linux-kernel - [PATCH] mm/damon/core: check apply interval in

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Date: Sun,  4 Feb 2024 12:49:46 -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-mm@...ck.org,
	stable@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mm/damon/core: check apply interval in

kdamond_apply_schemes() checks apply intervals of schemes and avoid
further applying any schemes if no scheme passed its apply interval.
However, the following schemes applying function,
damon_do_apply_schemes() iterates all schemes without the apply interval
check.  As a result, the shortest apply interval is applied to all
schemes.  Fix the problem by checking the apply interval in
damon_do_apply_schemes().

Fixes: 42f994b71404 ("mm/damon/core: implement scheme-specific apply interval")
Cc: <stable@...r.kernel.org> # 6.7.x
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/core.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 0c144fb466b8..f444734cc613 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1064,6 +1064,9 @@ static void damon_do_apply_schemes(struct damon_ctx *c,
 	damon_for_each_scheme(s, c) {
 		struct damos_quota *quota = &s->quota;
 
+		if (c->passed_sample_intervals != s->next_apply_sis)
+			continue;
+
 		if (!s->wmarks.activated)
 			continue;
 
@@ -1216,10 +1219,6 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
 		if (c->passed_sample_intervals != s->next_apply_sis)
 			continue;
 
-		s->next_apply_sis +=
-			(s->apply_interval_us ? s->apply_interval_us :
-			 c->attrs.aggr_interval) / sample_interval;
-
 		if (!s->wmarks.activated)
 			continue;
 
@@ -1235,6 +1234,14 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
 		damon_for_each_region_safe(r, next_r, t)
 			damon_do_apply_schemes(c, t, r);
 	}
+
+	damon_for_each_scheme(s, c) {
+		if (c->passed_sample_intervals != s->next_apply_sis)
+			continue;
+		s->next_apply_sis +=
+			(s->apply_interval_us ? s->apply_interval_us :
+			 c->attrs.aggr_interval) / sample_interval;
+	}
 }
 
 /*
-- 
2.39.2