diff options
| author | Johannes Weiner | 2012-05-30 00:06:24 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2012-05-30 01:22:20 +0200 |
| commit | 91c63734f6908425903aed69c04035592f18d398 (patch) | |
| tree | 6790827ab915b17c63d5c39d8c72c47f3764f868 /mm/vmscan.c | |
| parent | mm: do_migrate_pages(): rename arguments (diff) | |
| download | kernel-qcow2-linux-91c63734f6908425903aed69c04035592f18d398.tar.gz kernel-qcow2-linux-91c63734f6908425903aed69c04035592f18d398.tar.xz kernel-qcow2-linux-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