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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2009-01-08 05:08:23 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 19:31:08 +0300
commit2733c06ac864ed40b9dfbbd5270f3f16949bd4a1 (patch)
tree4847ad04739d6a25dede0e0329295c15cbb79dda /mm/vmscan.c
parente72e2bd6747c7a5c432197b6614cf3a387e61a0e (diff)
downloadlinux-2733c06ac864ed40b9dfbbd5270f3f16949bd4a1.tar.xz
memcg: protect prev_priority
Currently, mem_cgroup doesn't have own lock and almost its member doesn't need. (e.g. mem_cgroup->info is protected by zone lock, mem_cgroup->stat is per cpu variable) However, there is one explict exception. mem_cgroup->prev_priorit need lock, but doesn't protect. Luckly, this is NOT bug because prev_priority isn't used for current reclaim code. However, we plan to use prev_priority future again. Therefore, fixing is better. In addition, we plan to reuse this lock for another member. Then "reclaim_param_lock" name is better than "prev_priority_lock". Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Hugh Dickins <hugh@veritas.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
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