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mm/damon/core: add DAMOS quota gaol metric for per-memcg per-numa free memory

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Add a variant of DAMOS_QUOTA_NODE_MEMCG_USED_BP, for the free memory
portion.  The value of the metric is implemented as the entire memory of
the given NUMA node subtracted by the given cgroup's usage.  So from a
perspective, "unused" could be a better term than "free".  But arguably it
is not very clear what is better, so use the term "free".

Link: https://lkml.kernel.org/r/20251017212706.183502-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2025-10-17 14:26:58 -07:00
committed by Andrew Morton
parent a1d1df78ac
commit 98fdce76fb
2 changed files with 12 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/damon.h
View File

@@ -148,6 +148,7 @@ enum damos_action {
* @DAMOS_QUOTA_NODE_MEM_USED_BP: MemUsed ratio of a node.
* @DAMOS_QUOTA_NODE_MEM_FREE_BP: MemFree ratio of a node.
* @DAMOS_QUOTA_NODE_MEMCG_USED_BP: MemUsed ratio of a node for a cgroup.
* @DAMOS_QUOTA_NODE_MEMCG_FREE_BP: MemFree ratio of a node for a cgroup.
* @NR_DAMOS_QUOTA_GOAL_METRICS: Number of DAMOS quota goal metrics.
*
* Metrics equal to larger than @NR_DAMOS_QUOTA_GOAL_METRICS are unsupported.
@@ -158,6 +159,7 @@ enum damos_quota_goal_metric {
DAMOS_QUOTA_NODE_MEM_USED_BP,
DAMOS_QUOTA_NODE_MEM_FREE_BP,
DAMOS_QUOTA_NODE_MEMCG_USED_BP,
DAMOS_QUOTA_NODE_MEMCG_FREE_BP,
NR_DAMOS_QUOTA_GOAL_METRICS,
};
@@ -183,8 +185,8 @@ enum damos_quota_goal_metric {
* If @metric is DAMOS_QUOTA_NODE_MEM_{USED,FREE}_BP, @nid represents the node
* id of the target node to account the used/free memory.
*
* If @metric is DAMOS_QUOTA_NODE_MEMCG_USED_BP, @nid and @memcg_id represents
* the node id and the cgroup to account the used memory for.
* If @metric is DAMOS_QUOTA_NODE_MEMCG_{USED,FREE}_BP, @nid and @memcg_id
* represents the node id and the cgroup to account the used memory for.
*/
struct damos_quota_goal {
enum damos_quota_goal_metric metric;

10
mm/damon/core.c
View File

@@ -790,6 +790,7 @@ static void damos_commit_quota_goal_union(
dst->nid = src->nid;
break;
case DAMOS_QUOTA_NODE_MEMCG_USED_BP:
case DAMOS_QUOTA_NODE_MEMCG_FREE_BP:
dst->nid = src->nid;
dst->memcg_id = src->memcg_id;
break;
@@ -2046,7 +2047,7 @@ static unsigned long damos_get_node_memcg_used_bp(
{
struct mem_cgroup *memcg;
struct lruvec *lruvec;
unsigned long used_pages;
unsigned long used_pages, numerator;
struct sysinfo i;
rcu_read_lock();
@@ -2066,7 +2067,11 @@ static unsigned long damos_get_node_memcg_used_bp(
used_pages += lruvec_page_state(lruvec, NR_INACTIVE_FILE);
si_meminfo_node(&i, goal->nid);
return used_pages * 10000 / i.totalram;
if (goal->metric == DAMOS_QUOTA_NODE_MEMCG_USED_BP)
numerator = used_pages;
else /* DAMOS_QUOTA_NODE_MEMCG_FREE_BP */
numerator = i.totalram - used_pages;
return numerator * 10000 / i.totalram;
}
#else
static __kernel_ulong_t damos_get_node_mem_bp(
@@ -2101,6 +2106,7 @@ static void damos_set_quota_goal_current_value(struct damos_quota_goal *goal)
goal->current_value = damos_get_node_mem_bp(goal);
break;
case DAMOS_QUOTA_NODE_MEMCG_USED_BP:
case DAMOS_QUOTA_NODE_MEMCG_FREE_BP:
goal->current_value = damos_get_node_memcg_used_bp(goal);
break;
default: