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mm: memcontrol: change ug->dummy_page only if memcg changed 

Just like assignment to ug->memcg, we only need to update ug->dummy_page
if memcg changed.  So move it to there.  This is a very small
optimization.

Link: https://lkml.kernel.org/r/20210319163821.20704-5-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Muchun Song 2021-04-29 22:56:48 -07:00 committed by Linus Torvalds
parent 48060834f2
commit 7ab345a897
1 changed files with 1 additions and 1 deletions
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2
mm/memcontrol.c
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@ -6843,6 +6843,7 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
uncharge_gather_clear(ug);
}
ug->memcg = page_memcg(page);
ug->dummy_page = page;
/* pairs with css_put in uncharge_batch */
css_get(&ug->memcg->css);
@ -6856,7 +6857,6 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
else
ug->pgpgout++;
ug->dummy_page = page;
page->memcg_data = 0;
css_put(&ug->memcg->css);
}