[RFC,02/13] mm/damon/core: invoke kdamond_call() after merging is done if possible

Commit Message

SeongJae Park Feb. 26, 2025, 6:36 a.m. UTC

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 <[e-mail]>
---
 mm/damon/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Patch

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