The patch titled
Subject: mm/damon/core: remove unnecessary si_meminfo invoke.
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-core-remove-unnecessary-si_meminfo-invoke.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-remove-unnecessary-si_meminfo-invoke.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: Huan Yang <link@xxxxxxxx>
Subject: mm/damon/core: remove unnecessary si_meminfo invoke.
Date: Wed, 20 Sep 2023 09:57:27 +0800
si_meminfo() will read and assign more info not just free/ram pages. For
just DAMOS_WMARK_FREE_MEM_RATE use, only get free and ram pages is ok to
save cpu.
Link: https://lkml.kernel.org/r/20230920015727.4482-1-link@xxxxxxxx
Signed-off-by: Huan Yang <link@xxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/core.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/mm/damon/core.c~mm-damon-core-remove-unnecessary-si_meminfo-invoke
+++ a/mm/damon/core.c
@@ -1326,12 +1326,10 @@ static bool kdamond_need_stop(struct dam
static unsigned long damos_wmark_metric_value(enum damos_wmark_metric metric)
{
- struct sysinfo i;
-
switch (metric) {
case DAMOS_WMARK_FREE_MEM_RATE:
- si_meminfo(&i);
- return i.freeram * 1000 / i.totalram;
+ return global_zone_page_state(NR_FREE_PAGES) * 1000 /
+ totalram_pages();
default:
break;
}
_
Patches currently in -mm which might be from link@xxxxxxxx are
mm-damon-core-remove-unnecessary-si_meminfo-invoke.patch
