The patch titled
Subject: mm: memcontrol: simplify value comparison between count and limit
has been added to the -mm tree. Its filename is
mm-memcontrol-simplify-value-comparison-between-count-and-limit.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-simplify-value-comparison-between-count-and-limit.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-simplify-value-comparison-between-count-and-limit.patch
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------------------------------------------------------
From: Kaixu Xia <kaixuxia@xxxxxxxxxxx>
Subject: mm: memcontrol: simplify value comparison between count and limit
When the variables count and limit have the same value(count == limit),
the result of min(margin, limit - count) statement should be 0 and the
variable margin is set to 0. So in this case, the min() statement is not
necessary and we can directly set the variable margin to 0.
Link: http://lkml.kernel.org/r/1587479661-27237-1-git-send-email-kaixuxia@xxxxxxxxxxx
Signed-off-by: Kaixu Xia <kaixuxia@xxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memcontrol.c~mm-memcontrol-simplify-value-comparison-between-count-and-limit
+++ a/mm/memcontrol.c
@@ -1314,7 +1314,7 @@ static unsigned long mem_cgroup_margin(s
if (do_memsw_account()) {
count = page_counter_read(&memcg->memsw);
limit = READ_ONCE(memcg->memsw.max);
- if (count <= limit)
+ if (count < limit)
margin = min(margin, limit - count);
else
margin = 0;
_
Patches currently in -mm which might be from kaixuxia@xxxxxxxxxxx are
mm-memcontrol-simplify-value-comparison-between-count-and-limit.patch
