linux-kernel - [PATCH 07/16] mm/damon/core: implement per-scheme ops-handled filter-passed bytes stat

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Message-Id: <20250106193401.109161-8-sj@kernel.org>
Date: Mon,  6 Jan 2025 11:33:52 -0800
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 07/16] mm/damon/core: implement per-scheme ops-handled filter-passed bytes stat

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().

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/damon.h | 3 +++
 mm/damon/core.c       | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index da003173210f..2a93dbe06ecc 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -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;
 };
 
diff --git a/mm/damon/core.c b/mm/damon/core.c
index c6ccb4825c57..c4ce72a86d81 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -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,
-- 
2.39.5