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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-01-15 22:51:26 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-16 01:39:41 +0100 |
| commit | 068b38c1fa7a9210608f27ac521897ccc5f9b726 (patch) | |
| tree | 6ae0ca440bab074c03a4cd4528e8c1467458753f /include | |
| parent | memcg: fix section mismatch (diff) | |
| download | linux-068b38c1fa7a9210608f27ac521897ccc5f9b726.tar.xz linux-068b38c1fa7a9210608f27ac521897ccc5f9b726.zip | |
memcg: fix a race when setting memory.swappiness
(suppose: memcg->use_hierarchy == 0 and memcg->swappiness == 60)
echo 10 > /memcg/0/swappiness |
mem_cgroup_swappiness_write() |
... | echo 1 > /memcg/0/use_hierarchy
| mkdir /mnt/0/1
| sub_memcg->swappiness = 60;
memcg->swappiness = 10; |
In the above scenario, we end up having 2 different swappiness
values in a single hierarchy.
We should hold cgroup_lock() when cheking cgrp->children list.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions