linux-kernel - [RFC PATCH 02/13] mm/damon/core: invoke kdamond

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Message-Id: <20250226063651.513178-3-sj@kernel.org>
Date: Tue, 25 Feb 2025 22:36:40 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 02/13] mm/damon/core: invoke kdamond_call() after merging is done if possible

kdamond_call() callers may iterate the regions, so better to call it
when the number of regions is as small as possible.  It is when
kdamond_merge_regions() is finished.  Invoke it on the point.

This change is also for making future change for carrying online
parameters commit with damon_call() easier.  The commit work should be
able to make sequence between other aggregation interval based
operations including regioins merging and aggregation reset.  Placing
damon_call() invocation after the regions merging makes the sequence
handling simpler.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 310cdc87d5f4..0578e89dff13 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2412,7 +2412,6 @@ static int kdamond_fn(void *data)
 		if (ctx->callback.after_sampling &&
 				ctx->callback.after_sampling(ctx))
 			break;
-		kdamond_call(ctx, false);
 
 		kdamond_usleep(sample_interval);
 		ctx->passed_sample_intervals++;
@@ -2430,9 +2429,10 @@ static int kdamond_fn(void *data)
 		}
 
 		/*
-		 * do kdamond_apply_schemes() after kdamond_merge_regions() if
-		 * possible, to reduce overhead
+		 * do kdamond_call() and kdamond_apply_schemes() after
+		 * kdamond_merge_regions() if possible, to reduce overhead
 		 */
+		kdamond_call(ctx, false);
 		if (!list_empty(&ctx->schemes))
 			kdamond_apply_schemes(ctx);
 		else
-- 
2.39.5