+ mm-damon-core-skip-apply-schemes-if-empty.patch added to mm-unstable branch

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The patch titled
     Subject: mm/damon/core: skip apply schemes if empty
has been added to the -mm mm-unstable branch.  Its filename is
     mm-damon-core-skip-apply-schemes-if-empty.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-skip-apply-schemes-if-empty.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Huaisheng Ye <huaisheng.ye@xxxxxxxxx>
Subject: mm/damon/core: skip apply schemes if empty
Date: Mon, 16 Jan 2023 14:23:47 +0800

Sometimes there is no scheme in damon's context, for example just use damo
record to monitor workload's data access pattern.

If current damon context doesn't have any scheme in the list, kdamond has
no need to iterate over list of all targets and regions but do nothing.

So, skip apply schemes when ctx->schemes is empty.

Link: https://lkml.kernel.org/r/20230116062347.1148553-1-huaisheng.ye@xxxxxxxxx
Signed-off-by: Huaisheng Ye <huaisheng.ye@xxxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---


--- a/mm/damon/core.c~mm-damon-core-skip-apply-schemes-if-empty
+++ a/mm/damon/core.c
@@ -1269,7 +1269,8 @@ static int kdamond_fn(void *data)
 			if (ctx->callback.after_aggregation &&
 					ctx->callback.after_aggregation(ctx))
 				break;
-			kdamond_apply_schemes(ctx);
+			if (!list_empty(&ctx->schemes))
+				kdamond_apply_schemes(ctx);
 			kdamond_reset_aggregated(ctx);
 			kdamond_split_regions(ctx);
 			if (ctx->ops.reset_aggregated)
_

Patches currently in -mm which might be from huaisheng.ye@xxxxxxxxx are

mm-damon-core-skip-apply-schemes-if-empty.patch




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