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| author | Muchun Song <songmuchun@bytedance.com> | 2021-04-29 22:56:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-30 11:20:38 -0700 |
| commit | 7ab345a8973017c89a1be87b6c8722d1fee1fd95 (patch) | |
| tree | 84f5bb5a3c4f4884b768227c0d7197a5f70b8b28 /mm/memcontrol.c | |
| parent | 48060834f2277374bb68c04c62de8b57e769f701 (diff) | |
| download | linux-stable-7ab345a8973017c89a1be87b6c8722d1fee1fd95.tar.gz linux-stable-7ab345a8973017c89a1be87b6c8722d1fee1fd95.tar.bz2 linux-stable-7ab345a8973017c89a1be87b6c8722d1fee1fd95.zip | |
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>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 0f77608e89ca..85fd2d86d23f 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -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); } |