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authorLi Zefan <lizf@cn.fujitsu.com>2009-01-16 00:51:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-16 03:39:41 +0300
commit068b38c1fa7a9210608f27ac521897ccc5f9b726 (patch)
tree6ae0ca440bab074c03a4cd4528e8c1467458753f /include/linux/phantom.h
parent0eb253e223c88b982461e59154fcad1b82597592 (diff)
downloadlinux-068b38c1fa7a9210608f27ac521897ccc5f9b726.tar.xz
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/linux/phantom.h')
0 files changed, 0 insertions, 0 deletions