Add sysfs support for the new NODE_TARGET_MEM_BP quota goal metric. This exposes the metric as 'node_target_mem_bp' under the quota goal's target_metric attribute. The metric measures the ratio of scheme-eligible memory (regions matching the scheme's access pattern) on a specified NUMA node to the node's total capacity, expressed in basis points (bp, 1/10000). Users can configure this metric by: 1. Setting target_metric to 'node_target_mem_bp' 2. Setting nid to the target NUMA node 3. Setting target_value to the desired ratio in basis points The current_value attribute shows the measured ratio, which can be used by userspace to compute the actual bytes of scheme-eligible memory on the node: bytes = current_value * node_capacity / 10000. This is particularly useful for tiered memory systems to monitor and control the distribution of hot pages across NUMA nodes. Suggested-by: SeongJae Park Signed-off-by: Ravi Jonnalagadda --- mm/damon/sysfs-schemes.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 3a699dcd5a7f..50133263c592 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1038,6 +1038,10 @@ struct damos_sysfs_qgoal_metric_name damos_sysfs_qgoal_metric_names[] = { .metric = DAMOS_QUOTA_NODE_MEMCG_FREE_BP, .name = "node_memcg_free_bp", }, + { + .metric = DAMOS_QUOTA_NODE_TARGET_MEM_BP, + .name = "node_target_mem_bp", + }, }; static ssize_t target_metric_show(struct kobject *kobj, @@ -2554,6 +2558,7 @@ static int damos_sysfs_add_quota_score( break; case DAMOS_QUOTA_NODE_MEM_USED_BP: case DAMOS_QUOTA_NODE_MEM_FREE_BP: + case DAMOS_QUOTA_NODE_TARGET_MEM_BP: goal->nid = sysfs_goal->nid; break; case DAMOS_QUOTA_NODE_MEMCG_USED_BP: -- 2.43.0