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| author | Johannes Weiner <hannes@cmpxchg.org> | 2012-05-29 15:06:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-29 16:22:20 -0700 |
| commit | 91c63734f6908425903aed69c04035592f18d398 (patch) | |
| tree | 6790827ab915b17c63d5c39d8c72c47f3764f868 /mm/vmscan.c | |
| parent | 0ce72d4f7333248efbef1f3309770c7edb1b2625 (diff) | |
| download | lwn-91c63734f6908425903aed69c04035592f18d398.tar.gz lwn-91c63734f6908425903aed69c04035592f18d398.zip | |
kernel: cgroup: push rcu read locking from css_is_ancestor() to callsite
Library functions should not grab locks when the callsites can do it,
even if the lock nests like the rcu read-side lock does.
Push the rcu_read_lock() from css_is_ancestor() to its single user,
mem_cgroup_same_or_subtree() in preparation for another user that may
already hold the rcu read-side lock.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
0 files changed, 0 insertions, 0 deletions