz_bp) esz = 0;`. This means if someone defines a time quota (`quota->ms`) but *doesn't* set any goals, the effective scheme size (`quota->esz`) gets set to zero! This is definitely a functional change in the core memory management DAMON framework.

The question now is, is this worth serious attention? First, let's see if we can trigger this condition in a test environment.

Yes, DAMON's sysfs interface (`/sys/kernel/mm/damon/admin/...`) *is* accessible from userspace within standard virtual machines like QEMU. That's good news. And DAMON reclaim, the LRU sort, and the sysfs schemes are all reachable in user space and are tested already.

Therefore, because:

*   It directly alters kernel logic in `mm/damon/core.c` (that's core DAMON code)
*   It's reachable in virtualized environments like QEMU.
*   It modifies how the `esz` value (effective scheme size quota) is calculated

I conclude that `WorthFuzzing = true`. We should investigate this further.

Now, let's figure out the best fuzzing strategy. We need to identify relevant:

1.  `FocusSymbols`
2.  `EnableConfigs`

My next step is to examine the code in `mm/damon/` and look for entry points, exported symbols, non-static functions, and key functions to fuzz. We'll concentrate on the non-static functions in `mm/damon/` and the sysfs interfaces.

22/2 2026/09/02 23:42 tool grepper
0m Args: 
{
  "Expression": "damos_.*quota",
  "PathPrefix": "mm/damon"
}

Results: 
{
  "Output": "\nFull output is too long, showing 500 out of 810 lines.\nUse more precise expression if possible.\n\nmm/damon/core.c=683=void damos_destroy_filter(struct damos_filter *f)\n--\nmm/damon/core.c-688-\nmm/damon/core.c:689:struct damos_quota_goal *damos_new_quota_goal(\nmm/damon/core.c:690:\t\tenum damos_quota_goal_metric metric,\nmm/damon/core.c-691-\t\tunsigned long target_value)\nmm/damon/core.c-692-{\nmm/damon/core.c:693:\tstruct damos_quota_goal *goal;\nmm/damon/core.c-694-\n--\nmm/damon/core.c-705-\nmm/damon/core.c:706:void damos_add_quota_goal(struct damos_quota *q, struct damos_quota_goal *g)\nmm/damon/core.c-707-{\n--\nmm/damon/core.c-710-\nmm/damon/core.c:711:static void damos_del_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-712-{\n--\nmm/damon/core.c-715-\nmm/damon/core.c:716:static void damos_free_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-717-{\n--\nmm/damon/core.c-720-\nmm/damon/core.c:721:void damos_destroy_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-722-{\nmm/damon/core.c:723:\tdamos_del_quota_goal(g);\nmm/damon/core.c:724:\tdamos_free_quota_goal(g);\nmm/damon/core.c-725-}\nmm/damon/core.c-726-\nmm/damon/core.c:727:static bool damos_quota_goals_empty(struct damos_quota *q)\nmm/damon/core.c-728-{\n--\nmm/damon/core.c-732-/* initialize fields of @quota that normally API users wouldn't set */\nmm/damon/core.c:733:static struct damos_quota *damos_quota_init(struct damos_quota *quota)\nmm/damon/core.c-734-{\n--\nmm/damon/core.c=746=struct damos *damon_new_scheme(struct damos_access_pattern *pattern,\n--\nmm/damon/core.c-748-\t\t\tunsigned long apply_interval_us,\nmm/damon/core.c:749:\t\t\tstruct damos_quota *quota,\nmm/damon/core.c-750-\t\t\tstruct damos_watermarks *wmarks,\n--\nmm/damon/core.c-774-\nmm/damon/core.c:775:\tscheme-\u003equota = *(damos_quota_init(quota));\nmm/damon/core.c-776-\t/* quota.goals should be separately set by caller */\n--\nmm/damon/core.c=815=void damon_destroy_scheme(struct damos *s)\nmm/damon/core.c-816-{\nmm/damon/core.c:817:\tstruct damos_quota_goal *g, *g_next;\nmm/damon/core.c-818-\tstruct damos_filter *f, *next;\nmm/damon/core.c-819-\nmm/damon/core.c:820:\tdamos_for_each_quota_goal_safe(g, g_next, \u0026s-\u003equota)\nmm/damon/core.c:821:\t\tdamos_destroy_quota_goal(g);\nmm/damon/core.c-822-\n--\nmm/damon/core.c=1166=void damon_set_schemes(struct damon_ctx *ctx, struct damos **schemes,\n--\nmm/damon/core.c-1177-\nmm/damon/core.c:1178:static struct damos_quota_goal *damos_nth_quota_goal(\nmm/damon/core.c:1179:\t\tint n, struct damos_quota *q)\nmm/damon/core.c-1180-{\nmm/damon/core.c:1181:\tstruct damos_quota_goal *goal;\nmm/damon/core.c-1182-\tint i = 0;\nmm/damon/core.c-1183-\nmm/damon/core.c:1184:\tdamos_for_each_quota_goal(goal, q) {\nmm/damon/core.c-1185-\t\tif (i++ == n)\n--\nmm/damon/core.c-1190-\nmm/damon/core.c:1191:static void damos_commit_quota_goal_union(\nmm/damon/core.c:1192:\t\tstruct damos_quota_goal *dst, struct damos_quota_goal *src)\nmm/damon/core.c-1193-{\n--\nmm/damon/core.c-1214-\nmm/damon/core.c:1215:static void damos_commit_quota_goal(\nmm/damon/core.c:1216:\t\tstruct damos_quota_goal *dst, struct damos_quota_goal *src)\nmm/damon/core.c-1217-{\n--\nmm/damon/core.c-1221-\t\tdst-\u003ecurrent_value = src-\u003ecurrent_value;\nmm/damon/core.c:1222:\tdamos_commit_quota_goal_union(dst, src);\nmm/damon/core.c-1223-}\n--\nmm/damon/core.c-1225-/**\nmm/damon/core.c:1226: * damos_commit_quota_goals() - Commit DAMOS quota goals to another quota.\nmm/damon/core.c-1227- * @dst:\tThe commit destination DAMOS quota.\n--\nmm/damon/core.c-1236- */\nmm/damon/core.c:1237:int damos_commit_quota_goals(struct damos_quota *dst, struct damos_quota *src)\nmm/damon/core.c-1238-{\nmm/damon/core.c:1239:\tstruct damos_quota_goal *dst_goal, *next, *src_goal, *new_goal;\nmm/damon/core.c-1240-\tint i = 0, j = 0;\nmm/damon/core.c-1241-\nmm/damon/core.c:1242:\tdamos_for_each_quota_goal_safe(dst_goal, next, dst) {\nmm/damon/core.c:1243:\t\tsrc_goal = damos_nth_quota_goal(i++, src);\nmm/damon/core.c-1244-\t\tif (src_goal)\nmm/damon/core.c:1245:\t\t\tdamos_commit_quota_goal(dst_goal, src_goal);\nmm/damon/core.c-1246-\t\telse\nmm/damon/core.c:1247:\t\t\tdamos_destroy_quota_goal(dst_goal);\nmm/damon/core.c-1248-\t}\nmm/damon/core.c:1249:\tdamos_for_each_quota_goal_safe(src_goal, next, src) {\nmm/damon/core.c-1250-\t\tif (j++ \u003c i)\nmm/damon/core.c-1251-\t\t\tcontinue;\nmm/damon/core.c:1252:\t\tnew_goal = damos_new_quota_goal(\nmm/damon/core.c-1253-\t\t\t\tsrc_goal-\u003emetric, src_goal-\u003etarget_value);\n--\nmm/damon/core.c-1255-\t\t\treturn -ENOMEM;\nmm/damon/core.c:1256:\t\tdamos_commit_quota_goal(new_goal, src_goal);\nmm/damon/core.c:1257:\t\tdamos_add_quota_goal(dst, new_goal);\nmm/damon/core.c-1258-\t}\n--\nmm/damon/core.c-1261-\nmm/damon/core.c:1262:static int damos_commit_quota(struct damos_quota *dst, struct damos_quota *src)\nmm/damon/core.c-1263-{\n--\nmm/damon/core.c-1268-\tdst-\u003esz = src-\u003esz;\nmm/damon/core.c:1269:\terr = damos_commit_quota_goals(dst, src);\nmm/damon/core.c-1270-\tif (err)\n--\nmm/damon/core.c=1519=static int damos_commit(struct damos *dst, struct damos *src)\n--\nmm/damon/core.c-1526-\nmm/damon/core.c:1527:\terr = damos_commit_quota(\u0026dst-\u003equota, \u0026src-\u003equota);\nmm/damon/core.c-1528-\tif (err)\n--\nmm/damon/core.c=1862=static int __damon_commit_ctx(struct damon_ctx *dst, struct damon_ctx *src)\n--\nmm/damon/core.c-1865-\tstruct damos *scheme;\nmm/damon/core.c:1866:\tstruct damos_quota_goal *goal;\nmm/damon/core.c-1867-\n--\nmm/damon/core.c-1874-\t\tdamon_for_each_scheme(scheme, src) {\nmm/damon/core.c:1875:\t\t\tstruct damos_quota *quota = \u0026scheme-\u003equota;\nmm/damon/core.c-1876-\nmm/damon/core.c:1877:\t\t\tdamos_for_each_quota_goal(goal, quota) {\nmm/damon/core.c-1878-\t\t\t\tif (goal-\u003emetric ==\n--\nmm/damon/core.c=2371=static bool __damos_valid_target(struct damon_region *r, struct damos *s,\n--\nmm/damon/core.c-2386-/*\nmm/damon/core.c:2387: * damos_quota_is_set() - Return if the given quota is actually set.\nmm/damon/core.c-2388- * @quota:\tThe quota to check.\n--\nmm/damon/core.c-2391- */\nmm/damon/core.c:2392:static bool damos_quota_is_set(struct damos_quota *quota)\nmm/damon/core.c-2393-{\nmm/damon/core.c-2394-\treturn quota-\u003eesz || quota-\u003esz || quota-\u003ems ||\nmm/damon/core.c:2395:\t\t!damos_quota_goals_empty(quota);\nmm/damon/core.c-2396-}\n--\nmm/damon/core.c=2398=static bool damos_valid_target(struct damon_ctx *c, struct damon_region *r,\n--\nmm/damon/core.c-2402-\nmm/damon/core.c:2403:\tif (!ret || !damos_quota_is_set(\u0026s-\u003equota) || !c-\u003eops.get_scheme_score)\nmm/damon/core.c-2404-\t\treturn ret;\n--\nmm/damon/core.c=2434=static bool damos_skip_charged_region(struct damon_target *t,\n--\nmm/damon/core.c-2437-{\nmm/damon/core.c:2438:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-2439-\tunsigned long sz_to_skip;\n--\nmm/damon/core.c=2619=static void damos_walk_cancel(struct damon_ctx *ctx)\n--\nmm/damon/core.c-2635-\nmm/damon/core.c:2636:static void damos_charge_quota(struct damos_quota *quota,\nmm/damon/core.c-2637-\t\tunsigned long sz_region, unsigned long sz_applied)\n--\nmm/damon/core.c-2652-\nmm/damon/core.c:2653:static bool damos_quota_is_full(struct damos_quota *quota,\nmm/damon/core.c-2654-\t\tunsigned long min_region_sz)\nmm/damon/core.c-2655-{\nmm/damon/core.c:2656:\tif (!damos_quota_is_set(quota))\nmm/damon/core.c-2657-\t\treturn false;\n--\nmm/damon/core.c=2667=static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t,\n--\nmm/damon/core.c-2669-{\nmm/damon/core.c:2670:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-2671-\tunsigned long sz = damon_sz_region(r);\n--\nmm/damon/core.c-2704-\tif (c-\u003eops.apply_scheme) {\nmm/damon/core.c:2705:\t\tif (damos_quota_is_set(quota) \u0026\u0026\nmm/damon/core.c-2706-\t\t\t\tquota-\u003echarged_sz + sz \u003e quota-\u003eesz) {\n--\nmm/damon/core.c-2724-\t\t\ttimespec64_to_ns(\u0026begin);\nmm/damon/core.c:2725:\t\tdamos_charge_quota(quota, sz, sz_applied);\nmm/damon/core.c:2726:\t\tif (damos_quota_is_full(quota, c-\u003emin_region_sz)) {\nmm/damon/core.c-2727-\t\t\tquota-\u003echarge_target_from = t;\n--\nmm/damon/core.c=2738=static void damon_do_apply_schemes(struct damon_ctx *c,\n--\nmm/damon/core.c-2744-\tdamon_for_each_scheme(s, c) {\nmm/damon/core.c:2745:\t\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-2746-\n--\nmm/damon/core.c-2753-\t\t/* Check the quota */\nmm/damon/core.c:2754:\t\tif (damos_quota_is_full(quota, c-\u003emin_region_sz))\nmm/damon/core.c-2755-\t\t\tcontinue;\n--\nmm/damon/core.c=2900=static __kernel_ulong_t damos_get_node_mem_bp(\nmm/damon/core.c:2901:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-2902-{\n--\nmm/damon/core.c=2928=static unsigned long damos_get_node_memcg_used_bp(\nmm/damon/core.c:2929:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-2930-{\n--\nmm/damon/core.c=3082=static __kernel_ulong_t damos_get_node_mem_bp(\nmm/damon/core.c:3083:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-3084-{\n--\nmm/damon/core.c=3088=static unsigned long damos_get_node_memcg_used_bp(\nmm/damon/core.c:3089:\t\tstruct damos_quota_goal *goal)\nmm/damon/core.c-3090-{\n--\nmm/damon/core.c=3119=static unsigned int damos_hugepage_mem_bp(void)\n--\nmm/damon/core.c-3134-\nmm/damon/core.c:3135:static void damos_set_quota_goal_current_value(struct damon_ctx *c,\nmm/damon/core.c:3136:\t\tstruct damos *s, struct damos_quota_goal *goal)\nmm/damon/core.c-3137-{\n--\nmm/damon/core.c-3179-/* Return the highest score since it makes schemes least aggressive */\nmm/damon/core.c:3180:static unsigned long damos_quota_score(struct damon_ctx *c, struct damos *s)\nmm/damon/core.c-3181-{\nmm/damon/core.c:3182:\tstruct damos_quota_goal *goal;\nmm/damon/core.c:3183:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-3184-\tunsigned long highest_score = 0;\nmm/damon/core.c-3185-\nmm/damon/core.c:3186:\tdamos_for_each_quota_goal(goal, quota) {\nmm/damon/core.c:3187:\t\tdamos_set_quota_goal_current_value(c, s, goal);\nmm/damon/core.c-3188-\t\thighest_score = max(highest_score,\n--\nmm/damon/core.c=3196=static void damos_goal_tune_esz_bp_consist(struct damon_ctx *c, struct damos *s)\nmm/damon/core.c-3197-{\nmm/damon/core.c:3198:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c:3199:\tunsigned long score = damos_quota_score(c, s);\nmm/damon/core.c-3200-\n--\nmm/damon/core.c=3205=static void damos_goal_tune_esz_bp_temporal(struct damon_ctx *c,\n--\nmm/damon/core.c-3207-{\nmm/damon/core.c:3208:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c:3209:\tunsigned long score = damos_quota_score(c, s);\nmm/damon/core.c-3210-\n--\nmm/damon/core.c-3221- */\nmm/damon/core.c:3222:static void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)\nmm/damon/core.c-3223-{\nmm/damon/core.c:3224:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-3225-\tunsigned long throughput;\n--\nmm/damon/core.c=3260=static void damos_trace_esz(struct damon_ctx *c, struct damos *s,\nmm/damon/core.c:3261:\t\tstruct damos_quota *quota)\nmm/damon/core.c-3262-{\n--\nmm/damon/core.c-3270-\t}\nmm/damon/core.c:3271:\ttrace_damos_esz(cidx, sidx, quota-\u003eesz);\nmm/damon/core.c-3272-}\nmm/damon/core.c-3273-\nmm/damon/core.c:3274:static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)\nmm/damon/core.c-3275-{\nmm/damon/core.c:3276:\tstruct damos_quota *quota = \u0026s-\u003equota;\nmm/damon/core.c-3277-\tstruct damon_target *t;\n--\nmm/damon/core.c-3287-\t\tquota-\u003echarged_from = jiffies;\nmm/damon/core.c:3288:\t\tdamos_set_effective_quota(c, s);\nmm/damon/core.c-3289-\t\tif (trace_damos_esz_enabled())\nmm/damon/core.c:3290:\t\t\tdamos_trace_esz(c, s, quota);\nmm/damon/core.c-3291-\t}\n--\nmm/damon/core.c-3296-\t\t\t\tmsecs_to_jiffies(quota-\u003ereset_interval))) {\nmm/damon/core.c:3297:\t\tif (damos_quota_is_full(quota, c-\u003emin_region_sz))\nmm/damon/core.c-3298-\t\t\ts-\u003estat.qt_exceeds++;\n--\nmm/damon/core.c-3303-\t\t\tcached_esz = quota-\u003eesz;\nmm/damon/core.c:3304:\t\tdamos_set_effective_quota(c, s);\nmm/damon/core.c:3305:\t\tif (trace_damos_esz_enabled() \u0026\u0026 quota-\u003eesz != cached_esz)\nmm/damon/core.c:3306:\t\t\tdamos_trace_esz(c, s, quota);\nmm/damon/core.c-3307-\t}\n--\nmm/damon/core.c=3355=static void kdamond_apply_schemes(struct damon_ctx *c)\n--\nmm/damon/core.c-3370-\nmm/damon/core.c:3371:\t\tdamos_adjust_quota(c, s);\nmm/damon/core.c-3372-\t}\n--\nmm/damon/lru_sort.c=104=module_param(cold_min_age, ulong, 0600);\nmm/damon/lru_sort.c-105-\nmm/damon/lru_sort.c:106:static struct damos_quota damon_lru_sort_quota = {\nmm/damon/lru_sort.c-107-\t/* Use up to 10 ms per 1 sec, by default */\n--\nmm/damon/lru_sort.c=188=static struct damos *damon_lru_sort_new_scheme(\n--\nmm/damon/lru_sort.c-190-{\nmm/damon/lru_sort.c:191:\tstruct damos_quota quota = damon_lru_sort_quota;\nmm/damon/lru_sort.c-192-\n--\nmm/damon/lru_sort.c=229=static int damon_lru_sort_add_quota_goals(struct damos *hot_scheme,\n--\nmm/damon/lru_sort.c-231-{\nmm/damon/lru_sort.c:232:\tstruct damos_quota_goal *goal;\nmm/damon/lru_sort.c-233-\n--\nmm/damon/lru_sort.c-237-\t\treturn -EINVAL;\nmm/damon/lru_sort.c:238:\tgoal = damos_new_quota_goal(DAMOS_QUOTA_ACTIVE_MEM_BP, active_mem_bp);\nmm/damon/lru_sort.c-239-\tif (!goal)\nmm/damon/lru_sort.c-240-\t\treturn -ENOMEM;\nmm/damon/lru_sort.c:241:\tdamos_add_quota_goal(\u0026hot_scheme-\u003equota, goal);\nmm/damon/lru_sort.c-242-\t/* aim 0.2 % goal conflict, to keep little ping pong */\nmm/damon/lru_sort.c:243:\tgoal = damos_new_quota_goal(DAMOS_QUOTA_INACTIVE_MEM_BP,\nmm/damon/lru_sort.c-244-\t\t\t10000 - active_mem_bp + 2);\n--\nmm/damon/lru_sort.c-246-\t\treturn -ENOMEM;\nmm/damon/lru_sort.c:247:\tdamos_add_quota_goal(\u0026cold_scheme-\u003equota, goal);\nmm/damon/lru_sort.c-248-\treturn 0;\n--\nmm/damon/reclaim.c=48=module_param(min_age, ulong, 0600);\nmm/damon/reclaim.c-49-\nmm/damon/reclaim.c:50:static struct damos_quota damon_reclaim_quota = {\nmm/damon/reclaim.c-51-\t/* use up to 10 ms time, reclaim up to 128 MiB per 1 sec by default */\n--\nmm/damon/reclaim.c=194=static int damon_reclaim_apply_parameters(void)\n--\nmm/damon/reclaim.c-199-\tstruct damos *scheme;\nmm/damon/reclaim.c:200:\tstruct damos_quota_goal *goal;\nmm/damon/reclaim.c-201-\tstruct damos_filter *filter;\n--\nmm/damon/reclaim.c-235-\tif (quota_mem_pressure_us) {\nmm/damon/reclaim.c:236:\t\tgoal = damos_new_quota_goal(DAMOS_QUOTA_SOME_MEM_PSI_US,\nmm/damon/reclaim.c-237-\t\t\t\tquota_mem_pressure_us);\n--\nmm/damon/reclaim.c-239-\t\t\tgoto out;\nmm/damon/reclaim.c:240:\t\tdamos_add_quota_goal(\u0026scheme-\u003equota, goal);\nmm/damon/reclaim.c-241-\t}\n--\nmm/damon/reclaim.c-243-\tif (quota_autotune_feedback) {\nmm/damon/reclaim.c:244:\t\tgoal = damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000);\nmm/damon/reclaim.c-245-\t\tif (!goal)\n--\nmm/damon/reclaim.c-247-\t\tgoal-\u003ecurrent_value = quota_autotune_feedback;\nmm/damon/reclaim.c:248:\t\tdamos_add_quota_goal(\u0026scheme-\u003equota, goal);\nmm/damon/reclaim.c-249-\t}\n--\nmm/damon/sysfs-common.h=51=int damon_sysfs_schemes_clear_regions(\n--\nmm/damon/sysfs-common.h-53-\nmm/damon/sysfs-common.h:54:int damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,\nmm/damon/sysfs-common.h-55-\t\tstruct damon_ctx *ctx);\nmm/damon/sysfs-common.h-56-\nmm/damon/sysfs-common.h:57:void damos_sysfs_update_effective_quotas(\nmm/damon/sysfs-common.h-58-\t\tstruct damon_sysfs_schemes *sysfs_schemes,\n--\nmm/damon/sysfs-schemes.c=1205=static const struct kobj_type damon_sysfs_watermarks_ktype = {\n--\nmm/damon/sysfs-schemes.c-1214-\nmm/damon/sysfs-schemes.c:1215:struct damos_sysfs_quota_goal {\nmm/damon/sysfs-schemes.c-1216-\tstruct kobject kobj;\nmm/damon/sysfs-schemes.c:1217:\tenum damos_quota_goal_metric metric;\nmm/damon/sysfs-schemes.c-1218-\tunsigned long target_value;\n--\nmm/damon/sysfs-schemes.c-1223-\nmm/damon/sysfs-schemes.c:1224:static struct damos_sysfs_quota_goal *damos_sysfs_quota_goal_alloc(void)\nmm/damon/sysfs-schemes.c-1225-{\nmm/damon/sysfs-schemes.c:1226:\treturn kzalloc_obj(struct damos_sysfs_quota_goal);\nmm/damon/sysfs-schemes.c-1227-}\n--\nmm/damon/sysfs-schemes.c=1229=struct damos_sysfs_qgoal_metric_name {\nmm/damon/sysfs-schemes.c:1230:\tenum damos_quota_goal_metric metric;\nmm/damon/sysfs-schemes.c-1231-\tchar *name;\n--\nmm/damon/sysfs-schemes.c=1278=static ssize_t target_metric_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1280-{\nmm/damon/sysfs-schemes.c:1281:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1282:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1283-\tint i;\n--\nmm/damon/sysfs-schemes.c=1295=static ssize_t target_metric_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1297-{\nmm/damon/sysfs-schemes.c:1298:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1299:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1300-\tint i;\n--\nmm/damon/sysfs-schemes.c=1314=static ssize_t target_value_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1316-{\nmm/damon/sysfs-schemes.c:1317:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1318:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1319-\n--\nmm/damon/sysfs-schemes.c=1323=static ssize_t target_value_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1325-{\nmm/damon/sysfs-schemes.c:1326:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1327:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1328-\tint err = kstrtoul(buf, 0, \u0026goal-\u003etarget_value);\n--\nmm/damon/sysfs-schemes.c=1333=static ssize_t current_value_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1335-{\nmm/damon/sysfs-schemes.c:1336:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1337:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1338-\n--\nmm/damon/sysfs-schemes.c=1342=static ssize_t current_value_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1344-{\nmm/damon/sysfs-schemes.c:1345:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1346:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1347-\tint err = kstrtoul(buf, 0, \u0026goal-\u003ecurrent_value);\n--\nmm/damon/sysfs-schemes.c=1353=static ssize_t nid_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1355-{\nmm/damon/sysfs-schemes.c:1356:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1357:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1358-\n--\nmm/damon/sysfs-schemes.c=1363=static ssize_t nid_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1365-{\nmm/damon/sysfs-schemes.c:1366:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj, struct\nmm/damon/sysfs-schemes.c:1367:\t\t\tdamos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1368-\tint err = kstrtoint(buf, 0, \u0026goal-\u003enid);\n--\nmm/damon/sysfs-schemes.c=1374=static ssize_t path_show(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1376-{\nmm/damon/sysfs-schemes.c:1377:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1378:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1379-\tint len;\n--\nmm/damon/sysfs-schemes.c=1388=static ssize_t path_store(struct kobject *kobj,\n--\nmm/damon/sysfs-schemes.c-1390-{\nmm/damon/sysfs-schemes.c:1391:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1392:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1393-\tchar *path = kmalloc_array(size_add(count, 1), sizeof(*path),\n--\nmm/damon/sysfs-schemes.c-1409-\nmm/damon/sysfs-schemes.c:1410:static void damos_sysfs_quota_goal_release(struct kobject *kobj)\nmm/damon/sysfs-schemes.c-1411-{\nmm/damon/sysfs-schemes.c:1412:\tstruct damos_sysfs_quota_goal *goal = container_of(kobj,\nmm/damon/sysfs-schemes.c:1413:\t\t\tstruct damos_sysfs_quota_goal, kobj);\nmm/damon/sysfs-schemes.c-1414-\n--\nmm/damon/sysfs-schemes.c-1418-\nmm/damon/sysfs-schemes.c:1419:static struct kobj_attribute damos_sysfs_quota_goal_target_metric_attr =\nmm/damon/sysfs-schemes.c-1420-\t\t__ATTR_RW_MODE(target_metric, 0600);\nmm/damon/sysfs-schemes.c-1421-\nmm/damon/sysfs-schemes.c:1422:static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr =\nmm/damon/sysfs-schemes.c-1423-\t\t__ATTR_RW_MODE(target_value, 0600);\nmm/damon/sysfs-schemes.c-1424-\nmm/damon/sysfs-schemes.c:1425:static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr =\nmm/damon/sysfs-schemes.c-1426-\t\t__ATTR_RW_MODE(current_value, 0600);\nmm/damon/sysfs-schemes.c-1427-\nmm/damon/sysfs-schemes.c:1428:static struct kobj_attribute damos_sysfs_quota_goal_nid_attr =\nmm/damon/sysfs-schemes.c-1429-\t\t__ATTR_RW_MODE(nid, 0600);\nmm/damon/sysfs-schemes.c-1430-\nmm/damon/sysfs-schemes.c:1431:static struct kobj_attribute damos_sysfs_quota_goal_path_attr =\nmm/damon/sysfs-schemes.c-1432-\t\t__ATTR_RW_MODE(path, 0600);\nmm/damon/sysfs-schemes.c-1433-\nmm/damon/sysfs-schemes.c:1434:static struct attribute *damos_sysfs_quota_goal_attrs[] = {\nmm/damon/sysfs-schemes.c:1435:\t\u0026damos_sysfs_quota_goal_target_metric_attr.attr,\nmm/damon/sysfs-schemes.c:1436:\t\u0026damos_sysfs_quota_goal_target_value_attr.attr,\nmm/damon/sysfs-schemes.c:1437:\t\u0026damos_sysfs_quota_goal_current_value_attr.attr,\nmm/damon/sysfs-schemes.c:1438:\t\u0026damos_sysfs_quota_goal_nid_attr.attr,\nmm/damon/sysfs-schemes.c:1439:\t\u0026damos_sysfs_quota_goal_path_attr.attr,\nmm/damon/sysfs-schemes.c-1440-\tNULL,\nmm/damon/sysfs-schemes.c-1441-};\nmm/damon/sysfs-schemes.c:1442:ATTRIBUTE_GROUPS(damos_sysfs_quota_goal);\nmm/damon/sysfs-schemes.c-1443-\nmm/damon/sysfs-schemes.c:1444:static const struct kobj_type damos_sysfs_quota_goal_ktype = {\nmm/damon/sysfs-schemes.c:1445:\t.release = damos_sysfs_quota_goal_release,\nmm/damon/sysfs-schemes.c-1446-\t.sysfs_ops = \u0026kobj_sysfs_ops,\nmm/damon/sysfs-schemes.c:1447:\t.default_groups = damos_sysfs_quota_goal_groups,\nmm/damon/sysfs-schemes.c-1448-};\n--\nmm/damon/sysfs-schemes.c-1453-\nmm/damon/sysfs-schemes.c:1454:struct damos_sysfs_quota_goals {\nmm/damon/sysfs-schemes.c-1455-\tstruct kobject kobj;\nmm/damon/sysfs-schemes.c:1456:\tstruct damos_sysfs_quota_goal **goals_arr;\t/* counted by nr */\nmm/damon/sysfs-schemes.c-1457-\tint nr;\n--\nmm/damon/sysfs-schemes.c-1459-\nmm/damon/sysfs-schemes.c:1460:static struct damos_sysfs_quota_goals *damos_sysfs_quota_goals_alloc(void)\nmm/damon/sysfs-schemes.c-1461-{\nmm/damon/sysfs-schemes.c:1462:\treturn kzalloc_obj(struct damos_sysfs_quota_goals);\nmm/damon/sysfs-schemes.c-1463-}\nmm/damon/sysfs-schemes.c-1464-\nmm/damon/sysfs-schemes.c:1465:static void damos_sysfs_quota_goals_rm_dirs(\nmm/damon/sysfs-schemes.c:1466:\t\tstruct damos_sysfs_quota_goals *goals)\nmm/damon/sysfs-schemes.c-1467-{\nmm/damon/sysfs-schemes.c:1468:\tstruct damos_sysfs_quota_goal **goals_arr = goals-\u003egoals_arr;\nmm/damon/sysfs-schemes.c-1469-\tint i;\n--\nmm/damon/sysfs-schemes.c-1479-\nmm/damon/sysfs-schemes.c:1480:static int damos_sysfs_quota_goals_add_dirs(\nmm/damon/sysfs-schemes.c:1481:\t\tstruct damos_sysfs_quota_goals *goals, int nr_goals)\n\n"
}
23/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 44058
							output: 59
							thoughts: 235

Thoughts: 
**Analyzing the DAMON Quota Management Code**

Okay, let's break this down. My initial focus is on `damos_set_effective_quota`. Since it's a static function, I need to understand its relationship to the wider system. I need to trace it and find out the entrypoints or any non-static functions it interacts with directly or indirectly. First, I'll examine the callers of `damos_set_effective_quota`.

Right, I see that `damos_adjust_quota` calls it. That's also a static function, which in turn is called by `kdamond_apply_schemes`, also static. And *that* is called by `kdamond_fn`, which is a kthread. That's one path. Got it. Also, I see it's called during the DAMON commit process, and during sysfs operations - start, update.

Next, I'll broaden my search. I'll need to look at functions like `damon_start`, `damon_commit_schemes`, `damon_set_schemes`, `damos_commit_quota_goals`, `damos_new_quota_goal`, `damos_add_quota_goal`, `damon_sysfs_schemes_update_stats`, `damos_sysfs_update_effective_quotas`, `damon_sysfs_apply_inputs`. Those could be entry points that eventually trigger a call to `damos_set_effective_quota`. I need to fully understand all the paths.

Finally, to be thorough, I'll need to delve into the source code itself. I'll focus on `mm/damon/core.c` and `mm/damon/sysfs.c`. My aim is to look for non-static functions that might act as interfaces or entry points into this quota management logic.

24/2 2026/09/02 23:42 tool grepper
0m Args: 
{
  "Expression": "^[a-zA-Z_][a-zA-Z0-9_ ]*\\*?[a-zA-Z0-9_]+\\(",
  "PathPrefix": "mm/damon/core.c"
}

Results: 
{
  "Output": "\nFull output is too long, showing 500 out of 806 lines.\nUse more precise expression if possible.\n\nmm/damon/core.c-25-\nmm/damon/core.c:26:static DEFINE_MUTEX(damon_lock);\nmm/damon/core.c-27-static int nr_running_ctxs;\nmm/damon/core.c=28=static bool running_exclusive_ctxs;\nmm/damon/core.c-29-\nmm/damon/core.c:30:static DEFINE_MUTEX(damon_ops_lock);\nmm/damon/core.c-31-static struct damon_operations damon_registered_ops[NR_DAMON_OPS];\n--\nmm/damon/core.c=33=static struct kmem_cache *damon_region_cache __ro_after_init;\n--\nmm/damon/core.c-35-/* Should be called under damon_ops_lock with id smaller than NR_DAMON_OPS */\nmm/damon/core.c:36:static bool __damon_is_registered_ops(enum damon_ops_id id)\nmm/damon/core.c-37-{\n--\nmm/damon/core.c-50- */\nmm/damon/core.c:51:bool damon_is_registered_ops(enum damon_ops_id id)\nmm/damon/core.c-52-{\n--\nmm/damon/core.c-71- */\nmm/damon/core.c:72:int damon_register_ops(struct damon_operations *ops)\nmm/damon/core.c-73-{\n--\nmm/damon/core.c-98- */\nmm/damon/core.c:99:int damon_select_ops(struct damon_ctx *ctx, enum damon_ops_id id)\nmm/damon/core.c-100-{\n--\nmm/damon/core.c-114-\nmm/damon/core.c:115:struct damon_prep *damon_new_prep(enum damon_prep_action action)\nmm/damon/core.c-116-{\n--\nmm/damon/core.c-126-\nmm/damon/core.c:127:void damon_add_prep(struct damon_probe *p, struct damon_prep *prep)\nmm/damon/core.c-128-{\n--\nmm/damon/core.c-131-\nmm/damon/core.c:132:static void damon_del_prep(struct damon_prep *p)\nmm/damon/core.c-133-{\n--\nmm/damon/core.c-136-\nmm/damon/core.c:137:static void damon_free_prep(struct damon_prep *p)\nmm/damon/core.c-138-{\n--\nmm/damon/core.c-141-\nmm/damon/core.c:142:static void damon_destroy_prep(struct damon_prep *p)\nmm/damon/core.c-143-{\n--\nmm/damon/core.c-147-\nmm/damon/core.c:148:static struct damon_prep *damon_nth_prep(int n, struct damon_probe *p)\nmm/damon/core.c-149-{\n--\nmm/damon/core.c-159-\nmm/damon/core.c:160:static bool damon_has_prep(struct damon_ctx *c)\nmm/damon/core.c-161-{\n--\nmm/damon/core.c-171-\nmm/damon/core.c:172:struct damon_filter *damon_new_filter(enum damon_filter_type type,\nmm/damon/core.c-173-\t\tbool matching, bool allow)\n--\nmm/damon/core.c-186-\nmm/damon/core.c:187:void damon_add_filter(struct damon_probe *p, struct damon_filter *f)\nmm/damon/core.c-188-{\n--\nmm/damon/core.c-191-\nmm/damon/core.c:192:static void damon_del_filter(struct damon_filter *f)\nmm/damon/core.c-193-{\n--\nmm/damon/core.c-196-\nmm/damon/core.c:197:static void damon_free_filter(struct damon_filter *f)\nmm/damon/core.c-198-{\n--\nmm/damon/core.c-201-\nmm/damon/core.c:202:void damon_destroy_filter(struct damon_filter *f)\nmm/damon/core.c-203-{\n--\nmm/damon/core.c-207-\nmm/damon/core.c:208:static struct damon_filter *damon_nth_filter(int n, struct damon_probe *p)\nmm/damon/core.c-209-{\n--\nmm/damon/core.c-219-\nmm/damon/core.c:220:struct damon_probe *damon_new_probe(void)\nmm/damon/core.c-221-{\n--\nmm/damon/core.c-233-\nmm/damon/core.c:234:void damon_add_probe(struct damon_ctx *ctx, struct damon_probe *probe)\nmm/damon/core.c-235-{\n--\nmm/damon/core.c-238-\nmm/damon/core.c:239:static void damon_del_probe(struct damon_probe *p)\nmm/damon/core.c-240-{\n--\nmm/damon/core.c-243-\nmm/damon/core.c:244:static void damon_free_probe(struct damon_probe *p)\nmm/damon/core.c-245-{\n--\nmm/damon/core.c-255-\nmm/damon/core.c:256:static void damon_destroy_probe(struct damon_probe *p)\nmm/damon/core.c-257-{\n--\nmm/damon/core.c-261-\nmm/damon/core.c:262:static struct damon_probe *damon_nth_probe(int n, struct damon_ctx *ctx)\nmm/damon/core.c-263-{\n--\nmm/damon/core.c-273-\nmm/damon/core.c:274:static bool damon_has_probe_weights(struct damon_ctx *c)\nmm/damon/core.c-275-{\n--\nmm/damon/core.c-305- */\nmm/damon/core.c:306:static unsigned long damon_mvsum(unsigned long current_nr,\nmm/damon/core.c-307-\t\tunsigned long last_nr, unsigned long left_window_bp)\n--\nmm/damon/core.c-325- */\nmm/damon/core.c:326:unsigned int damon_nr_accesses_mvsum(struct damon_region *r,\nmm/damon/core.c-327-\t\tstruct damon_ctx *ctx)\n--\nmm/damon/core.c-349-\nmm/damon/core.c:350:unsigned char damon_probe_hits_mvsum(int probe_idx, struct damon_region *r,\nmm/damon/core.c-351-\t\tstruct damon_ctx *ctx)\n--\nmm/damon/core.c-374-#ifdef CONFIG_DAMON_DEBUG_SANITY\nmm/damon/core.c:375:static void damon_verify_new_region(unsigned long start, unsigned long end)\nmm/damon/core.c-376-{\n--\nmm/damon/core.c-379-#else\nmm/damon/core.c:380:static void damon_verify_new_region(unsigned long start, unsigned long end)\nmm/damon/core.c-381-{\n--\nmm/damon/core.c-389- */\nmm/damon/core.c:390:struct damon_region *damon_new_region(unsigned long start, unsigned long end)\nmm/damon/core.c-391-{\n--\nmm/damon/core.c-414-\nmm/damon/core.c:415:static void damon_add_region(struct damon_region *r, struct damon_target *t)\nmm/damon/core.c-416-{\n--\nmm/damon/core.c-423- */\nmm/damon/core.c:424:static inline void damon_insert_region(struct damon_region *r,\nmm/damon/core.c-425-\t\tstruct damon_region *prev, struct damon_region *next,\n--\nmm/damon/core.c-432-#ifdef CONFIG_DAMON_DEBUG_SANITY\nmm/damon/core.c:433:static void damon_verify_del_region(struct damon_target *t)\nmm/damon/core.c-434-{\n--\nmm/damon/core.c-437-#else\nmm/damon/core.c:438:static void damon_verify_del_region(struct damon_target *t)\nmm/damon/core.c-439-{\n--\nmm/damon/core.c-442-\nmm/damon/core.c:443:static void damon_del_region(struct damon_region *r, struct damon_target *t)\nmm/damon/core.c-444-{\n--\nmm/damon/core.c-450-\nmm/damon/core.c:451:static void damon_free_region(struct damon_region *r)\nmm/damon/core.c-452-{\n--\nmm/damon/core.c-455-\nmm/damon/core.c:456:static void damon_destroy_region(struct damon_region *r,\nmm/damon/core.c-457-\t\tstruct damon_target *t)\n--\nmm/damon/core.c-462-\nmm/damon/core.c:463:static bool damon_is_last_region(struct damon_region *r,\nmm/damon/core.c-464-\t\tstruct damon_target *t)\n--\nmm/damon/core.c-476- */\nmm/damon/core.c:477:unsigned int damon_probe_hits_wsum(struct damon_region *r, bool last,\nmm/damon/core.c-478-\t\tstruct damon_ctx *ctx)\n--\nmm/damon/core.c-497- */\nmm/damon/core.c:498:static bool damon_intersect(struct damon_region *r,\nmm/damon/core.c-499-\t\tstruct damon_addr_range *re)\n--\nmm/damon/core.c-506- */\nmm/damon/core.c:507:static int damon_fill_regions_holes(struct damon_region *first,\nmm/damon/core.c-508-\t\tstruct damon_region *last, struct damon_target *t)\n--\nmm/damon/core.c-539- */\nmm/damon/core.c:540:int damon_set_regions(struct damon_target *t, struct damon_addr_range *ranges,\nmm/damon/core.c-541-\t\tunsigned int nr_ranges, unsigned long min_region_sz)\n--\nmm/damon/core.c-630-\nmm/damon/core.c:631:struct damos_filter *damos_new_filter(enum damos_filter_type type,\nmm/damon/core.c-632-\t\tbool matching, bool allow)\n--\nmm/damon/core.c-652- */\nmm/damon/core.c:653:bool damos_filter_for_ops(enum damos_filter_type type)\nmm/damon/core.c-654-{\n--\nmm/damon/core.c-664-\nmm/damon/core.c:665:void damos_add_filter(struct damos *s, struct damos_filter *f)\nmm/damon/core.c-666-{\n--\nmm/damon/core.c-672-\nmm/damon/core.c:673:static void damos_del_filter(struct damos_filter *f)\nmm/damon/core.c-674-{\n--\nmm/damon/core.c-677-\nmm/damon/core.c:678:static void damos_free_filter(struct damos_filter *f)\nmm/damon/core.c-679-{\n--\nmm/damon/core.c-682-\nmm/damon/core.c:683:void damos_destroy_filter(struct damos_filter *f)\nmm/damon/core.c-684-{\n--\nmm/damon/core.c-688-\nmm/damon/core.c:689:struct damos_quota_goal *damos_new_quota_goal(\nmm/damon/core.c-690-\t\tenum damos_quota_goal_metric metric,\n--\nmm/damon/core.c-705-\nmm/damon/core.c:706:void damos_add_quota_goal(struct damos_quota *q, struct damos_quota_goal *g)\nmm/damon/core.c-707-{\n--\nmm/damon/core.c-710-\nmm/damon/core.c:711:static void damos_del_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-712-{\n--\nmm/damon/core.c-715-\nmm/damon/core.c:716:static void damos_free_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-717-{\n--\nmm/damon/core.c-720-\nmm/damon/core.c:721:void damos_destroy_quota_goal(struct damos_quota_goal *g)\nmm/damon/core.c-722-{\n--\nmm/damon/core.c-726-\nmm/damon/core.c:727:static bool damos_quota_goals_empty(struct damos_quota *q)\nmm/damon/core.c-728-{\n--\nmm/damon/core.c-732-/* initialize fields of @quota that normally API users wouldn't set */\nmm/damon/core.c:733:static struct damos_quota *damos_quota_init(struct damos_quota *quota)\nmm/damon/core.c-734-{\n--\nmm/damon/core.c-745-\nmm/damon/core.c:746:struct damos *damon_new_scheme(struct damos_access_pattern *pattern,\nmm/damon/core.c-747-\t\t\tenum damos_action action,\n--\nmm/damon/core.c-787-\nmm/damon/core.c:788:static void damos_set_next_apply_sis(struct damos *s, struct damon_ctx *ctx)\nmm/damon/core.c-789-{\n--\nmm/damon/core.c-798-\nmm/damon/core.c:799:void damon_add_scheme(struct damon_ctx *ctx, struct damos *s)\nmm/damon/core.c-800-{\n--\nmm/damon/core.c-804-\nmm/damon/core.c:805:static void damon_del_scheme(struct damos *s)\nmm/damon/core.c-806-{\n--\nmm/damon/core.c-809-\nmm/damon/core.c:810:static void damon_free_scheme(struct damos *s)\nmm/damon/core.c-811-{\n--\nmm/damon/core.c-814-\nmm/damon/core.c:815:void damon_destroy_scheme(struct damos *s)\nmm/damon/core.c-816-{\n--\nmm/damon/core.c-839- */\nmm/damon/core.c:840:struct damon_target *damon_new_target(void)\nmm/damon/core.c-841-{\n--\nmm/damon/core.c-856-\nmm/damon/core.c:857:void damon_add_target(struct damon_ctx *ctx, struct damon_target *t)\nmm/damon/core.c-858-{\n--\nmm/damon/core.c-864- */\nmm/damon/core.c:865:int damon_set_target_pid(struct damon_target *t, int pid)\nmm/damon/core.c-866-{\n--\nmm/damon/core.c-872-\nmm/damon/core.c:873:static void damon_del_target(struct damon_target *t)\nmm/damon/core.c-874-{\n--\nmm/damon/core.c-877-\nmm/damon/core.c:878:void damon_free_target(struct damon_target *t)\nmm/damon/core.c-879-{\n--\nmm/damon/core.c-886-\nmm/damon/core.c:887:void damon_destroy_target(struct damon_target *t, struct damon_ctx *ctx)\nmm/damon/core.c-888-{\n--\nmm/damon/core.c-896-\nmm/damon/core.c:897:unsigned int damon_nr_regions(struct damon_target *t)\nmm/damon/core.c-898-{\n--\nmm/damon/core.c-901-\nmm/damon/core.c:902:struct damon_ctx *damon_new_ctx(void)\nmm/damon/core.c-903-{\n--\nmm/damon/core.c-941-\nmm/damon/core.c:942:static void damon_destroy_targets(struct damon_ctx *ctx)\nmm/damon/core.c-943-{\n--\nmm/damon/core.c-949-\nmm/damon/core.c:950:void damon_destroy_ctx(struct damon_ctx *ctx)\nmm/damon/core.c-951-{\n--\nmm/damon/core.c-965-\nmm/damon/core.c:966:static bool damon_attrs_equals(const struct damon_attrs *attrs1,\nmm/damon/core.c-967-\t\tconst struct damon_attrs *attrs2)\n--\nmm/damon/core.c-982-\nmm/damon/core.c:983:static unsigned int damon_age_for_new_attrs(unsigned int age,\nmm/damon/core.c-984-\t\tstruct damon_attrs *old_attrs, struct damon_attrs *new_attrs)\n--\nmm/damon/core.c-989-/* convert sample ratio in bp (per 10,000) to count */\nmm/damon/core.c:990:static unsigned int damon_sample_bp_to_count(\nmm/damon/core.c-991-\t\tunsigned int bp, struct damon_attrs *attrs)\n--\nmm/damon/core.c-996-/* convert sample count to ratio in bp (per 10,000) */\nmm/damon/core.c:997:static unsigned int damon_sample_count_to_bp(\nmm/damon/core.c-998-\t\tunsigned int count, struct damon_attrs *attrs)\n--\nmm/damon/core.c-1002-\nmm/damon/core.c:1003:static unsigned int damon_nr_samples_for_new_attrs(unsigned int nr,\nmm/damon/core.c-1004-\t\tstruct damon_attrs *old_attrs, struct damon_attrs *new_attrs)\n--\nmm/damon/core.c-1009-\nmm/damon/core.c:1010:static void damon_update_probe_hits(struct damon_region *r,\nmm/damon/core.c-1011-\t\tstruct damon_attrs *old_attrs, struct damon_attrs *new_attrs,\n--\nmm/damon/core.c-1029-\nmm/damon/core.c:1030:static void damon_update_monitoring_result(struct damon_region *r,\nmm/damon/core.c-1031-\t\tstruct damon_attrs *old_attrs, struct damon_attrs *new_attrs,\n--\nmm/damon/core.c-1059- */\nmm/damon/core.c:1060:static void damon_update_monitoring_results(struct damon_ctx *ctx,\nmm/damon/core.c-1061-\t\tstruct damon_attrs *new_attrs, bool aggregating)\n--\nmm/damon/core.c-1082- */\nmm/damon/core.c:1083:static bool damon_valid_intervals_goal(struct damon_attrs *attrs)\nmm/damon/core.c-1084-{\n--\nmm/damon/core.c-1117- */\nmm/damon/core.c:1118:int damon_set_attrs(struct damon_ctx *ctx, struct damon_attrs *attrs)\nmm/damon/core.c-1119-{\n--\nmm/damon/core.c-1165- */\nmm/damon/core.c:1166:void damon_set_schemes(struct damon_ctx *ctx, struct damos **schemes,\nmm/damon/core.c-1167-\t\t\tssize_t nr_schemes)\n--\nmm/damon/core.c-1177-\nmm/damon/core.c:1178:static struct damos_quota_goal *damos_nth_quota_goal(\nmm/damon/core.c-1179-\t\tint n, struct damos_quota *q)\n--\nmm/damon/core.c-1190-\nmm/damon/core.c:1191:static void damos_commit_quota_goal_union(\nmm/damon/core.c-1192-\t\tstruct damos_quota_goal *dst, struct damos_quota_goal *src)\n--\nmm/damon/core.c-1214-\nmm/damon/core.c:1215:static void damos_commit_quota_goal(\nmm/damon/core.c-1216-\t\tstruct damos_quota_goal *dst, struct damos_quota_goal *src)\n--\nmm/damon/core.c-1236- */\nmm/damon/core.c:1237:int damos_commit_quota_goals(struct damos_quota *dst, struct damos_quota *src)\nmm/damon/core.c-1238-{\n--\nmm/damon/core.c-1261-\nmm/damon/core.c:1262:static int damos_commit_quota(struct damos_quota *dst, struct damos_quota *src)\nmm/damon/core.c-1263-{\n--\nmm/damon/core.c-1280-\nmm/damon/core.c:1281:static struct damos_filter *damos_nth_core_filter(int n, struct damos *s)\nmm/damon/core.c-1282-{\n--\nmm/damon/core.c-1292-\nmm/damon/core.c:1293:static struct damos_filter *damos_nth_ops_filter(int n, struct damos *s)\nmm/damon/core.c-1294-{\n--\nmm/damon/core.c-1304-\nmm/damon/core.c:1305:static void damos_commit_filter_arg(\nmm/damon/core.c-1306-\t\tstruct damos_filter *dst, struct damos_filter *src)\n--\nmm/damon/core.c-1325-\nmm/damon/core.c:1326:static void damos_commit_filter(\nmm/damon/core.c-1327-\t\tstruct damos_filter *dst, struct damos_filter *src)\n--\nmm/damon/core.c-1334-\nmm/damon/core.c:1335:static int damos_commit_core_filters(struct damos *dst, struct damos *src)\nmm/damon/core.c-1336-{\n--\nmm/damon/core.c-1362-\nmm/damon/core.c:1363:static int damos_commit_ops_filters(struct damos *dst, struct damos *src)\nmm/damon/core.c-1364-{\n--\nmm/damon/core.c-1395- */\nmm/damon/core.c:1396:static bool damos_filters_default_reject(struct list_head *filters)\nmm/damon/core.c-1397-{\n--\nmm/damon/core.c-1405-\nmm/damon/core.c:1406:static void damos_set_filters_default_reject(struct damos *s)\nmm/damon/core.c-1407-{\n--\nmm/damon/core.c-1416-\nmm/damon/core.c:1417:static bool damon_valid_probe_params(struct damon_ctx *ctx)\nmm/damon/core.c-1418-{\n--\nmm/damon/core.c-1461- */\nmm/damon/core.c:1462:static int damos_commit_dests(struct damos_migrate_dests *dst,\nmm/damon/core.c-1463-\t\tstruct damos_migrate_dests *src)\n--\nmm/damon/core.c-1492-\nmm/damon/core.c:1493:static int damos_commit_filters(struct damos *dst, struct damos *src)\nmm/damon/core.c-1494-{\n--\nmm/damon/core.c-1506-\nmm/damon/core.c:1507:static struct damos *damon_nth_scheme(int n, struct damon_ctx *ctx)\nmm/damon/core.c-1508-{\n--\nmm/damon/core.c-1518-\nmm/damon/core.c:1519:static int damos_commit(struct damos *dst, struct damos *src)\nmm/damon/core.c-1520-{\n--\nmm/damon/core.c-1545-\nmm/damon/core.c:1546:static int damon_commit_schemes(struct damon_ctx *dst, struct damon_ctx *src)\nmm/damon/core.c-1547-{\n--\nmm/damon/core.c-1581-\nmm/damon/core.c:1582:static struct damon_target *damon_nth_target(int n, struct damon_ctx *ctx)\nmm/damon/core.c-1583-{\n--\nmm/damon/core.c-1600- */\nmm/damon/core.c:1601:static int damon_commit_target_regions(struct damon_target *dst,\nmm/damon/core.c-1602-\t\tstruct damon_target *src, unsigned long src_min_region_sz)\n--\nmm/damon/core.c-1635-\nmm/damon/core.c:1636:static int damon_commit_target(\nmm/damon/core.c-1637-\t\tstruct damon_target *dst, bool dst_has_pid,\n--\nmm/damon/core.c-1662- */\nmm/damon/core.c:1663:static void damon_revert_target_commits(struct damon_ctx *dst,\nmm/damon/core.c-1664-\t\tstruct damon_target *failed, struct damon_ctx *src)\n--\nmm/damon/core.c-1678-\nmm/damon/core.c:1679:static int damon_commit_targets(\nmm/damon/core.c-1680-\t\tstruct damon_ctx *dst, struct damon_ctx *src)\n--\nmm/damon/core.c-1743-\nmm/damon/core.c:1744:static void damon_commit_prep(struct damon_prep *dst, struct damon_prep *src)\nmm/damon/core.c-1745-{\n--\nmm/damon/core.c-1748-\nmm/damon/core.c:1749:static int damon_commit_preps(struct damon_probe *dst, struct damon_probe *src)\nmm/damon/core.c-1750-{\n--\nmm/damon/core.c-1773-\nmm/damon/core.c:1774:static void damon_commit_filter(struct damon_filter *dst,\nmm/damon/core.c-1775-\t\tstruct damon_filter *src)\n--\nmm/damon/core.c-1788-\nmm/damon/core.c:1789:static int damon_commit_filters(struct damon_probe *dst,\nmm/damon/core.c-1790-\t\tstruct damon_probe *src)\n--\nmm/damon/core.c-1822-\nmm/damon/core.c:1823:static int damon_commit_probes(struct damon_ctx *dst, struct damon_ctx *src)\nmm/damon/core.c-1824-{\n--\nmm/damon/core.c-1861-\nmm/damon/core.c:1862:static int __damon_commit_ctx(struct damon_ctx *dst, struct damon_ctx *src)\nmm/damon/core.c-1863-{\n--\nmm/damon/core.c-1919-\nmm/damon/core.c:1920:static struct damon_ctx *damon_new_test_ctx(struct damon_ctx *dst)\nmm/damon/core.c-1921-{\n--\nmm/damon/core.c-1948- */\nmm/damon/core.c:1949:int damon_commit_ctx(struct damon_ctx *dst, struct damon_ctx *src)\nmm/damon/core.c-1950-{\n--\nmm/damon/core.c-1966-/* Returns the size upper limit for each monitoring region */\nmm/damon/core.c:1967:static unsigned long damon_region_sz_limit(struct damon_ctx *ctx)\nmm/damon/core.c-1968-{\n--\nmm/damon/core.c-1985-\nmm/damon/core.c:1986:static int damon_split_region_at(struct damon_target *t,\nmm/damon/core.c-1987-\t\t\t\t  struct damon_region *r, unsigned long sz_r);\n--\nmm/damon/core.c-2001- */\nmm/damon/core.c:2002:static unsigned long damon_apply_min_nr_regions(struct damon_ctx *ctx)\nmm/damon/core.c-2003-{\n--\nmm/damon/core.c-2021-\nmm/damon/core.c:2022:static int kdamond_fn(void *data);\nmm/damon/core.c-2023-\n--\nmm/damon/core.c-2031- */\nmm/damon/core.c:2032:static int __damon_start(struct damon_ctx *ctx)\nmm/damon/core.c-2033-{\n--\nmm/damon/core.c-2068- */\nmm/damon/core.c:2069:int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive)\nmm/damon/core.c-2070-{\n--\nmm/damon/core.c-2113- */\nmm/damon/core.c:2114:static void __damon_stop(struct damon_ctx *ctx)\nmm/damon/core.c-2115-{\n--\nmm/damon/core.c-2133- */\nmm/damon/core.c:2134:void damon_stop(struct damon_ctx **ctxs, int nr_ctxs)\nmm/damon/core.c-2135-{\n--\nmm/damon/core.c-2148- */\nmm/damon/core.c:2149:bool damon_is_running(struct damon_ctx *ctx)\n\n"
}
25/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 53491
							output: 34
							thoughts: 289

Thoughts: 
**DAMON Quota Management - A Quick Review**

Okay, let's get a handle on the key elements for managing DAMON quotas. My mental checklist starts with the core symbols: `damon_start`, `damon_commit_ctx`, `damon_new_scheme`, `damon_set_schemes`, then the quota-specific ones like `damos_new_quota_goal`, `damos_add_quota_goal`, `damos_commit_quota_goals`, `damos_sysfs_set_quota_scores`, and `damos_sysfs_update_effective_quotas`. Need to keep those straight.

Next, I need to confirm the required configurations are in place. I have to verify that `DAMON` itself is enabled, and of course, `DAMON_SYSFS` since that's what I am working with. I need the virtual and physical address monitoring settings, so `DAMON_VADDR` and `DAMON_PADDR` must be set. The same applies to `DAMON_RECLAIM` and `DAMON_LRU_SORT` because these are necessary for the job I am doing.

Just to be thorough, I'll quickly glance over `mm/damon/Kconfig` to make sure there aren't any other configs that might be relevant or that I should be aware of, even if they aren't directly implicated in what I'm doing. It's always good to have the big picture.

26/2 2026/09/02 23:42 tool read-file
0m Args: 
{
  "File": "mm/damon/Kconfig",
  "FirstLine": 80,
  "LineCount": 45
}

Results: 
{
  "Contents": "  80:\t\thelp\n  81:\t\t  This builds the DAMON sysfs interface Kunit test suite.\n  82:\t\n  83:\t\t  For more information on KUnit and unit tests in general, please refer\n  84:\t\t  to the KUnit documentation.\n  85:\t\n  86:\t\t  If unsure, say N.\n  87:\t\n  88:\tconfig DAMON_RECLAIM\n  89:\t\tbool \"Build DAMON-based reclaim (DAMON_RECLAIM)\"\n  90:\t\tdepends on DAMON_PADDR\n  91:\t\thelp\n  92:\t\t  This builds the DAMON-based reclamation subsystem.  It finds pages\n  93:\t\t  that not accessed for a long time (cold) using DAMON and reclaim\n  94:\t\t  those.\n  95:\t\n  96:\t\t  This is suggested to be used as a proactive and lightweight\n  97:\t\t  reclamation under light memory pressure, while the traditional page\n  98:\t\t  scanning-based reclamation is used for heavy pressure.\n  99:\t\n 100:\tconfig DAMON_LRU_SORT\n 101:\t\tbool \"Build DAMON-based LRU-lists sorting (DAMON_LRU_SORT)\"\n 102:\t\tdepends on DAMON_PADDR\n 103:\t\thelp\n 104:\t\t  This builds the DAMON-based LRU-lists sorting subsystem.  It tries to\n 105:\t\t  protect frequently accessed (hot) pages while rarely accessed (cold)\n 106:\t\t  pages reclaimed first under memory pressure.\n 107:\t\n 108:\tconfig DAMON_STAT\n 109:\t\tbool \"Build data access monitoring stat (DAMON_STAT)\"\n 110:\t\tdepends on DAMON_PADDR\n 111:\t\thelp\n 112:\t\t  This builds the DAMON-based access monitoring statistics subsystem.\n 113:\t\t  It runs DAMON and expose access monitoring results in simple stat\n 114:\t\t  metrics.\n 115:\t\n 116:\tconfig DAMON_STAT_ENABLED_DEFAULT\n 117:\t\tbool \"Enable DAMON_STAT by default\"\n 118:\t\tdepends on DAMON_STAT\n 119:\t\tdefault DAMON_STAT\n 120:\t\thelp\n 121:\t\t  Whether to enable DAMON_STAT by default.  Users can disable it in\n 122:\t\t  boot or runtime using its 'enabled' parameter.\n 123:\t\n 124:\tendmenu\n"
}
27/2 2026/09/02 23:42 llm patch-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 54779
							output: 223
							thoughts: 208

Thoughts: 
**DAMON Kernel Change Review**

Okay, time to make sure I haven't missed anything crucial on this DAMON patch. Let's run through it systematically. The change is in `mm/damon/core.c`, specifically the `damos_set_effective_quota` function. The key here is the conditional `esz = 0` if `!quota->esz_bp`. This looks like a functional, core-level kernel change related to how DAMON calculates effective quotas. That's immediately interesting; quota calculation changes can have performance implications, so I want to be thorough.

I need to confirm the relevant configurations. It relies on the usual suspects: `DAMON`, `DAMON_SYSFS`, `DAMON_PADDR`, and `DAMON_VADDR`. I'll want to keep those in mind as I assess the potential impact.

Next, the focus symbols. I'll need to pay close attention to the following functions: `damon_start`, `damon_commit_ctx`, `damon_set_schemes`, `damon_new_scheme`, `damos_commit_quota_goals`, `damos_new_quota_goal`, `damos_add_quota_goal`, `damos_sysfs_set_quota_scores`, and `damos_sysfs_update_effective_quotas`. These seem to be the critical interfaces and data paths involved in this quota management and update process. I'll need to trace the flow of data through those.

Finally, the `WorthFuzzing: true` flag. Good. That's a strong indicator that this change warrants robust fuzzing. I'll be sure to include it in the fuzzing plans.

Alright, that's everything. Time to call `set-results` and log the findings.

28/2 2026/09/02 23:42 tool set-results
0m Args: 
{
  "EnableConfigs": [
    "DAMON",
    "DAMON_SYSFS",
    "DAMON_PADDR",
    "DAMON_VADDR"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_commit_ctx",
    "damon_set_schemes",
    "damon_new_scheme",
    "damos_commit_quota_goals",
    "damos_new_quota_goal",
    "damos_add_quota_goal",
    "damos_sysfs_set_quota_scores",
    "damos_sysfs_update_effective_quotas"
  ],
  "Reasoning": "The patch alters the effective quota calculation logic in DAMON (Data Access Monitoring Framework) by explicitly setting the effective scheme size quota to 0 if esz_bp is 0. This changes DAMOS scheme quota enforcement and autotuning behavior, making it functionally impactful and worth fuzzing via the DAMON sysfs / kernel interfaces.",
  "WorthFuzzing": true
}

Results: 
{
  "EnableConfigs": [
    "DAMON",
    "DAMON_SYSFS",
    "DAMON_PADDR",
    "DAMON_VADDR"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_commit_ctx",
    "damon_set_schemes",
    "damon_new_scheme",
    "damos_commit_quota_goals",
    "damos_new_quota_goal",
    "damos_add_quota_goal",
    "damos_sysfs_set_quota_scores",
    "damos_sysfs_update_effective_quotas"
  ],
  "Reasoning": "The patch alters the effective quota calculation logic in DAMON (Data Access Monitoring Framework) by explicitly setting the effective scheme size quota to 0 if esz_bp is 0. This changes DAMOS scheme quota enforcement and autotuning behavior, making it functionally impactful and worth fuzzing via the DAMON sysfs / kernel interfaces.",
  "WorthFuzzing": true
}
29/1 2026/09/02 23:42 action If
0m Args: 
{
  "WorthFuzzing": true
}

Results: 
null
30/2 2026/09/02 23:42 agent kmsan-evaluator
0m Model: 
core

Args: 
null

Results: 
{
  "KMSANReasoning": "The patch modifies the calculation of the effective quota (`esz`) in DAMOS (`damos_set_effective_quota` in `mm/damon/core.c`) by resetting `esz` to 0 if `quota-\u003eesz_bp` is 0. This is purely an arithmetic / logic adjustment for DAMON quota management. It does not introduce or modify any uninitialized memory allocations, stack/heap buffers, branching on uninitialized variables, or user-space copy operations that could leak uninitialized bytes. Thus, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

Instruction: 
You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.

CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
  a comprehensive suite of debugging tools and sanitizers, including KASAN
  (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
  (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
  or page allocations) and kernel-to-user memory info-leaks.

Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.

Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.

Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
   attributes, ioctl output arguments, socket options, or BPF buffers) where fields
   or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
   or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
   could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
   uninitialized bytes of existing buffers.

Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
  dereferences, locking deadlocks, or use-after-free bugs (these are already caught
  by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
  or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.

Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Prompt: 
For your convenience, here is the diff of the changes:
commit 83818fd34c053b1914b52cfcb9126fd8736d1d01
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Sep 2 23:41:39 2026 +0000

    syz-cluster: applied patch under review

diff --git a/mm/damon/core.c b/mm/damon/core.c
index df22621765911..73dc9a70fb12b 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -3251,6 +3251,9 @@ static void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)
 	if (quota->sz && quota->sz < esz)
 		esz = quota->sz;
 
+	if (!quota->esz_bp)
+		esz = 0;
+
 	quota->esz = esz;
 }

31/3 2026/09/02 23:42 llm kmsan-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 2049
							output: 37
							thoughts: 245

Thoughts: 
**My Assessment of the DAMON Patch**

Okay, here's what I'm seeing with this DAMON patch. It's a pretty straightforward change, really. Looking at the `diff`, it's clear that the main focus is around the `damos_set_effective_quota` function in `mm/damon/core.c`. I'm going to take a look at the surrounding code to understand the context.

The patch itself is adding a simple check: `if (!quota->esz_bp) esz = 0;`  Right, so it looks like the variable `esz` is some kind of effective size calculation. The existing code already considers `quota->sz`, ensuring the effective size doesn't exceed the quota size. This new condition is probably a safeguard, meaning that if the backing pointer for effective size is null, it should be defaulted to zero.

I need to dig into `damos_set_effective_quota` and how `esz_bp`, `esz`, and `quota` are used to fully grasp the implication. The function calculates an effective quota size, likely to control memory usage or some resource allocation within the DAMON context. My guess is that the backing pointer is used to dynamically adjust the effective size. Without it, the effective size should be zeroed.

I need to understand what `quota->esz_bp` represents to determine the complete impact, but from the immediate context this feels like a defensive programming measure.

32/3 2026/09/02 23:42 tool read-file
0m Args: 
{
  "File": "mm/damon/core.c",
  "FirstLine": 3230,
  "LineCount": 40
}

Results: 
{
  "Contents": "3230:\t\t\treturn;\n3231:\t\t}\n3232:\t\n3233:\t\tif (!list_empty(\u0026quota-\u003egoals)) {\n3234:\t\t\tif (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_CONSIST)\n3235:\t\t\t\tdamos_goal_tune_esz_bp_consist(ctx, s);\n3236:\t\t\telse if (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_TEMPORAL)\n3237:\t\t\t\tdamos_goal_tune_esz_bp_temporal(ctx, s);\n3238:\t\t\tesz = quota-\u003eesz_bp / 10000;\n3239:\t\t}\n3240:\t\n3241:\t\tif (quota-\u003ems) {\n3242:\t\t\tif (quota-\u003etotal_charged_ns)\n3243:\t\t\t\tthroughput = mult_frac(quota-\u003etotal_charged_sz,\n3244:\t\t\t\t\t\t1000000, quota-\u003etotal_charged_ns);\n3245:\t\t\telse\n3246:\t\t\t\tthroughput = PAGE_SIZE * 1024;\n3247:\t\t\tesz = min(throughput * quota-\u003ems, esz);\n3248:\t\t\tesz = max(ctx-\u003emin_region_sz, esz);\n3249:\t\t}\n3250:\t\n3251:\t\tif (quota-\u003esz \u0026\u0026 quota-\u003esz \u003c esz)\n3252:\t\t\tesz = quota-\u003esz;\n3253:\t\n3254:\t\tif (!quota-\u003eesz_bp)\n3255:\t\t\tesz = 0;\n3256:\t\n3257:\t\tquota-\u003eesz = esz;\n3258:\t}\n3259:\t\n3260:\tstatic void damos_trace_esz(struct damon_ctx *c, struct damos *s,\n3261:\t\t\tstruct damos_quota *quota)\n3262:\t{\n3263:\t\tunsigned int cidx = 0, sidx = 0;\n3264:\t\tstruct damos *siter;\n3265:\t\n3266:\t\tdamon_for_each_scheme(siter, c) {\n3267:\t\t\tif (siter == s)\n3268:\t\t\t\tbreak;\n3269:\t\t\tsidx++;\n"
}
33/3 2026/09/02 23:42 llm kmsan-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 3253
							output: 37
							thoughts: 29

Thoughts: 
Here's my take on the thought process, as requested:

**Diving into `damos_set_effective_quota`**

Okay, time to get my hands dirty. I need to understand the complete context of `damos_set_effective_quota`, specifically starting at line 3215. Let me grab the code and take a look at the whole function. I'm not just interested in that specific line, I want to see the surrounding logic, any calls it makes, how it's being used, and what its overall purpose within the system is. Understanding the flow of the entire function is critical to grasping its behavior, potential issues, and optimization opportunities. Knowing this, I can begin to diagnose or modify it with confidence.

34/3 2026/09/02 23:42 tool read-file
0m Args: 
{
  "File": "mm/damon/core.c",
  "FirstLine": 3200,
  "LineCount": 40
}

Results: 
{
  "Contents": "3200:\t\n3201:\t\tquota-\u003eesz_bp = damon_feed_loop_next_input(\n3202:\t\t\t\tmax(quota-\u003eesz_bp, 10000UL), score);\n3203:\t}\n3204:\t\n3205:\tstatic void damos_goal_tune_esz_bp_temporal(struct damon_ctx *c,\n3206:\t\t\tstruct damos *s)\n3207:\t{\n3208:\t\tstruct damos_quota *quota = \u0026s-\u003equota;\n3209:\t\tunsigned long score = damos_quota_score(c, s);\n3210:\t\n3211:\t\tif (score \u003e= 10000)\n3212:\t\t\tquota-\u003eesz_bp = 0;\n3213:\t\telse if (quota-\u003esz)\n3214:\t\t\tquota-\u003eesz_bp = quota-\u003esz * 10000;\n3215:\t\telse\n3216:\t\t\tquota-\u003eesz_bp = ULONG_MAX;\n3217:\t}\n3218:\t\n3219:\t/*\n3220:\t * Called only if quota-\u003ems, or quota-\u003esz are set, or quota-\u003egoals is not empty\n3221:\t */\n3222:\tstatic void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)\n3223:\t{\n3224:\t\tstruct damos_quota *quota = \u0026s-\u003equota;\n3225:\t\tunsigned long throughput;\n3226:\t\tunsigned long esz = ULONG_MAX;\n3227:\t\n3228:\t\tif (!quota-\u003ems \u0026\u0026 list_empty(\u0026quota-\u003egoals)) {\n3229:\t\t\tquota-\u003eesz = quota-\u003esz;\n3230:\t\t\treturn;\n3231:\t\t}\n3232:\t\n3233:\t\tif (!list_empty(\u0026quota-\u003egoals)) {\n3234:\t\t\tif (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_CONSIST)\n3235:\t\t\t\tdamos_goal_tune_esz_bp_consist(ctx, s);\n3236:\t\t\telse if (quota-\u003egoal_tuner == DAMOS_QUOTA_GOAL_TUNER_TEMPORAL)\n3237:\t\t\t\tdamos_goal_tune_esz_bp_temporal(ctx, s);\n3238:\t\t\tesz = quota-\u003eesz_bp / 10000;\n3239:\t\t}\n"
}
35/3 2026/09/02 23:42 llm kmsan-evaluator
0m Model: 
gemini-3.7-flash

Args: 
null

Results: 
null

Tokens: 
							input: 4129
							output: 145
							thoughts: 406

Thoughts: 
**My Assessment of the `damos_goal_tune_esz_bp_temporal` Change**

Okay, let's break this down. From what I see, the `damos_goal_tune_esz_bp_temporal` function is playing with a memory quota, specifically setting `quota->esz_bp` to zero if the `score` hits 10000 or more. Then, it looks like `quota->ms` comes into play, potentially raising the `esz` value, but there's a guardrail: if `esz_bp` is zero, `esz` gets pinned to zero as well. That’s the core logic.

Now, the important part: Does this introduce any memory safety issues? Let's go through the checklist.

1.  **Kernel-User Space Communication:** Nope. No new kernel structures are being sent to user space where uninitialized fields could be a problem. This is internal kernel stuff.
2.  **Uninitialized Variable Dependence:** No, `quota->esz_bp` is initialized during the DAMON scheme quota setup, so we don't have to worry about uninitialized variables causing issues in conditional logic.
3.  **Complex Data Structure Initialization:** Nope. This isn't about allocating or initializing complex data structures where uninitialized fields could be a problem later.
4.  **Buffer Access:** Not here. This isn't about bounds checking or accessing parts of buffers that haven't been initialized. It's just number crunching.

So, am I seeing any real uninitialized memory risks? No. The `quota` fields are managed within the kernel's DAMON subsystem, initialized during creation and configuration. It's just arithmetic and quota calculation. This is precisely the kind of thing that KMSAN (Kernel Memory Sanitizer) would flag, and it's not applicable here.

Therefore, my conclusion is that `NeedsKMSAN` should be `false`. I've double-checked everything, so I'm ready to move forward.

36/3 2026/09/02 23:42 tool set-results
0m Args: 
{
  "KMSANReasoning": "The patch modifies the calculation of the effective quota (`esz`) in DAMOS (`damos_set_effective_quota` in `mm/damon/core.c`) by resetting `esz` to 0 if `quota-\u003eesz_bp` is 0. This is purely an arithmetic / logic adjustment for DAMON quota management. It does not introduce or modify any uninitialized memory allocations, stack/heap buffers, branching on uninitialized variables, or user-space copy operations that could leak uninitialized bytes. Thus, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

Results: 
{
  "KMSANReasoning": "The patch modifies the calculation of the effective quota (`esz`) in DAMOS (`damos_set_effective_quota` in `mm/damon/core.c`) by resetting `esz` to 0 if `quota-\u003eesz_bp` is 0. This is purely an arithmetic / logic adjustment for DAMON quota management. It does not introduce or modify any uninitialized memory allocations, stack/heap buffers, branching on uninitialized variables, or user-space copy operations that could leak uninitialized bytes. Thus, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}
LLM Calls Summary:
Total Calls Total Tokens Avg Tokens Total Duration (Seconds) Avg Duration (Seconds)
Tool Calls Summary:
Total Calls Total Duration (Seconds) Avg Duration (Seconds)