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
