diff options
| author | Yu Zhao <yuzhao@google.com> | 2017-06-16 14:02:31 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-24 07:11:16 +0200 |
| commit | f7ae7d2229d2f7c372a00b80c22b6eb5a9ac1949 (patch) | |
| tree | e96cd51a08f343552875a1be9babbb015156fe39 /mm | |
| parent | 1419b8752153d50f21cb34131cc613ee09662d8a (diff) | |
swap: cond_resched in swap_cgroup_prepare()
commit ef70762948dde012146926720b70e79736336764 upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/swap_cgroup.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c index 310ac0b8f974..454d6d7509ed 100644 --- a/mm/swap_cgroup.c +++ b/mm/swap_cgroup.c @@ -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: |