AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/07/06 21:05	flow	patch-triage	2m Args: null Results: { "EnableConfigs": [ "DAMON", "DAMON_VADDR", "DAMON_PADDR", "DAMON_SYSFS", "DAMON_RECLAIM", "DAMON_LRU_SORT", "SAMPLE_DAMON_WSSE", "SAMPLE_DAMON_PRCL", "SAMPLE_DAMON_MTIER" ], "FocusSymbols": [ "damon_start", "damon_stop", "damon_call", "damon_lru_sort_turn", "damon_reclaim_turn", "damon_sysfs_turn_damon_off" ], "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.", "WorthFuzzing": true }
1/1	2026/07/06 21:05	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit db188d92679277ed80c7921d19879bf531921fc8\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Mon Jul 6 21:05:46 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/include/linux/damon.h b/include/linux/damon.h\nindex 2661231c0ae82e..19b7e839bde0b4 100644\n--- a/include/linux/damon.h\n+++ b/include/linux/damon.h\n@@ -1070,7 +1070,7 @@ static inline unsigned int damon_max_nr_accesses(const struct damon_attrs attrs\n \n bool damon_initialized(void);\n int damon_start(struct damon_ctx ctxs, int nr_ctxs, bool exclusive);\n-int damon_stop(struct damon_ctx ctxs, int nr_ctxs);\n+void damon_stop(struct damon_ctx ctxs, int nr_ctxs);\n bool damon_is_running(struct damon_ctx ctx);\n int damon_kdamond_pid(struct damon_ctx ctx);\n \ndiff --git a/mm/damon/core.c b/mm/damon/core.c\nindex 3c5a46e1c079a3..390e00b3685efc 100644\n--- a/mm/damon/core.c\n+++ b/mm/damon/core.c\n@@ -1917,16 +1917,17 @@ int damon_start(struct damon_ctx ctxs, int nr_ctxs, bool exclusive)\n \t\trunning_exclusive_ctxs = true;\n \tmutex_unlock(\u0026damon_lock);\n \n+\tif (i != nr_ctxs)\n+\t\tdamon_stop(ctxs, i);\n+\n \treturn err;\n }\n \n /\n * __damon_stop() - Stops monitoring of a given context.\n * @ctx:\tmonitoring context\n- \n- Return: 0 on success, negative error code otherwise.\n /\n-static int __damon_stop(struct damon_ctx ctx)\n+static void __damon_stop(struct damon_ctx ctx)\n {\n \tstruct task_struct tsk;\n \n@@ -1936,31 +1937,23 @@ static int __damon_stop(struct damon_ctx ctx)\n \t\tget_task_struct(tsk);\n \t\tmutex_unlock(\u0026ctx-\u003ekdamond_lock);\n \t\tkthread_stop_put(tsk);\n-\t\treturn 0;\n+\t\treturn;\n \t}\n \tmutex_unlock(\u0026ctx-\u003ekdamond_lock);\n-\n-\treturn -EPERM;\n }\n \n /\n damon_stop() - Stops the monitorings for a given group of contexts.\n * @ctxs:\tan array of the pointers for contexts to stop monitoring\n * @nr_ctxs:\tsize of @ctxs\n- \n- Return: 0 on success, negative error code otherwise.\n /\n-int damon_stop(struct damon_ctx ctxs, int nr_ctxs)\n+void damon_stop(struct damon_ctx ctxs, int nr_ctxs)\n {\n-\tint i, err = 0;\n+\tint i;\n \n-\tfor (i = 0; i \u003c nr_ctxs; i++) {\n+\tfor (i = 0; i \u003c nr_ctxs; i++)\n \t\t/ nr_running_ctxs is decremented in kdamond_fn /\n-\t\terr = __damon_stop(ctxs[i]);\n-\t\tif (err)\n-\t\t\tbreak;\n-\t}\n-\treturn err;\n+\t\t__damon_stop(ctxs[i]);\n }\n \n /\n@@ -2017,6 +2010,8 @@ int damon_kdamond_pid(struct damon_ctx ctx)\n * @ctx has succeeded. Otherwise, this function could fall into an indefinite\n * wait.\n \n+ When this function is failed, the @ctx is guaranteed to be stopped.\n+ \n Return: 0 on success, negative error code otherwise.\n /\n int damon_call(struct damon_ctx ctx, struct damon_call_control control)\n@@ -2029,7 +2024,7 @@ int damon_call(struct damon_ctx ctx, struct damon_call_control control)\n \tmutex_lock(\u0026ctx-\u003ecall_controls_lock);\n \tif (ctx-\u003ecall_controls_obsolete) {\n \t\tmutex_unlock(\u0026ctx-\u003ecall_controls_lock);\n-\t\treturn -ECANCELED;\n+\t\tgoto canceled;\n \t}\n \tlist_add_tail(\u0026control-\u003elist, \u0026ctx-\u003ecall_controls);\n \tmutex_unlock(\u0026ctx-\u003ecall_controls_lock);\n@@ -2037,8 +2032,14 @@ int damon_call(struct damon_ctx ctx, struct damon_call_control control)\n \t\treturn 0;\n \twait_for_completion(\u0026control-\u003ecompletion);\n \tif (control-\u003ecanceled)\n-\t\treturn -ECANCELED;\n+\t\tgoto canceled;\n \treturn 0;\n+\n+canceled:\n+\twhile (damon_is_running(ctx))\n+\t\tschedule_timeout_idle(msecs_to_jiffies(100));\n+\treturn -ECANCELED;\n+\n }\n \n /\ndiff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c\nindex 2dd0cd0d262731..e8c389ad3226f7 100644\n--- a/mm/damon/lru_sort.c\n+++ b/mm/damon/lru_sort.c\n@@ -409,8 +409,10 @@ static int damon_lru_sort_turn(bool on)\n {\n \tint err;\n \n-\tif (!on)\n-\t\treturn damon_stop(\u0026ctx, 1);\n+\tif (!on) {\n+\t\tdamon_stop(\u0026ctx, 1);\n+\t\treturn 0;\n+\t}\n \n \terr = damon_lru_sort_apply_parameters();\n \tif (err)\ndiff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c\nindex 6469b25cc34f92..09e941d75f67dd 100644\n--- a/mm/damon/reclaim.c\n+++ b/mm/damon/reclaim.c\n@@ -332,8 +332,10 @@ static int damon_reclaim_turn(bool on)\n {\n \tint err;\n \n-\tif (!on)\n-\t\treturn damon_stop(\u0026ctx, 1);\n+\tif (!on) {\n+\t\tdamon_stop(\u0026ctx, 1);\n+\t\treturn 0;\n+\t}\n \n \terr = damon_reclaim_apply_parameters();\n \tif (err)\ndiff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c\nindex b65651498e0d14..6d7e36c9e509d2 100644\n--- a/mm/damon/sysfs.c\n+++ b/mm/damon/sysfs.c\n@@ -2262,12 +2262,13 @@ static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond kdamond)\n {\n \tif (!kdamond-\u003edamon_ctx)\n \t\treturn -EINVAL;\n-\treturn damon_stop(\u0026kdamond-\u003edamon_ctx, 1);\n+\tdamon_stop(\u0026kdamond-\u003edamon_ctx, 1);\n \t/\n \t To allow users show final monitoring results of already turned-off\n \t * DAMON, we free kdamond-\u003edamon_ctx in next\n \t * damon_sysfs_turn_damon_on(), or kdamonds_nr_store()\n \t /\n+\treturn 0;\n }\n \n static int damon_sysfs_damon_call(int (fn)(void *data),\ndiff --git a/samples/damon/mtier.c b/samples/damon/mtier.c\nindex e567f4edd80ea7..ac9c24b92ead84 100644\n--- a/samples/damon/mtier.c\n+++ b/samples/damon/mtier.c\n@@ -193,8 +193,6 @@ static int damon_sample_mtier_start(void)\n \tif (!err)\n \t\treturn 0;\n \n-\tif (damon_is_running(ctxs[0]))\n-\t\tdamon_stop(ctxs, 1);\n \tdamon_destroy_ctx(ctxs[0]);\n \tdamon_destroy_ctx(ctxs[1]);\n \treturn err;\n@@ -202,8 +200,7 @@ static int damon_sample_mtier_start(void)\n \n static void damon_sample_mtier_stop(void)\n {\n-\tdamon_stop(ctxs, 1);\n-\tdamon_stop(\u0026ctxs[1], 1);\n+\tdamon_stop(ctxs, 2);\n \tdamon_destroy_ctx(ctxs[0]);\n \tdamon_destroy_ctx(ctxs[1]);\n }\ndiff --git a/samples/damon/prcl.c b/samples/damon/prcl.c\nindex edeae145c4a8af..842099bd622861 100644\n--- a/samples/damon/prcl.c\n+++ b/samples/damon/prcl.c\n@@ -113,10 +113,8 @@ static int damon_sample_prcl_start(void)\n \n \trepeat_call_control.data = ctx;\n \terr = damon_call(ctx, \u0026repeat_call_control);\n-\tif (err) {\n-\t\tdamon_stop(\u0026ctx, 1);\n+\tif (err)\n \t\tdamon_destroy_ctx(ctx);\n-\t}\n \treturn err;\n }\n \ndiff --git a/samples/damon/wsse.c b/samples/damon/wsse.c\nindex ff5e8a890f448c..37fd5da2015885 100644\n--- a/samples/damon/wsse.c\n+++ b/samples/damon/wsse.c\n@@ -93,10 +93,8 @@ static int damon_sample_wsse_start(void)\n \t}\n \trepeat_call_control.data = ctx;\n \terr = damon_call(ctx, \u0026repeat_call_control);\n-\tif (err) {\n-\t\tdamon_stop(\u0026ctx, 1);\n+\tif (err)\n \t\tdamon_destroy_ctx(ctx);\n-\t}\n \treturn err;\n }\n \n" }
2/1	2026/07/06 21:05	agent	patch-evaluator	2m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": [ "DAMON", "DAMON_VADDR", "DAMON_PADDR", "DAMON_SYSFS", "DAMON_RECLAIM", "DAMON_LRU_SORT", "SAMPLE_DAMON_WSSE", "SAMPLE_DAMON_PRCL", "SAMPLE_DAMON_MTIER" ], "FocusSymbols": [ "damon_start", "damon_stop", "damon_call", "damon_lru_sort_turn", "damon_reclaim_turn", "damon_sysfs_turn_damon_off" ], "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.", "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). 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. 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. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. 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 db188d92679277ed80c7921d19879bf531921fc8 Author: syz-cluster <triage@syzkaller.com> Date: Mon Jul 6 21:05:46 2026 +0000 syz-cluster: applied patch under review diff --git a/include/linux/damon.h b/include/linux/damon.h index 2661231c0ae82e..19b7e839bde0b4 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -1070,7 +1070,7 @@ static inline unsigned int damon_max_nr_accesses(const struct damon_attrs attrs bool damon_initialized(void); int damon_start(struct damon_ctx ctxs, int nr_ctxs, bool exclusive); -int damon_stop(struct damon_ctx ctxs, int nr_ctxs); +void damon_stop(struct damon_ctx ctxs, int nr_ctxs); bool damon_is_running(struct damon_ctx ctx); int damon_kdamond_pid(struct damon_ctx ctx); diff --git a/mm/damon/core.c b/mm/damon/core.c index 3c5a46e1c079a3..390e00b3685efc 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1917,16 +1917,17 @@ int damon_start(struct damon_ctx ctxs, int nr_ctxs, bool exclusive) running_exclusive_ctxs = true; mutex_unlock(&damon_lock); + if (i != nr_ctxs) + damon_stop(ctxs, i); + return err; } / * __damon_stop() - Stops monitoring of a given context. * @ctx: monitoring context - * - * Return: 0 on success, negative error code otherwise. / -static int __damon_stop(struct damon_ctx ctx) +static void __damon_stop(struct damon_ctx ctx) { struct task_struct tsk; @@ -1936,31 +1937,23 @@ static int __damon_stop(struct damon_ctx ctx) get_task_struct(tsk); mutex_unlock(&ctx->kdamond_lock); kthread_stop_put(tsk); - return 0; + return; } mutex_unlock(&ctx->kdamond_lock); - - return -EPERM; } /* * damon_stop() - Stops the monitorings for a given group of contexts. * @ctxs: an array of the pointers for contexts to stop monitoring * @nr_ctxs: size of @ctxs - * - * Return: 0 on success, negative error code otherwise. / -int damon_stop(struct damon_ctx ctxs, int nr_ctxs) +void damon_stop(struct damon_ctx ctxs, int nr_ctxs) { - int i, err = 0; + int i; - for (i = 0; i < nr_ctxs; i++) { + for (i = 0; i < nr_ctxs; i++) / nr_running_ctxs is decremented in kdamond_fn / - err = __damon_stop(ctxs[i]); - if (err) - break; - } - return err; + __damon_stop(ctxs[i]); } /* @@ -2017,6 +2010,8 @@ int damon_kdamond_pid(struct damon_ctx ctx) @ctx has succeeded. Otherwise, this function could fall into an indefinite * wait. * + * When this function is failed, the @ctx is guaranteed to be stopped. + * * Return: 0 on success, negative error code otherwise. / int damon_call(struct damon_ctx ctx, struct damon_call_control control) @@ -2029,7 +2024,7 @@ int damon_call(struct damon_ctx ctx, struct damon_call_control control) mutex_lock(&ctx->call_controls_lock); if (ctx->call_controls_obsolete) { mutex_unlock(&ctx->call_controls_lock); - return -ECANCELED; + goto canceled; } list_add_tail(&control->list, &ctx->call_controls); mutex_unlock(&ctx->call_controls_lock); @@ -2037,8 +2032,14 @@ int damon_call(struct damon_ctx ctx, struct damon_call_control control) return 0; wait_for_completion(&control->completion); if (control->canceled) - return -ECANCELED; + goto canceled; return 0; + +canceled: + while (damon_is_running(ctx)) + schedule_timeout_idle(msecs_to_jiffies(100)); + return -ECANCELED; + } /* diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c index 2dd0cd0d262731..e8c389ad3226f7 100644 --- a/mm/damon/lru_sort.c +++ b/mm/damon/lru_sort.c @@ -409,8 +409,10 @@ static int damon_lru_sort_turn(bool on) { int err; - if (!on) - return damon_stop(&ctx, 1); + if (!on) { + damon_stop(&ctx, 1); + return 0; + } err = damon_lru_sort_apply_parameters(); if (err) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 6469b25cc34f92..09e941d75f67dd 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -332,8 +332,10 @@ static int damon_reclaim_turn(bool on) { int err; - if (!on) - return damon_stop(&ctx, 1); + if (!on) { + damon_stop(&ctx, 1); + return 0; + } err = damon_reclaim_apply_parameters(); if (err) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index b65651498e0d14..6d7e36c9e509d2 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -2262,12 +2262,13 @@ static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond kdamond) { if (!kdamond->damon_ctx) return -EINVAL; - return damon_stop(&kdamond->damon_ctx, 1); + damon_stop(&kdamond->damon_ctx, 1); / * To allow users show final monitoring results of already turned-off * DAMON, we free kdamond->damon_ctx in next * damon_sysfs_turn_damon_on(), or kdamonds_nr_store() / + return 0; } static int damon_sysfs_damon_call(int (fn)(void *data), diff --git a/samples/damon/mtier.c b/samples/damon/mtier.c index e567f4edd80ea7..ac9c24b92ead84 100644 --- a/samples/damon/mtier.c +++ b/samples/damon/mtier.c @@ -193,8 +193,6 @@ static int damon_sample_mtier_start(void) if (!err) return 0; - if (damon_is_running(ctxs[0])) - damon_stop(ctxs, 1); damon_destroy_ctx(ctxs[0]); damon_destroy_ctx(ctxs[1]); return err; @@ -202,8 +200,7 @@ static int damon_sample_mtier_start(void) static void damon_sample_mtier_stop(void) { - damon_stop(ctxs, 1); - damon_stop(&ctxs[1], 1); + damon_stop(ctxs, 2); damon_destroy_ctx(ctxs[0]); damon_destroy_ctx(ctxs[1]); } diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c index edeae145c4a8af..842099bd622861 100644 --- a/samples/damon/prcl.c +++ b/samples/damon/prcl.c @@ -113,10 +113,8 @@ static int damon_sample_prcl_start(void) repeat_call_control.data = ctx; err = damon_call(ctx, &repeat_call_control); - if (err) { - damon_stop(&ctx, 1); + if (err) damon_destroy_ctx(ctx); - } return err; } diff --git a/samples/damon/wsse.c b/samples/damon/wsse.c index ff5e8a890f448c..37fd5da2015885 100644 --- a/samples/damon/wsse.c +++ b/samples/damon/wsse.c @@ -93,10 +93,8 @@ static int damon_sample_wsse_start(void) } repeat_call_control.data = ctx; err = damon_call(ctx, &repeat_call_control); - if (err) { - damon_stop(&ctx, 1); + if (err) damon_destroy_ctx(ctx); - } return err; }
3/2	2026/07/06 21:05	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4408 output: 25 thoughts: 252 Thoughts: My Assessment of the DAMON Patch Okay, so I've got this patch here that’s tweaking the Data Access Monitor (DAMON) subsystem within the Linux kernel. Seems pretty straightforward: they're changing the return type of `damon_stop` to `void` instead of `int`, and adjusting `damon_call` to handle context stopping more gracefully if the call is canceled. Fine. They've also updated the callers of `damon_stop` across the codebase – `lru_sort.c`, `reclaim.c`, `sysfs.c`, and several sample files. Given my knowledge of the kernel, I can confirm that DAMON itself is definitely reachable and functional; it's a critical component in memory management, so it has to be. The changes are reachable and functional as the patch summary indicates. My gut feeling is this is a relatively low-risk modification, but it's dealing with a core component, so we need to be thorough. I'd definitely want to fuzz this. It's time to check what the relevant CONFIG options are for DAMON. My best bet is to use `grepper` and search `mm/damon/Kconfig` or `mm/Kconfig` for `CONFIG_DAMON` or anything similar to make sure I understand the full configuration context.
4/2	2026/07/06 21:06	tool	grepper	0m Args: { "Expression": "config DAMON", "PathPrefix": "mm/" } 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" }
5/2	2026/07/06 21:06	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5719 output: 29 thoughts: 138 Thoughts: Analyzing the DAMON Patch Okay, so I'm looking at this DAMON patch, and my initial thought is to zero in on the key configurations involved. I need to understand what's being tweaked. I see we have DAMON itself, and then specific configurations related to virtual and physical addresses (`DAMON_VADDR`, `DAMON_PADDR`), the system file system interface (`DAMON_SYSFS`), reclaim behavior (`DAMON_RECLAIM`), and LRU sorting (`DAMON_LRU_SORT`). This gives me a good starting point to assess the scope of the changes. Next, I need to look at the meat of the code. I'll need to focus on the functions that have been modified. The patch touches `damon_start`, `__damon_stop`, `damon_stop`, `damon_call`, `damon_lru_sort_turn`, `damon_reclaim_turn`, and `damon_sysfs_turn_damon_off`. I'll want to trace the execution flow and interactions between these functions. Specifically, I should check the implementation of `damon_call` and `damon_stop` and then see how they are used.
6/2	2026/07/06 21:06	tool	grepper	0m Args: { "Expression": "damon_call", "PathPrefix": "mm/damon/" } Results: { "Output": "mm/damon/core.c=959=static bool damon_valid_intervals_goal(struct damon_attrs attrs)\n--\nmm/damon/core.c-985- setup of damon_ctx before calling damon_start(). Some of the API callers\nmm/damon/core.c:986: * also indirectly call this function via damon_call() -\u003e damon_commit() for\nmm/damon/core.c-987- * online parameters updates. Finally, kdamond_fn() itself use this for\n--\nmm/damon/core.c=1085=static void damos_commit_quota_goal(\n--\nmm/damon/core.c-1105- * This function should be called from parameters-update safe context, like\nmm/damon/core.c:1106: * damon_call().\nmm/damon/core.c-1107- /\n--\nmm/damon/core.c=1722=static struct damon_ctx damon_new_test_ctx(struct damon_ctx dst)\n--\nmm/damon/core.c-1748- This function should be called from parameters-update safe context, like\nmm/damon/core.c:1749: * damon_call().\nmm/damon/core.c-1750- /\n--\nmm/damon/core.c=1981=int damon_kdamond_pid(struct damon_ctx ctx)\n--\nmm/damon/core.c-1992-/*\nmm/damon/core.c:1993: damon_call() - Invoke a given function on DAMON worker thread (kdamond).\nmm/damon/core.c-1994- * @ctx:\tDAMON context to call the function for.\n--\nmm/damon/core.c-1997- * Ask DAMON worker thread (kdamond) of @ctx to call a function with an\nmm/damon/core.c:1998: * argument data that respectively passed via \u0026damon_call_control-\u003efn and\nmm/damon/core.c:1999: * \u0026damon_call_control-\u003edata of @control. If \u0026damon_call_control-\u003erepeat of\nmm/damon/core.c-2000- * @control is unset, further wait until the kdamond finishes handling of the\n--\nmm/damon/core.c-2006- * synchronization. The return value of the function will be saved in\nmm/damon/core.c:2007: * \u0026damon_call_control-\u003ereturn_code.\nmm/damon/core.c-2008- \n--\nmm/damon/core.c-2016- /\nmm/damon/core.c:2017:int damon_call(struct damon_ctx ctx, struct damon_call_control control)\nmm/damon/core.c-2018-{\n--\nmm/damon/core.c=3527=static void damon_verify_ctx(struct damon_ctx c)\n--\nmm/damon/core.c-3532-/\nmm/damon/core.c:3533: * kdamond_call() - handle damon_call_control objects.\nmm/damon/core.c-3534- * @ctx:\tThe \u0026struct damon_ctx of the kdamond.\n--\nmm/damon/core.c-3536- \nmm/damon/core.c:3537: If there are \u0026struct damon_call_control requests that registered via\nmm/damon/core.c:3538: * \u0026damon_call() on @ctx, do or cancel the invocation of the function depending\nmm/damon/core.c-3539- * on @cancel. @cancel is set when the kdamond is already out of the main loop\n--\nmm/damon/core.c=3542=static void kdamond_call(struct damon_ctx ctx, bool cancel)\nmm/damon/core.c-3543-{\nmm/damon/core.c:3544:\tstruct damon_call_control control, next;\nmm/damon/core.c-3545-\tLIST_HEAD(controls);\n--\nmm/damon/core.c=3626=static int kdamond_fn(void data)\n--\nmm/damon/core.c-3695-\t\t\tkdamond_usleep(ctx-\u003eattrs.sample_interval);\nmm/damon/core.c:3696:\t\t\t/* allow caller unset pause via damon_call() /\nmm/damon/core.c-3697-\t\t\tkdamond_call(ctx, false);\n--\nmm/damon/lru_sort.c=347=static int damon_lru_sort_commit_inputs_store(const char val,\n--\nmm/damon/lru_sort.c-351-\tint err;\nmm/damon/lru_sort.c:352:\tstruct damon_call_control control = {\nmm/damon/lru_sort.c-353-\t\t.fn = damon_lru_sort_commit_inputs_fn,\n--\nmm/damon/lru_sort.c-367-\t/\nmm/damon/lru_sort.c:368:\t Skip damon_call() if ctx is not initialized to avoid\nmm/damon/lru_sort.c-369-\t * NULL pointer dereference.\n--\nmm/damon/lru_sort.c-373-\nmm/damon/lru_sort.c:374:\terr = damon_call(ctx, \u0026control);\nmm/damon/lru_sort.c-375-\n--\nmm/damon/lru_sort.c=385=module_param_cb(commit_inputs, \u0026commit_inputs_param_ops, \u0026commit_inputs, 0600);\nmm/damon/lru_sort.c-386-\nmm/damon/lru_sort.c:387:static int damon_lru_sort_damon_call_fn(void arg)\nmm/damon/lru_sort.c-388-{\n--\nmm/damon/lru_sort.c-402-\nmm/damon/lru_sort.c:403:static struct damon_call_control call_control = {\nmm/damon/lru_sort.c:404:\t.fn = damon_lru_sort_damon_call_fn,\nmm/damon/lru_sort.c-405-\t.repeat = true,\n--\nmm/damon/lru_sort.c=408=static int damon_lru_sort_turn(bool on)\n--\nmm/damon/lru_sort.c-423-\t\treturn err;\nmm/damon/lru_sort.c:424:\treturn damon_call(ctx, \u0026call_control);\nmm/damon/lru_sort.c-425-}\n--\nmm/damon/reclaim.c=274=static int damon_reclaim_commit_inputs_store(const char val,\n--\nmm/damon/reclaim.c-278-\tint err;\nmm/damon/reclaim.c:279:\tstruct damon_call_control control = {\nmm/damon/reclaim.c-280-\t\t.fn = damon_reclaim_commit_inputs_fn,\n--\nmm/damon/reclaim.c-294-\t/\nmm/damon/reclaim.c:295:\t Skip damon_call() if ctx is not initialized to avoid\nmm/damon/reclaim.c-296-\t * NULL pointer dereference.\n--\nmm/damon/reclaim.c-300-\nmm/damon/reclaim.c:301:\terr = damon_call(ctx, \u0026control);\nmm/damon/reclaim.c-302-\n--\nmm/damon/reclaim.c=312=module_param_cb(commit_inputs, \u0026commit_inputs_param_ops, \u0026commit_inputs, 0600);\nmm/damon/reclaim.c-313-\nmm/damon/reclaim.c:314:static int damon_reclaim_damon_call_fn(void arg)\nmm/damon/reclaim.c-315-{\n--\nmm/damon/reclaim.c-325-\nmm/damon/reclaim.c:326:static struct damon_call_control call_control = {\nmm/damon/reclaim.c:327:\t.fn = damon_reclaim_damon_call_fn,\nmm/damon/reclaim.c-328-\t.repeat = true,\n--\nmm/damon/reclaim.c=331=static int damon_reclaim_turn(bool on)\n--\nmm/damon/reclaim.c-346-\t\treturn err;\nmm/damon/reclaim.c:347:\treturn damon_call(ctx, \u0026call_control);\nmm/damon/reclaim.c-348-}\n--\nmm/damon/stat.c=113=static void damon_stat_set_idletime_percentiles(struct damon_ctx c)\n--\nmm/damon/stat.c-134-\nmm/damon/stat.c:135:static int damon_stat_damon_call_fn(void data)\nmm/damon/stat.c-136-{\n--\nmm/damon/stat.c=151=static struct damon_ctx damon_stat_build_ctx(void)\n--\nmm/damon/stat.c-194-\nmm/damon/stat.c:195:static struct damon_call_control call_control = {\nmm/damon/stat.c:196:\t.fn = damon_stat_damon_call_fn,\nmm/damon/stat.c-197-\t.repeat = true,\n--\nmm/damon/stat.c=200=static int damon_stat_start(void)\n--\nmm/damon/stat.c-221-\tcall_control.data = damon_stat_context;\nmm/damon/stat.c:222:\treturn damon_call(damon_stat_context, \u0026call_control);\nmm/damon/stat.c-223-}\n--\nmm/damon/sysfs.c=2216=static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond kdamond)\n--\nmm/damon/sysfs.c-2218-\tstruct damon_ctx ctx;\nmm/damon/sysfs.c:2219:\tstruct damon_call_control repeat_call_control;\nmm/damon/sysfs.c-2220-\tint err;\n--\nmm/damon/sysfs.c-2255-\trepeat_call_control-\u003edealloc_on_cancel = true;\nmm/damon/sysfs.c:2256:\tif (damon_call(ctx, repeat_call_control))\nmm/damon/sysfs.c-2257-\t\tkfree(repeat_call_control);\n--\nmm/damon/sysfs.c=2261=static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond kdamond)\n--\nmm/damon/sysfs.c-2273-\nmm/damon/sysfs.c:2274:static int damon_sysfs_damon_call(int (fn)(void data),\nmm/damon/sysfs.c-2275-\t\tstruct damon_sysfs_kdamond *kdamond)\nmm/damon/sysfs.c-2276-{\nmm/damon/sysfs.c:2277:\tstruct damon_call_control call_control = {};\nmm/damon/sysfs.c-2278-\tint err;\n--\nmm/damon/sysfs.c-2283-\tcall_control.data = kdamond;\nmm/damon/sysfs.c:2284:\terr = damon_call(kdamond-\u003edamon_ctx, \u0026call_control);\nmm/damon/sysfs.c-2285-\treturn err ? err : call_control.return_code;\n--\nmm/damon/sysfs.c=2337=static int damon_sysfs_handle_cmd(enum damon_sysfs_cmd cmd,\n--\nmm/damon/sysfs.c-2348-\tcase DAMON_SYSFS_CMD_COMMIT:\nmm/damon/sysfs.c:2349:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2350-\t\t\t\tdamon_sysfs_commit_input, kdamond);\nmm/damon/sysfs.c-2351-\tcase DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS:\nmm/damon/sysfs.c:2352:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2353-\t\t\t\tdamon_sysfs_commit_schemes_quota_goals,\n--\nmm/damon/sysfs.c-2355-\tcase DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS:\nmm/damon/sysfs.c:2356:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2357-\t\t\t\tdamon_sysfs_upd_schemes_stats, kdamond);\n--\nmm/damon/sysfs.c-2365-\tcase DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS:\nmm/damon/sysfs.c:2366:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2367-\t\t\t\tdamon_sysfs_upd_schemes_effective_quotas,\n--\nmm/damon/sysfs.c-2369-\tcase DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS:\nmm/damon/sysfs.c:2370:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2371-\t\t\t\tdamon_sysfs_upd_tuned_intervals, kdamond);\n" }
7/2	2026/07/06 21:06	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9893 output: 27 thoughts: 177 Thoughts: DAMON Kernel Module Update - Initial Assessment Okay, so I see we have some updates concentrated within the DAMON subsystem, specifically touching `mm/damon/core.c`, `mm/damon/lru_sort.c`, `mm/damon/reclaim.c`, and `mm/damon/sysfs.c`. Looks like we're refining DAMON's core functionality. The modifications are spread across the lifecycle management, with changes to `damon_start`, `__damon_stop`, `damon_stop`, and `damon_call`. We've also got some tuning in the operational loop with `damon_lru_sort_turn`, `damon_reclaim_turn`, and a sysfs update, `damon_sysfs_turn_damon_off`. Interesting. Looks like we're getting more control and potentially more efficient memory monitoring and management. Now, let's see which features we're bringing online. The config changes include enabling `DAMON`, `DAMON_VADDR`, `DAMON_PADDR`, `DAMON_SYSFS`, `DAMON_RECLAIM`, and `DAMON_LRU_SORT`. This confirms we're aiming for a comprehensive DAMON implementation, handling both virtual and physical addresses, integrated with the sysfs interface, and employing reclaim and LRU-based sorting strategies. Before diving into the code itself, let me quickly glance at the `samples/damon/` directory. That should give me a good handle on how these new configurations are intended to be used and any example workflows.
8/2	2026/07/06 21:06	tool	grepper	0m Args: { "Expression": "config SAMPLE_DAMON", "PathPrefix": "samples/" } Results: { "Output": "samples/damon/Kconfig=3=menu \"DAMON Samples\"\nsamples/damon/Kconfig-4-\nsamples/damon/Kconfig:5:config SAMPLE_DAMON_WSSE\nsamples/damon/Kconfig-6-\tbool \"DAMON sample module for working set size estimation\"\n--\nsamples/damon/Kconfig-16-\nsamples/damon/Kconfig:17:config SAMPLE_DAMON_PRCL\nsamples/damon/Kconfig-18-\tbool \"DAMON sample module for access-aware proactive reclamation\"\n--\nsamples/damon/Kconfig-29-\nsamples/damon/Kconfig:30:config SAMPLE_DAMON_MTIER\nsamples/damon/Kconfig-31-\tbool \"DAMON sample module for memory tiering\"\n" }
9/2	2026/07/06 21:06	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10642 output: 31 thoughts: 434 Thoughts: My DAMON Configuration Check Okay, so I need to update the DAMON configs. I'm going to add `SAMPLE_DAMON_WSSE`, `SAMPLE_DAMON_PRCL`, and `SAMPLE_DAMON_MTIER`. Now, regarding the focus symbols, I'm going to work with `damon_start`, `damon_stop`, `damon_call`, `damon_lru_sort_turn`, `damon_reclaim_turn`, and `damon_sysfs_turn_damon_off`. I'll keep an eye out for other relevant functions, although I know `__damon_stop` is static and isn't something I can directly focus on. `damon_stop` calls that function, so I'm not overlooking it. I'm also looking at the existing configs. I noticed `DAMON_STAT`, but the patch didn't touch `mm/damon/stat.c` even though `damon_stat_start` calls `damon_call`. The patch changes: `include/linux/damon.h`, `mm/damon/core.c`, `mm/damon/lru_sort.c`, `mm/damon/reclaim.c`, `mm/damon/sysfs.c`, and the samples (`samples/damon/mtier.c`, `samples/damon/prcl.c`, `samples/damon/wsse.c`). So, I'm dealing with `DAMON`, `DAMON_VADDR`, `DAMON_PADDR`, `DAMON_SYSFS`, `DAMON_RECLAIM`, `DAMON_LRU_SORT`, along with the new samples. I'll need to confirm that `DAMON_VADDR` and `DAMON_PADDR` are still required, since they are essential for virtual and physical address space operations, and are usually needed for DAMON to function. I'll do a final check to make sure I've got everything.
10/2	2026/07/06 21:06	tool	grepper	0m Args: { "Expression": "depends on DAMON", "PathPrefix": "mm/damon/Kconfig" } Results: { "Output": "mm/damon/Kconfig=15=config DAMON_DEBUG_SANITY\nmm/damon/Kconfig-16-\tbool \"Check sanity of DAMON code\"\nmm/damon/Kconfig:17:\tdepends on DAMON\nmm/damon/Kconfig-18-\thelp\n--\nmm/damon/Kconfig=26=config DAMON_KUNIT_TEST\nmm/damon/Kconfig-27-\tbool \"Test for damon\" if !KUNIT_ALL_TESTS\nmm/damon/Kconfig:28:\tdepends on DAMON \u0026\u0026 KUNIT=y\nmm/damon/Kconfig-29-\tdefault KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig=38=config DAMON_VADDR\nmm/damon/Kconfig-39-\tbool \"Data access monitoring operations for virtual address spaces\"\nmm/damon/Kconfig:40:\tdepends on DAMON \u0026\u0026 MMU\nmm/damon/Kconfig-41-\tselect PAGE_IDLE_FLAG\n--\nmm/damon/Kconfig=47=config DAMON_PADDR\nmm/damon/Kconfig-48-\tbool \"Data access monitoring operations for the physical address space\"\nmm/damon/Kconfig:49:\tdepends on DAMON \u0026\u0026 MMU\nmm/damon/Kconfig-50-\tselect PAGE_IDLE_FLAG\n--\nmm/damon/Kconfig=56=config DAMON_VADDR_KUNIT_TEST\nmm/damon/Kconfig-57-\tbool \"Test for DAMON operations\" if !KUNIT_ALL_TESTS\nmm/damon/Kconfig:58:\tdepends on DAMON_VADDR \u0026\u0026 KUNIT=y\nmm/damon/Kconfig-59-\tdefault KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig=68=config DAMON_SYSFS\nmm/damon/Kconfig-69-\tbool \"DAMON sysfs interface\"\nmm/damon/Kconfig:70:\tdepends on DAMON \u0026\u0026 SYSFS\nmm/damon/Kconfig-71-\tdefault DAMON\n--\nmm/damon/Kconfig=76=config DAMON_SYSFS_KUNIT_TEST\nmm/damon/Kconfig-77-\tbool \"Test for damon sysfs interface\" if !KUNIT_ALL_TESTS\nmm/damon/Kconfig:78:\tdepends on DAMON_SYSFS \u0026\u0026 KUNIT=y\nmm/damon/Kconfig-79-\tdefault KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig=88=config DAMON_RECLAIM\nmm/damon/Kconfig-89-\tbool \"Build DAMON-based reclaim (DAMON_RECLAIM)\"\nmm/damon/Kconfig:90:\tdepends on DAMON_PADDR\nmm/damon/Kconfig-91-\thelp\n--\nmm/damon/Kconfig=100=config DAMON_LRU_SORT\nmm/damon/Kconfig-101-\tbool \"Build DAMON-based LRU-lists sorting (DAMON_LRU_SORT)\"\nmm/damon/Kconfig:102:\tdepends on DAMON_PADDR\nmm/damon/Kconfig-103-\thelp\n--\nmm/damon/Kconfig=108=config DAMON_STAT\nmm/damon/Kconfig-109-\tbool \"Build data access monitoring stat (DAMON_STAT)\"\nmm/damon/Kconfig:110:\tdepends on DAMON_PADDR\nmm/damon/Kconfig-111-\thelp\n--\nmm/damon/Kconfig=116=config DAMON_STAT_ENABLED_DEFAULT\nmm/damon/Kconfig-117-\tbool \"Enable DAMON_STAT by default\"\nmm/damon/Kconfig:118:\tdepends on DAMON_STAT\nmm/damon/Kconfig-119-\tdefault DAMON_STAT\n" }
11/2	2026/07/06 21:06	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12525 output: 29 thoughts: 87 Thoughts: Here's my thought process, as an expert in this area: Analyzing DAMON Kconfig Dependencies Alright, let's break down these DAMON Kconfig dependencies. It's clear that both `DAMON_RECLAIM` and `DAMON_LRU_SORT` are built upon the foundation of `DAMON_PADDR`. This makes sense – reclaiming and sorting based on LRU typically require physical address considerations. Moving on, the presence of `DAMON_SYSFS` is contingent on the availability of both `DAMON` itself and the `SYSFS` infrastructure. That's standard practice for exposing control interfaces. Now, `DAMON_VADDR` and `DAMON_PADDR` both seem to depend on `DAMON` and the `MMU`. This suggests that virtual and physical address manipulation within DAMON requires the MMU's functionality, which is no surprise really. To gain further insight, let's take a closer look at `samples/damon/Kconfig` to see the complete picture of how everything fits together in the actual kernel configuration files.
12/2	2026/07/06 21:06	tool	grepper	0m Args: { "Expression": "depends on", "PathPrefix": "samples/damon/Kconfig" } Results: { "Output": "samples/damon/Kconfig=5=config SAMPLE_DAMON_WSSE\nsamples/damon/Kconfig-6-\tbool \"DAMON sample module for working set size estimation\"\nsamples/damon/Kconfig:7:\tdepends on DAMON \u0026\u0026 DAMON_VADDR\nsamples/damon/Kconfig-8-\thelp\n--\nsamples/damon/Kconfig=17=config SAMPLE_DAMON_PRCL\nsamples/damon/Kconfig-18-\tbool \"DAMON sample module for access-aware proactive reclamation\"\nsamples/damon/Kconfig:19:\tdepends on DAMON \u0026\u0026 DAMON_VADDR\nsamples/damon/Kconfig-20-\thelp\n--\nsamples/damon/Kconfig=30=config SAMPLE_DAMON_MTIER\nsamples/damon/Kconfig-31-\tbool \"DAMON sample module for memory tiering\"\nsamples/damon/Kconfig:32:\tdepends on DAMON \u0026\u0026 DAMON_PADDR\nsamples/damon/Kconfig-33-\thelp\n" }
13/2	2026/07/06 21:06	llm	patch-evaluator	1m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13130 output: 237 thoughts: 215 Thoughts: Analyzing the DAMON Configuration and Patch Okay, let's break this down. First, I'm seeing a list of DAMON configuration symbols: `DAMON`, `DAMON_VADDR`, `DAMON_PADDR`, `DAMON_SYSFS`, `DAMON_RECLAIM`, `DAMON_LRU_SORT`, and then a few sample symbols: `SAMPLE_DAMON_WSSE`, `SAMPLE_DAMON_PRCL`, and `SAMPLE_DAMON_MTIER`. Nothing unexpected there – these are the knobs we'd expect to see to control DAMON's behavior and features. Now, focusing on the core symbols: `damon_start`, `damon_stop`, `damon_call`, `damon_lru_sort_turn`, `damon_reclaim_turn`, and `damon_sysfs_turn_damon_off`. These are the entry points and control points. I need to understand how the patch is impacting these specific functions. Aha! The patch modifies `damon_stop`. It changes the return type to `void`, meaning no error code is being returned anymore. Furthermore, the behavior has been altered in such a way that it no longer returns an error code, which implies a change in how errors are handled, or perhaps a simplification of the error handling strategy. It also states that `damon_call` now waits for the context to stop if the call is cancelled. Yes, this represents a significant, functional change to the very core of DAMON's logic. It could affect how we manage error states and how we handle asynchronous operations. I'm going to want to deeply analyze the impact of this change on the overall system behavior, error propagation, and any potential race conditions introduced by the changes. Now that I understand the core of the change, I'm going to proceed to call `set-results`.
14/2	2026/07/06 21:08	tool	set-results	0m Args: { "EnableConfigs": [ "DAMON", "DAMON_VADDR", "DAMON_PADDR", "DAMON_SYSFS", "DAMON_RECLAIM", "DAMON_LRU_SORT", "SAMPLE_DAMON_WSSE", "SAMPLE_DAMON_PRCL", "SAMPLE_DAMON_MTIER" ], "FocusSymbols": [ "damon_start", "damon_stop", "damon_call", "damon_lru_sort_turn", "damon_reclaim_turn", "damon_sysfs_turn_damon_off" ], "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "DAMON", "DAMON_VADDR", "DAMON_PADDR", "DAMON_SYSFS", "DAMON_RECLAIM", "DAMON_LRU_SORT", "SAMPLE_DAMON_WSSE", "SAMPLE_DAMON_PRCL", "SAMPLE_DAMON_MTIER" ], "FocusSymbols": [ "damon_start", "damon_stop", "damon_call", "damon_lru_sort_turn", "damon_reclaim_turn", "damon_sysfs_turn_damon_off" ], "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.", "WorthFuzzing": true }

{
  "EnableConfigs": [
    "DAMON",
    "DAMON_VADDR",
    "DAMON_PADDR",
    "DAMON_SYSFS",
    "DAMON_RECLAIM",
    "DAMON_LRU_SORT",
    "SAMPLE_DAMON_WSSE",
    "SAMPLE_DAMON_PRCL",
    "SAMPLE_DAMON_MTIER"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_stop",
    "damon_call",
    "damon_lru_sort_turn",
    "damon_reclaim_turn",
    "damon_sysfs_turn_damon_off"
  ],
  "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

{
  "PatchDiff": "commit db188d92679277ed80c7921d19879bf531921fc8\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Jul 6 21:05:46 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/include/linux/damon.h b/include/linux/damon.h\nindex 2661231c0ae82e..19b7e839bde0b4 100644\n--- a/include/linux/damon.h\n+++ b/include/linux/damon.h\n@@ -1070,7 +1070,7 @@ static inline unsigned int damon_max_nr_accesses(const struct damon_attrs *attrs\n \n bool damon_initialized(void);\n int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive);\n-int damon_stop(struct damon_ctx **ctxs, int nr_ctxs);\n+void damon_stop(struct damon_ctx **ctxs, int nr_ctxs);\n bool damon_is_running(struct damon_ctx *ctx);\n int damon_kdamond_pid(struct damon_ctx *ctx);\n \ndiff --git a/mm/damon/core.c b/mm/damon/core.c\nindex 3c5a46e1c079a3..390e00b3685efc 100644\n--- a/mm/damon/core.c\n+++ b/mm/damon/core.c\n@@ -1917,16 +1917,17 @@ int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive)\n \t\trunning_exclusive_ctxs = true;\n \tmutex_unlock(\u0026damon_lock);\n \n+\tif (i != nr_ctxs)\n+\t\tdamon_stop(ctxs, i);\n+\n \treturn err;\n }\n \n /*\n  * __damon_stop() - Stops monitoring of a given context.\n  * @ctx:\tmonitoring context\n- *\n- * Return: 0 on success, negative error code otherwise.\n  */\n-static int __damon_stop(struct damon_ctx *ctx)\n+static void __damon_stop(struct damon_ctx *ctx)\n {\n \tstruct task_struct *tsk;\n \n@@ -1936,31 +1937,23 @@ static int __damon_stop(struct damon_ctx *ctx)\n \t\tget_task_struct(tsk);\n \t\tmutex_unlock(\u0026ctx-\u003ekdamond_lock);\n \t\tkthread_stop_put(tsk);\n-\t\treturn 0;\n+\t\treturn;\n \t}\n \tmutex_unlock(\u0026ctx-\u003ekdamond_lock);\n-\n-\treturn -EPERM;\n }\n \n /**\n  * damon_stop() - Stops the monitorings for a given group of contexts.\n  * @ctxs:\tan array of the pointers for contexts to stop monitoring\n  * @nr_ctxs:\tsize of @ctxs\n- *\n- * Return: 0 on success, negative error code otherwise.\n  */\n-int damon_stop(struct damon_ctx **ctxs, int nr_ctxs)\n+void damon_stop(struct damon_ctx **ctxs, int nr_ctxs)\n {\n-\tint i, err = 0;\n+\tint i;\n \n-\tfor (i = 0; i \u003c nr_ctxs; i++) {\n+\tfor (i = 0; i \u003c nr_ctxs; i++)\n \t\t/* nr_running_ctxs is decremented in kdamond_fn */\n-\t\terr = __damon_stop(ctxs[i]);\n-\t\tif (err)\n-\t\t\tbreak;\n-\t}\n-\treturn err;\n+\t\t__damon_stop(ctxs[i]);\n }\n \n /**\n@@ -2017,6 +2010,8 @@ int damon_kdamond_pid(struct damon_ctx *ctx)\n  * @ctx has succeeded.  Otherwise, this function could fall into an indefinite\n  * wait.\n  *\n+ * When this function is failed, the @ctx is guaranteed to be stopped.\n+ *\n  * Return: 0 on success, negative error code otherwise.\n  */\n int damon_call(struct damon_ctx *ctx, struct damon_call_control *control)\n@@ -2029,7 +2024,7 @@ int damon_call(struct damon_ctx *ctx, struct damon_call_control *control)\n \tmutex_lock(\u0026ctx-\u003ecall_controls_lock);\n \tif (ctx-\u003ecall_controls_obsolete) {\n \t\tmutex_unlock(\u0026ctx-\u003ecall_controls_lock);\n-\t\treturn -ECANCELED;\n+\t\tgoto canceled;\n \t}\n \tlist_add_tail(\u0026control-\u003elist, \u0026ctx-\u003ecall_controls);\n \tmutex_unlock(\u0026ctx-\u003ecall_controls_lock);\n@@ -2037,8 +2032,14 @@ int damon_call(struct damon_ctx *ctx, struct damon_call_control *control)\n \t\treturn 0;\n \twait_for_completion(\u0026control-\u003ecompletion);\n \tif (control-\u003ecanceled)\n-\t\treturn -ECANCELED;\n+\t\tgoto canceled;\n \treturn 0;\n+\n+canceled:\n+\twhile (damon_is_running(ctx))\n+\t\tschedule_timeout_idle(msecs_to_jiffies(100));\n+\treturn -ECANCELED;\n+\n }\n \n /**\ndiff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c\nindex 2dd0cd0d262731..e8c389ad3226f7 100644\n--- a/mm/damon/lru_sort.c\n+++ b/mm/damon/lru_sort.c\n@@ -409,8 +409,10 @@ static int damon_lru_sort_turn(bool on)\n {\n \tint err;\n \n-\tif (!on)\n-\t\treturn damon_stop(\u0026ctx, 1);\n+\tif (!on) {\n+\t\tdamon_stop(\u0026ctx, 1);\n+\t\treturn 0;\n+\t}\n \n \terr = damon_lru_sort_apply_parameters();\n \tif (err)\ndiff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c\nindex 6469b25cc34f92..09e941d75f67dd 100644\n--- a/mm/damon/reclaim.c\n+++ b/mm/damon/reclaim.c\n@@ -332,8 +332,10 @@ static int damon_reclaim_turn(bool on)\n {\n \tint err;\n \n-\tif (!on)\n-\t\treturn damon_stop(\u0026ctx, 1);\n+\tif (!on) {\n+\t\tdamon_stop(\u0026ctx, 1);\n+\t\treturn 0;\n+\t}\n \n \terr = damon_reclaim_apply_parameters();\n \tif (err)\ndiff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c\nindex b65651498e0d14..6d7e36c9e509d2 100644\n--- a/mm/damon/sysfs.c\n+++ b/mm/damon/sysfs.c\n@@ -2262,12 +2262,13 @@ static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond)\n {\n \tif (!kdamond-\u003edamon_ctx)\n \t\treturn -EINVAL;\n-\treturn damon_stop(\u0026kdamond-\u003edamon_ctx, 1);\n+\tdamon_stop(\u0026kdamond-\u003edamon_ctx, 1);\n \t/*\n \t * To allow users show final monitoring results of already turned-off\n \t * DAMON, we free kdamond-\u003edamon_ctx in next\n \t * damon_sysfs_turn_damon_on(), or kdamonds_nr_store()\n \t */\n+\treturn 0;\n }\n \n static int damon_sysfs_damon_call(int (*fn)(void *data),\ndiff --git a/samples/damon/mtier.c b/samples/damon/mtier.c\nindex e567f4edd80ea7..ac9c24b92ead84 100644\n--- a/samples/damon/mtier.c\n+++ b/samples/damon/mtier.c\n@@ -193,8 +193,6 @@ static int damon_sample_mtier_start(void)\n \tif (!err)\n \t\treturn 0;\n \n-\tif (damon_is_running(ctxs[0]))\n-\t\tdamon_stop(ctxs, 1);\n \tdamon_destroy_ctx(ctxs[0]);\n \tdamon_destroy_ctx(ctxs[1]);\n \treturn err;\n@@ -202,8 +200,7 @@ static int damon_sample_mtier_start(void)\n \n static void damon_sample_mtier_stop(void)\n {\n-\tdamon_stop(ctxs, 1);\n-\tdamon_stop(\u0026ctxs[1], 1);\n+\tdamon_stop(ctxs, 2);\n \tdamon_destroy_ctx(ctxs[0]);\n \tdamon_destroy_ctx(ctxs[1]);\n }\ndiff --git a/samples/damon/prcl.c b/samples/damon/prcl.c\nindex edeae145c4a8af..842099bd622861 100644\n--- a/samples/damon/prcl.c\n+++ b/samples/damon/prcl.c\n@@ -113,10 +113,8 @@ static int damon_sample_prcl_start(void)\n \n \trepeat_call_control.data = ctx;\n \terr = damon_call(ctx, \u0026repeat_call_control);\n-\tif (err) {\n-\t\tdamon_stop(\u0026ctx, 1);\n+\tif (err)\n \t\tdamon_destroy_ctx(ctx);\n-\t}\n \treturn err;\n }\n \ndiff --git a/samples/damon/wsse.c b/samples/damon/wsse.c\nindex ff5e8a890f448c..37fd5da2015885 100644\n--- a/samples/damon/wsse.c\n+++ b/samples/damon/wsse.c\n@@ -93,10 +93,8 @@ static int damon_sample_wsse_start(void)\n \t}\n \trepeat_call_control.data = ctx;\n \terr = damon_call(ctx, \u0026repeat_call_control);\n-\tif (err) {\n-\t\tdamon_stop(\u0026ctx, 1);\n+\tif (err)\n \t\tdamon_destroy_ctx(ctx);\n-\t}\n \treturn err;\n }\n \n"
}

gemini-3.1-pro-preview

{
  "EnableConfigs": [
    "DAMON",
    "DAMON_VADDR",
    "DAMON_PADDR",
    "DAMON_SYSFS",
    "DAMON_RECLAIM",
    "DAMON_LRU_SORT",
    "SAMPLE_DAMON_WSSE",
    "SAMPLE_DAMON_PRCL",
    "SAMPLE_DAMON_MTIER"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_stop",
    "damon_call",
    "damon_lru_sort_turn",
    "damon_reclaim_turn",
    "damon_sysfs_turn_damon_off"
  ],
  "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

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).

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.
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.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. 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.

For your convenience, here is the diff of the changes:
commit db188d92679277ed80c7921d19879bf531921fc8
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Jul 6 21:05:46 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 2661231c0ae82e..19b7e839bde0b4 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -1070,7 +1070,7 @@ static inline unsigned int damon_max_nr_accesses(const struct damon_attrs *attrs
 
 bool damon_initialized(void);
 int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive);
-int damon_stop(struct damon_ctx **ctxs, int nr_ctxs);
+void damon_stop(struct damon_ctx **ctxs, int nr_ctxs);
 bool damon_is_running(struct damon_ctx *ctx);
 int damon_kdamond_pid(struct damon_ctx *ctx);
 
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 3c5a46e1c079a3..390e00b3685efc 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1917,16 +1917,17 @@ int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive)
 		running_exclusive_ctxs = true;
 	mutex_unlock(&damon_lock);
 
+	if (i != nr_ctxs)
+		damon_stop(ctxs, i);
+
 	return err;
 }
 
 /*
  * __damon_stop() - Stops monitoring of a given context.
  * @ctx:	monitoring context
- *
- * Return: 0 on success, negative error code otherwise.
  */
-static int __damon_stop(struct damon_ctx *ctx)
+static void __damon_stop(struct damon_ctx *ctx)
 {
 	struct task_struct *tsk;
 
@@ -1936,31 +1937,23 @@ static int __damon_stop(struct damon_ctx *ctx)
 		get_task_struct(tsk);
 		mutex_unlock(&ctx->kdamond_lock);
 		kthread_stop_put(tsk);
-		return 0;
+		return;
 	}
 	mutex_unlock(&ctx->kdamond_lock);
-
-	return -EPERM;
 }
 
 /**
  * damon_stop() - Stops the monitorings for a given group of contexts.
  * @ctxs:	an array of the pointers for contexts to stop monitoring
  * @nr_ctxs:	size of @ctxs
- *
- * Return: 0 on success, negative error code otherwise.
  */
-int damon_stop(struct damon_ctx **ctxs, int nr_ctxs)
+void damon_stop(struct damon_ctx **ctxs, int nr_ctxs)
 {
-	int i, err = 0;
+	int i;
 
-	for (i = 0; i < nr_ctxs; i++) {
+	for (i = 0; i < nr_ctxs; i++)
 		/* nr_running_ctxs is decremented in kdamond_fn */
-		err = __damon_stop(ctxs[i]);
-		if (err)
-			break;
-	}
-	return err;
+		__damon_stop(ctxs[i]);
 }
 
 /**
@@ -2017,6 +2010,8 @@ int damon_kdamond_pid(struct damon_ctx *ctx)
  * @ctx has succeeded.  Otherwise, this function could fall into an indefinite
  * wait.
  *
+ * When this function is failed, the @ctx is guaranteed to be stopped.
+ *
  * Return: 0 on success, negative error code otherwise.
  */
 int damon_call(struct damon_ctx *ctx, struct damon_call_control *control)
@@ -2029,7 +2024,7 @@ int damon_call(struct damon_ctx *ctx, struct damon_call_control *control)
 	mutex_lock(&ctx->call_controls_lock);
 	if (ctx->call_controls_obsolete) {
 		mutex_unlock(&ctx->call_controls_lock);
-		return -ECANCELED;
+		goto canceled;
 	}
 	list_add_tail(&control->list, &ctx->call_controls);
 	mutex_unlock(&ctx->call_controls_lock);
@@ -2037,8 +2032,14 @@ int damon_call(struct damon_ctx *ctx, struct damon_call_control *control)
 		return 0;
 	wait_for_completion(&control->completion);
 	if (control->canceled)
-		return -ECANCELED;
+		goto canceled;
 	return 0;
+
+canceled:
+	while (damon_is_running(ctx))
+		schedule_timeout_idle(msecs_to_jiffies(100));
+	return -ECANCELED;
+
 }
 
 /**
diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
index 2dd0cd0d262731..e8c389ad3226f7 100644
--- a/mm/damon/lru_sort.c
+++ b/mm/damon/lru_sort.c
@@ -409,8 +409,10 @@ static int damon_lru_sort_turn(bool on)
 {
 	int err;
 
-	if (!on)
-		return damon_stop(&ctx, 1);
+	if (!on) {
+		damon_stop(&ctx, 1);
+		return 0;
+	}
 
 	err = damon_lru_sort_apply_parameters();
 	if (err)
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 6469b25cc34f92..09e941d75f67dd 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -332,8 +332,10 @@ static int damon_reclaim_turn(bool on)
 {
 	int err;
 
-	if (!on)
-		return damon_stop(&ctx, 1);
+	if (!on) {
+		damon_stop(&ctx, 1);
+		return 0;
+	}
 
 	err = damon_reclaim_apply_parameters();
 	if (err)
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index b65651498e0d14..6d7e36c9e509d2 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -2262,12 +2262,13 @@ static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond)
 {
 	if (!kdamond->damon_ctx)
 		return -EINVAL;
-	return damon_stop(&kdamond->damon_ctx, 1);
+	damon_stop(&kdamond->damon_ctx, 1);
 	/*
 	 * To allow users show final monitoring results of already turned-off
 	 * DAMON, we free kdamond->damon_ctx in next
 	 * damon_sysfs_turn_damon_on(), or kdamonds_nr_store()
 	 */
+	return 0;
 }
 
 static int damon_sysfs_damon_call(int (*fn)(void *data),
diff --git a/samples/damon/mtier.c b/samples/damon/mtier.c
index e567f4edd80ea7..ac9c24b92ead84 100644
--- a/samples/damon/mtier.c
+++ b/samples/damon/mtier.c
@@ -193,8 +193,6 @@ static int damon_sample_mtier_start(void)
 	if (!err)
 		return 0;
 
-	if (damon_is_running(ctxs[0]))
-		damon_stop(ctxs, 1);
 	damon_destroy_ctx(ctxs[0]);
 	damon_destroy_ctx(ctxs[1]);
 	return err;
@@ -202,8 +200,7 @@ static int damon_sample_mtier_start(void)
 
 static void damon_sample_mtier_stop(void)
 {
-	damon_stop(ctxs, 1);
-	damon_stop(&ctxs[1], 1);
+	damon_stop(ctxs, 2);
 	damon_destroy_ctx(ctxs[0]);
 	damon_destroy_ctx(ctxs[1]);
 }
diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c
index edeae145c4a8af..842099bd622861 100644
--- a/samples/damon/prcl.c
+++ b/samples/damon/prcl.c
@@ -113,10 +113,8 @@ static int damon_sample_prcl_start(void)
 
 	repeat_call_control.data = ctx;
 	err = damon_call(ctx, &repeat_call_control);
-	if (err) {
-		damon_stop(&ctx, 1);
+	if (err)
 		damon_destroy_ctx(ctx);
-	}
 	return err;
 }
 
diff --git a/samples/damon/wsse.c b/samples/damon/wsse.c
index ff5e8a890f448c..37fd5da2015885 100644
--- a/samples/damon/wsse.c
+++ b/samples/damon/wsse.c
@@ -93,10 +93,8 @@ static int damon_sample_wsse_start(void)
 	}
 	repeat_call_control.data = ctx;
 	err = damon_call(ctx, &repeat_call_control);
-	if (err) {
-		damon_stop(&ctx, 1);
+	if (err)
 		damon_destroy_ctx(ctx);
-	}
 	return err;
 }

gemini-3.1-pro-preview

							input: 4408
							output: 25
							thoughts: 252

**My Assessment of the DAMON Patch**

Okay, so I've got this patch here that’s tweaking the Data Access Monitor (DAMON) subsystem within the Linux kernel. Seems pretty straightforward: they're changing the return type of `damon_stop` to `void` instead of `int`, and adjusting `damon_call` to handle context stopping more gracefully if the call is canceled. Fine. They've also updated the callers of `damon_stop` across the codebase – `lru_sort.c`, `reclaim.c`, `sysfs.c`, and several sample files.

Given my knowledge of the kernel, I can confirm that DAMON itself is definitely reachable and functional; it's a critical component in memory management, so it has to be. The changes *are* reachable and functional as the patch summary indicates.

My gut feeling is this is a relatively low-risk modification, but it's dealing with a core component, so we need to be thorough. I'd definitely want to fuzz this. It's time to check what the relevant CONFIG options are for DAMON. My best bet is to use `grepper` and search `mm/damon/Kconfig` or `mm/Kconfig` for `CONFIG_DAMON` or anything similar to make sure I understand the full configuration context.

{
  "Expression": "config DAMON",
  "PathPrefix": "mm/"
}

{
  "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"
}

gemini-3.1-pro-preview

							input: 5719
							output: 29
							thoughts: 138

**Analyzing the DAMON Patch**

Okay, so I'm looking at this DAMON patch, and my initial thought is to zero in on the key configurations involved. I need to understand what's being tweaked. I see we have DAMON itself, and then specific configurations related to virtual and physical addresses (`DAMON_VADDR`, `DAMON_PADDR`), the system file system interface (`DAMON_SYSFS`), reclaim behavior (`DAMON_RECLAIM`), and LRU sorting (`DAMON_LRU_SORT`). This gives me a good starting point to assess the scope of the changes.

Next, I need to look at the meat of the code. I'll need to focus on the functions that have been modified. The patch touches `damon_start`, `__damon_stop`, `damon_stop`, `damon_call`, `damon_lru_sort_turn`, `damon_reclaim_turn`, and `damon_sysfs_turn_damon_off`. I'll want to trace the execution flow and interactions between these functions. Specifically, I should check the implementation of `damon_call` and `damon_stop` and then see how they are used.

{
  "Expression": "damon_call",
  "PathPrefix": "mm/damon/"
}

{
  "Output": "mm/damon/core.c=959=static bool damon_valid_intervals_goal(struct damon_attrs *attrs)\n--\nmm/damon/core.c-985- * setup of damon_ctx before calling damon_start().  Some of the API callers\nmm/damon/core.c:986: * also indirectly call this function via damon_call() -\u003e damon_commit() for\nmm/damon/core.c-987- * online parameters updates.  Finally, kdamond_fn() itself use this for\n--\nmm/damon/core.c=1085=static void damos_commit_quota_goal(\n--\nmm/damon/core.c-1105- * This function should be called from parameters-update safe context, like\nmm/damon/core.c:1106: * damon_call().\nmm/damon/core.c-1107- */\n--\nmm/damon/core.c=1722=static struct damon_ctx *damon_new_test_ctx(struct damon_ctx *dst)\n--\nmm/damon/core.c-1748- * This function should be called from parameters-update safe context, like\nmm/damon/core.c:1749: * damon_call().\nmm/damon/core.c-1750- */\n--\nmm/damon/core.c=1981=int damon_kdamond_pid(struct damon_ctx *ctx)\n--\nmm/damon/core.c-1992-/**\nmm/damon/core.c:1993: * damon_call() - Invoke a given function on DAMON worker thread (kdamond).\nmm/damon/core.c-1994- * @ctx:\tDAMON context to call the function for.\n--\nmm/damon/core.c-1997- * Ask DAMON worker thread (kdamond) of @ctx to call a function with an\nmm/damon/core.c:1998: * argument data that respectively passed via \u0026damon_call_control-\u003efn and\nmm/damon/core.c:1999: * \u0026damon_call_control-\u003edata of @control.  If \u0026damon_call_control-\u003erepeat of\nmm/damon/core.c-2000- * @control is unset, further wait until the kdamond finishes handling of the\n--\nmm/damon/core.c-2006- * synchronization.  The return value of the function will be saved in\nmm/damon/core.c:2007: * \u0026damon_call_control-\u003ereturn_code.\nmm/damon/core.c-2008- *\n--\nmm/damon/core.c-2016- */\nmm/damon/core.c:2017:int damon_call(struct damon_ctx *ctx, struct damon_call_control *control)\nmm/damon/core.c-2018-{\n--\nmm/damon/core.c=3527=static void damon_verify_ctx(struct damon_ctx *c)\n--\nmm/damon/core.c-3532-/*\nmm/damon/core.c:3533: * kdamond_call() - handle damon_call_control objects.\nmm/damon/core.c-3534- * @ctx:\tThe \u0026struct damon_ctx of the kdamond.\n--\nmm/damon/core.c-3536- *\nmm/damon/core.c:3537: * If there are \u0026struct damon_call_control requests that registered via\nmm/damon/core.c:3538: * \u0026damon_call() on @ctx, do or cancel the invocation of the function depending\nmm/damon/core.c-3539- * on @cancel.  @cancel is set when the kdamond is already out of the main loop\n--\nmm/damon/core.c=3542=static void kdamond_call(struct damon_ctx *ctx, bool cancel)\nmm/damon/core.c-3543-{\nmm/damon/core.c:3544:\tstruct damon_call_control *control, *next;\nmm/damon/core.c-3545-\tLIST_HEAD(controls);\n--\nmm/damon/core.c=3626=static int kdamond_fn(void *data)\n--\nmm/damon/core.c-3695-\t\t\tkdamond_usleep(ctx-\u003eattrs.sample_interval);\nmm/damon/core.c:3696:\t\t\t/* allow caller unset pause via damon_call() */\nmm/damon/core.c-3697-\t\t\tkdamond_call(ctx, false);\n--\nmm/damon/lru_sort.c=347=static int damon_lru_sort_commit_inputs_store(const char *val,\n--\nmm/damon/lru_sort.c-351-\tint err;\nmm/damon/lru_sort.c:352:\tstruct damon_call_control control = {\nmm/damon/lru_sort.c-353-\t\t.fn = damon_lru_sort_commit_inputs_fn,\n--\nmm/damon/lru_sort.c-367-\t/*\nmm/damon/lru_sort.c:368:\t * Skip damon_call() if ctx is not initialized to avoid\nmm/damon/lru_sort.c-369-\t * NULL pointer dereference.\n--\nmm/damon/lru_sort.c-373-\nmm/damon/lru_sort.c:374:\terr = damon_call(ctx, \u0026control);\nmm/damon/lru_sort.c-375-\n--\nmm/damon/lru_sort.c=385=module_param_cb(commit_inputs, \u0026commit_inputs_param_ops, \u0026commit_inputs, 0600);\nmm/damon/lru_sort.c-386-\nmm/damon/lru_sort.c:387:static int damon_lru_sort_damon_call_fn(void *arg)\nmm/damon/lru_sort.c-388-{\n--\nmm/damon/lru_sort.c-402-\nmm/damon/lru_sort.c:403:static struct damon_call_control call_control = {\nmm/damon/lru_sort.c:404:\t.fn = damon_lru_sort_damon_call_fn,\nmm/damon/lru_sort.c-405-\t.repeat = true,\n--\nmm/damon/lru_sort.c=408=static int damon_lru_sort_turn(bool on)\n--\nmm/damon/lru_sort.c-423-\t\treturn err;\nmm/damon/lru_sort.c:424:\treturn damon_call(ctx, \u0026call_control);\nmm/damon/lru_sort.c-425-}\n--\nmm/damon/reclaim.c=274=static int damon_reclaim_commit_inputs_store(const char *val,\n--\nmm/damon/reclaim.c-278-\tint err;\nmm/damon/reclaim.c:279:\tstruct damon_call_control control = {\nmm/damon/reclaim.c-280-\t\t.fn = damon_reclaim_commit_inputs_fn,\n--\nmm/damon/reclaim.c-294-\t/*\nmm/damon/reclaim.c:295:\t * Skip damon_call() if ctx is not initialized to avoid\nmm/damon/reclaim.c-296-\t * NULL pointer dereference.\n--\nmm/damon/reclaim.c-300-\nmm/damon/reclaim.c:301:\terr = damon_call(ctx, \u0026control);\nmm/damon/reclaim.c-302-\n--\nmm/damon/reclaim.c=312=module_param_cb(commit_inputs, \u0026commit_inputs_param_ops, \u0026commit_inputs, 0600);\nmm/damon/reclaim.c-313-\nmm/damon/reclaim.c:314:static int damon_reclaim_damon_call_fn(void *arg)\nmm/damon/reclaim.c-315-{\n--\nmm/damon/reclaim.c-325-\nmm/damon/reclaim.c:326:static struct damon_call_control call_control = {\nmm/damon/reclaim.c:327:\t.fn = damon_reclaim_damon_call_fn,\nmm/damon/reclaim.c-328-\t.repeat = true,\n--\nmm/damon/reclaim.c=331=static int damon_reclaim_turn(bool on)\n--\nmm/damon/reclaim.c-346-\t\treturn err;\nmm/damon/reclaim.c:347:\treturn damon_call(ctx, \u0026call_control);\nmm/damon/reclaim.c-348-}\n--\nmm/damon/stat.c=113=static void damon_stat_set_idletime_percentiles(struct damon_ctx *c)\n--\nmm/damon/stat.c-134-\nmm/damon/stat.c:135:static int damon_stat_damon_call_fn(void *data)\nmm/damon/stat.c-136-{\n--\nmm/damon/stat.c=151=static struct damon_ctx *damon_stat_build_ctx(void)\n--\nmm/damon/stat.c-194-\nmm/damon/stat.c:195:static struct damon_call_control call_control = {\nmm/damon/stat.c:196:\t.fn = damon_stat_damon_call_fn,\nmm/damon/stat.c-197-\t.repeat = true,\n--\nmm/damon/stat.c=200=static int damon_stat_start(void)\n--\nmm/damon/stat.c-221-\tcall_control.data = damon_stat_context;\nmm/damon/stat.c:222:\treturn damon_call(damon_stat_context, \u0026call_control);\nmm/damon/stat.c-223-}\n--\nmm/damon/sysfs.c=2216=static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond *kdamond)\n--\nmm/damon/sysfs.c-2218-\tstruct damon_ctx *ctx;\nmm/damon/sysfs.c:2219:\tstruct damon_call_control *repeat_call_control;\nmm/damon/sysfs.c-2220-\tint err;\n--\nmm/damon/sysfs.c-2255-\trepeat_call_control-\u003edealloc_on_cancel = true;\nmm/damon/sysfs.c:2256:\tif (damon_call(ctx, repeat_call_control))\nmm/damon/sysfs.c-2257-\t\tkfree(repeat_call_control);\n--\nmm/damon/sysfs.c=2261=static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond)\n--\nmm/damon/sysfs.c-2273-\nmm/damon/sysfs.c:2274:static int damon_sysfs_damon_call(int (*fn)(void *data),\nmm/damon/sysfs.c-2275-\t\tstruct damon_sysfs_kdamond *kdamond)\nmm/damon/sysfs.c-2276-{\nmm/damon/sysfs.c:2277:\tstruct damon_call_control call_control = {};\nmm/damon/sysfs.c-2278-\tint err;\n--\nmm/damon/sysfs.c-2283-\tcall_control.data = kdamond;\nmm/damon/sysfs.c:2284:\terr = damon_call(kdamond-\u003edamon_ctx, \u0026call_control);\nmm/damon/sysfs.c-2285-\treturn err ? err : call_control.return_code;\n--\nmm/damon/sysfs.c=2337=static int damon_sysfs_handle_cmd(enum damon_sysfs_cmd cmd,\n--\nmm/damon/sysfs.c-2348-\tcase DAMON_SYSFS_CMD_COMMIT:\nmm/damon/sysfs.c:2349:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2350-\t\t\t\tdamon_sysfs_commit_input, kdamond);\nmm/damon/sysfs.c-2351-\tcase DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS:\nmm/damon/sysfs.c:2352:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2353-\t\t\t\tdamon_sysfs_commit_schemes_quota_goals,\n--\nmm/damon/sysfs.c-2355-\tcase DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS:\nmm/damon/sysfs.c:2356:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2357-\t\t\t\tdamon_sysfs_upd_schemes_stats, kdamond);\n--\nmm/damon/sysfs.c-2365-\tcase DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS:\nmm/damon/sysfs.c:2366:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2367-\t\t\t\tdamon_sysfs_upd_schemes_effective_quotas,\n--\nmm/damon/sysfs.c-2369-\tcase DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS:\nmm/damon/sysfs.c:2370:\t\treturn damon_sysfs_damon_call(\nmm/damon/sysfs.c-2371-\t\t\t\tdamon_sysfs_upd_tuned_intervals, kdamond);\n"
}

gemini-3.1-pro-preview

							input: 9893
							output: 27
							thoughts: 177

**DAMON Kernel Module Update - Initial Assessment**

Okay, so I see we have some updates concentrated within the DAMON subsystem, specifically touching `mm/damon/core.c`, `mm/damon/lru_sort.c`, `mm/damon/reclaim.c`, and `mm/damon/sysfs.c`. Looks like we're refining DAMON's core functionality.

The modifications are spread across the lifecycle management, with changes to `damon_start`, `__damon_stop`, `damon_stop`, and `damon_call`. We've also got some tuning in the operational loop with `damon_lru_sort_turn`, `damon_reclaim_turn`, and a sysfs update, `damon_sysfs_turn_damon_off`. Interesting. Looks like we're getting more control and potentially more efficient memory monitoring and management.

Now, let's see which features we're bringing online. The config changes include enabling `DAMON`, `DAMON_VADDR`, `DAMON_PADDR`, `DAMON_SYSFS`, `DAMON_RECLAIM`, and `DAMON_LRU_SORT`. This confirms we're aiming for a comprehensive DAMON implementation, handling both virtual and physical addresses, integrated with the sysfs interface, and employing reclaim and LRU-based sorting strategies.

Before diving into the code itself, let me quickly glance at the `samples/damon/` directory. That should give me a good handle on how these new configurations are intended to be used and any example workflows.

{
  "Expression": "config SAMPLE_DAMON",
  "PathPrefix": "samples/"
}

{
  "Output": "samples/damon/Kconfig=3=menu \"DAMON Samples\"\nsamples/damon/Kconfig-4-\nsamples/damon/Kconfig:5:config SAMPLE_DAMON_WSSE\nsamples/damon/Kconfig-6-\tbool \"DAMON sample module for working set size estimation\"\n--\nsamples/damon/Kconfig-16-\nsamples/damon/Kconfig:17:config SAMPLE_DAMON_PRCL\nsamples/damon/Kconfig-18-\tbool \"DAMON sample module for access-aware proactive reclamation\"\n--\nsamples/damon/Kconfig-29-\nsamples/damon/Kconfig:30:config SAMPLE_DAMON_MTIER\nsamples/damon/Kconfig-31-\tbool \"DAMON sample module for memory tiering\"\n"
}

gemini-3.1-pro-preview

							input: 10642
							output: 31
							thoughts: 434

**My DAMON Configuration Check**

Okay, so I need to update the DAMON configs. I'm going to add `SAMPLE_DAMON_WSSE`, `SAMPLE_DAMON_PRCL`, and `SAMPLE_DAMON_MTIER`.

Now, regarding the focus symbols, I'm going to work with `damon_start`, `damon_stop`, `damon_call`, `damon_lru_sort_turn`, `damon_reclaim_turn`, and `damon_sysfs_turn_damon_off`. I'll keep an eye out for other relevant functions, although I know `__damon_stop` is static and isn't something I can directly focus on. `damon_stop` calls that function, so I'm not overlooking it.

I'm also looking at the existing configs. I noticed `DAMON_STAT`, but the patch didn't touch `mm/damon/stat.c` even though `damon_stat_start` calls `damon_call`. The patch changes: `include/linux/damon.h`, `mm/damon/core.c`, `mm/damon/lru_sort.c`, `mm/damon/reclaim.c`, `mm/damon/sysfs.c`, and the samples (`samples/damon/mtier.c`, `samples/damon/prcl.c`, `samples/damon/wsse.c`).

So, I'm dealing with `DAMON`, `DAMON_VADDR`, `DAMON_PADDR`, `DAMON_SYSFS`, `DAMON_RECLAIM`, `DAMON_LRU_SORT`, along with the new samples. I'll need to confirm that `DAMON_VADDR` and `DAMON_PADDR` are still required, since they are essential for virtual and physical address space operations, and are usually needed for DAMON to function. I'll do a final check to make sure I've got everything.

{
  "Expression": "depends on DAMON",
  "PathPrefix": "mm/damon/Kconfig"
}

{
  "Output": "mm/damon/Kconfig=15=config DAMON_DEBUG_SANITY\nmm/damon/Kconfig-16-\tbool \"Check sanity of DAMON code\"\nmm/damon/Kconfig:17:\tdepends on DAMON\nmm/damon/Kconfig-18-\thelp\n--\nmm/damon/Kconfig=26=config DAMON_KUNIT_TEST\nmm/damon/Kconfig-27-\tbool \"Test for damon\" if !KUNIT_ALL_TESTS\nmm/damon/Kconfig:28:\tdepends on DAMON \u0026\u0026 KUNIT=y\nmm/damon/Kconfig-29-\tdefault KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig=38=config DAMON_VADDR\nmm/damon/Kconfig-39-\tbool \"Data access monitoring operations for virtual address spaces\"\nmm/damon/Kconfig:40:\tdepends on DAMON \u0026\u0026 MMU\nmm/damon/Kconfig-41-\tselect PAGE_IDLE_FLAG\n--\nmm/damon/Kconfig=47=config DAMON_PADDR\nmm/damon/Kconfig-48-\tbool \"Data access monitoring operations for the physical address space\"\nmm/damon/Kconfig:49:\tdepends on DAMON \u0026\u0026 MMU\nmm/damon/Kconfig-50-\tselect PAGE_IDLE_FLAG\n--\nmm/damon/Kconfig=56=config DAMON_VADDR_KUNIT_TEST\nmm/damon/Kconfig-57-\tbool \"Test for DAMON operations\" if !KUNIT_ALL_TESTS\nmm/damon/Kconfig:58:\tdepends on DAMON_VADDR \u0026\u0026 KUNIT=y\nmm/damon/Kconfig-59-\tdefault KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig=68=config DAMON_SYSFS\nmm/damon/Kconfig-69-\tbool \"DAMON sysfs interface\"\nmm/damon/Kconfig:70:\tdepends on DAMON \u0026\u0026 SYSFS\nmm/damon/Kconfig-71-\tdefault DAMON\n--\nmm/damon/Kconfig=76=config DAMON_SYSFS_KUNIT_TEST\nmm/damon/Kconfig-77-\tbool \"Test for damon sysfs interface\" if !KUNIT_ALL_TESTS\nmm/damon/Kconfig:78:\tdepends on DAMON_SYSFS \u0026\u0026 KUNIT=y\nmm/damon/Kconfig-79-\tdefault KUNIT_ALL_TESTS\n--\nmm/damon/Kconfig=88=config DAMON_RECLAIM\nmm/damon/Kconfig-89-\tbool \"Build DAMON-based reclaim (DAMON_RECLAIM)\"\nmm/damon/Kconfig:90:\tdepends on DAMON_PADDR\nmm/damon/Kconfig-91-\thelp\n--\nmm/damon/Kconfig=100=config DAMON_LRU_SORT\nmm/damon/Kconfig-101-\tbool \"Build DAMON-based LRU-lists sorting (DAMON_LRU_SORT)\"\nmm/damon/Kconfig:102:\tdepends on DAMON_PADDR\nmm/damon/Kconfig-103-\thelp\n--\nmm/damon/Kconfig=108=config DAMON_STAT\nmm/damon/Kconfig-109-\tbool \"Build data access monitoring stat (DAMON_STAT)\"\nmm/damon/Kconfig:110:\tdepends on DAMON_PADDR\nmm/damon/Kconfig-111-\thelp\n--\nmm/damon/Kconfig=116=config DAMON_STAT_ENABLED_DEFAULT\nmm/damon/Kconfig-117-\tbool \"Enable DAMON_STAT by default\"\nmm/damon/Kconfig:118:\tdepends on DAMON_STAT\nmm/damon/Kconfig-119-\tdefault DAMON_STAT\n"
}

gemini-3.1-pro-preview

							input: 12525
							output: 29
							thoughts: 87

Here's my thought process, as an expert in this area:

**Analyzing DAMON Kconfig Dependencies**

Alright, let's break down these DAMON Kconfig dependencies. It's clear that both `DAMON_RECLAIM` and `DAMON_LRU_SORT` are built upon the foundation of `DAMON_PADDR`. This makes sense – reclaiming and sorting based on LRU typically require physical address considerations. Moving on, the presence of `DAMON_SYSFS` is contingent on the availability of both `DAMON` itself and the `SYSFS` infrastructure. That's standard practice for exposing control interfaces. Now, `DAMON_VADDR` and `DAMON_PADDR` both seem to depend on `DAMON` and the `MMU`. This suggests that virtual and physical address manipulation within DAMON requires the MMU's functionality, which is no surprise really. To gain further insight, let's take a closer look at `samples/damon/Kconfig` to see the complete picture of how everything fits together in the actual kernel configuration files.

{
  "Expression": "depends on",
  "PathPrefix": "samples/damon/Kconfig"
}

{
  "Output": "samples/damon/Kconfig=5=config SAMPLE_DAMON_WSSE\nsamples/damon/Kconfig-6-\tbool \"DAMON sample module for working set size estimation\"\nsamples/damon/Kconfig:7:\tdepends on DAMON \u0026\u0026 DAMON_VADDR\nsamples/damon/Kconfig-8-\thelp\n--\nsamples/damon/Kconfig=17=config SAMPLE_DAMON_PRCL\nsamples/damon/Kconfig-18-\tbool \"DAMON sample module for access-aware proactive reclamation\"\nsamples/damon/Kconfig:19:\tdepends on DAMON \u0026\u0026 DAMON_VADDR\nsamples/damon/Kconfig-20-\thelp\n--\nsamples/damon/Kconfig=30=config SAMPLE_DAMON_MTIER\nsamples/damon/Kconfig-31-\tbool \"DAMON sample module for memory tiering\"\nsamples/damon/Kconfig:32:\tdepends on DAMON \u0026\u0026 DAMON_PADDR\nsamples/damon/Kconfig-33-\thelp\n"
}

gemini-3.1-pro-preview

							input: 13130
							output: 237
							thoughts: 215

**Analyzing the DAMON Configuration and Patch**

Okay, let's break this down. First, I'm seeing a list of DAMON configuration symbols: `DAMON`, `DAMON_VADDR`, `DAMON_PADDR`, `DAMON_SYSFS`, `DAMON_RECLAIM`, `DAMON_LRU_SORT`, and then a few sample symbols: `SAMPLE_DAMON_WSSE`, `SAMPLE_DAMON_PRCL`, and `SAMPLE_DAMON_MTIER`. Nothing unexpected there – these are the knobs we'd expect to see to control DAMON's behavior and features.

Now, focusing on the core symbols: `damon_start`, `damon_stop`, `damon_call`, `damon_lru_sort_turn`, `damon_reclaim_turn`, and `damon_sysfs_turn_damon_off`. These are the entry points and control points. I need to understand how the patch is impacting these specific functions.

Aha! The patch modifies `damon_stop`. It changes the return type to `void`, meaning no error code is being returned anymore. Furthermore, the behavior has been altered in such a way that it no longer returns an error code, which implies a change in how errors are handled, or perhaps a simplification of the error handling strategy. It also states that `damon_call` now waits for the context to stop if the call is cancelled.

Yes, this represents a significant, functional change to the very core of DAMON's logic. It could affect how we manage error states and how we handle asynchronous operations. I'm going to want to deeply analyze the impact of this change on the overall system behavior, error propagation, and any potential race conditions introduced by the changes. Now that I understand the core of the change, I'm going to proceed to call `set-results`.

{
  "EnableConfigs": [
    "DAMON",
    "DAMON_VADDR",
    "DAMON_PADDR",
    "DAMON_SYSFS",
    "DAMON_RECLAIM",
    "DAMON_LRU_SORT",
    "SAMPLE_DAMON_WSSE",
    "SAMPLE_DAMON_PRCL",
    "SAMPLE_DAMON_MTIER"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_stop",
    "damon_call",
    "damon_lru_sort_turn",
    "damon_reclaim_turn",
    "damon_sysfs_turn_damon_off"
  ],
  "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "DAMON",
    "DAMON_VADDR",
    "DAMON_PADDR",
    "DAMON_SYSFS",
    "DAMON_RECLAIM",
    "DAMON_LRU_SORT",
    "SAMPLE_DAMON_WSSE",
    "SAMPLE_DAMON_PRCL",
    "SAMPLE_DAMON_MTIER"
  ],
  "FocusSymbols": [
    "damon_start",
    "damon_stop",
    "damon_call",
    "damon_lru_sort_turn",
    "damon_reclaim_turn",
    "damon_sysfs_turn_damon_off"
  ],
  "Reasoning": "The patch modifies the core DAMON (Data Access MONitor) logic, changing the return type of `damon_stop` to `void` and updating its callers. It also modifies `damon_call` to wait for the context to stop if the call is canceled. These are functional changes to reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

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)