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memcg: correct comments for __mem_cgroup_begin_update_page_stat

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Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Qiang Huang 2014-06-04 16:08:22 -07:00 committed by Linus Torvalds
parent bdcbb659fe
commit b5ffc8560c
1 changed files with 4 additions and 5 deletions
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9
mm/memcontrol.c
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@ -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,