Commit 1c4448ed authored Jun 01, 2020 by Kaixu Xia Committed by Linus Torvalds Jun 02, 2020

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.

Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Link: http://lkml.kernel.org/r/1587479661-27237-1-git-send-email-kaixuxia@tencent.com


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent a6f5576b

mm/memcontrol.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1314,7 +1314,7 @@ static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg)
		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;

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