Re: [patch 1/2] kernel: cgroup: push rcu read locking fromcss_is_ancestor() to callsite

[KAMEZAWA Hiroyuki]

On Tue, 28 Feb 2012 15:14:48 +0100
Johannes Weiner <hannes@xxxxxxxxxxx> wrote:

> 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@xxxxxxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>


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