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mm/damon/core: implement per-scheme ops-handled filter-passed bytes stat

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Implement a new per-DAMOS scheme statistic field, namely
sz_ops_filter_passed, using the changed damon_operations->apply_scheme()
interface.  It counts total bytes of memory that given DAMOS action tried
to be applied, and passed the operations layer handled region-internal
filters of the scheme.  DAMON API users can access it using DAMON-internal
safe access features such as damon_call() and/or damos_walk().

Link: https://lkml.kernel.org/r/20250106193401.109161-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2025-01-06 11:33:52 -08:00
committed by Andrew Morton
parent c0cb9d91bf
commit 60fa9355a6
2 changed files with 7 additions and 2 deletions
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3
include/linux/damon.h
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@@ -286,6 +286,8 @@ struct damos_watermarks {
* @sz_tried: Total size of regions that the scheme is tried to be applied.
* @nr_applied: Total number of regions that the scheme is applied.
* @sz_applied: Total size of regions that the scheme is applied.
* @sz_ops_filter_passed:
* Total bytes that passed ops layer-handled DAMOS filters.
* @qt_exceeds: Total number of times the quota of the scheme has exceeded.
*
* "Tried an action to a region" in this context means the DAMOS core logic
@@ -310,6 +312,7 @@ struct damos_stat {
unsigned long sz_tried;
unsigned long nr_applied;
unsigned long sz_applied;
unsigned long sz_ops_filter_passed;
unsigned long qt_exceeds;
};

6
mm/damon/core.c
View File

@@ -1362,13 +1362,15 @@ static bool damos_skip_charged_region(struct damon_target *t,
}
static void damos_update_stat(struct damos *s,
unsigned long sz_tried, unsigned long sz_applied)
unsigned long sz_tried, unsigned long sz_applied,
unsigned long sz_ops_filter_passed)
{
s->stat.nr_tried++;
s->stat.sz_tried += sz_tried;
if (sz_applied)
s->stat.nr_applied++;
s->stat.sz_applied += sz_applied;
s->stat.sz_ops_filter_passed += sz_ops_filter_passed;
}
static bool __damos_filter_out(struct damon_ctx *ctx, struct damon_target *t,
@@ -1586,7 +1588,7 @@ static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t,
r->age = 0;
update_stat:
damos_update_stat(s, sz, sz_applied);
damos_update_stat(s, sz, sz_applied, sz_ops_filter_passed);
}
static void damon_do_apply_schemes(struct damon_ctx *c,