Commit b5ffc856 authored by Qiang Huang's avatar Qiang Huang Committed by Linus Torvalds
Browse files

memcg: correct comments for __mem_cgroup_begin_update_page_stat


Signed-off-by: default avatarQiang Huang <h.huangqiang@huawei.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bdcbb659
......@@ -2276,12 +2276,11 @@ cleanup:
}
/*
* Currently used to update mapped file statistics, but the routine can be
* generalized to update other statistics as well.
* Used to update mapped file or writeback or other statistics.
*
* Notes: Race condition
*
* We usually use page_cgroup_lock() for accessing page_cgroup member but
* We usually use lock_page_cgroup() for accessing page_cgroup member but
* it tends to be costly. But considering some conditions, we doesn't need
* to do so _always_.
*
......@@ -2295,8 +2294,8 @@ cleanup:
* by flags.
*
* Considering "move", this is an only case we see a race. To make the race
* small, we check mm->moving_account and detect there are possibility of race
* If there is, we take a lock.
* small, we check memcg->moving_account and detect there are possibility
* of race or not. If there is, we take a lock.
*/
void __mem_cgroup_begin_update_page_stat(struct page *page,
......
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