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swap: cond_resched in swap_cgroup_prepare()

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I saw need_resched() warnings when swapping on large swapfile (TBs)
because continuously allocating many pages in swap_cgroup_prepare() took
too long.

We already cond_resched when freeing page in swap_cgroup_swapoff().  Do
the same for the page allocation.

Link: http://lkml.kernel.org/r/20170604200109.17606-1-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yu Zhao 2017-06-16 14:02:31 -07:00 committed by Linus Torvalds
parent 7258ae5c5a
commit ef70762948
1 changed files with 3 additions and 0 deletions
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3
mm/swap_cgroup.c
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@ -48,6 +48,9 @@ static int swap_cgroup_prepare(int type)
if (!page)
goto not_enough_page;
ctrl->map[idx] = page;
if (!(idx % SWAP_CLUSTER_MAX))
cond_resched();
}
return 0;
not_enough_page: