From: Li Zefan <lizf@cn.fujitsu.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Michal Hocko <mhocko@suse.cz>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [patch 1/2] kernel: cgroup: push rcu read locking from css_is_ancestor() to callsite
Date: Thu, 01 Mar 2012 09:38:31 +0800 [thread overview]
Message-ID: <4F4ED317.2090404@cn.fujitsu.com> (raw)
In-Reply-To: <1330438489-21909-1-git-send-email-hannes@cmpxchg.org>
Johannes Weiner 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@cmpxchg.org>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
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next prev parent reply other threads:[~2012-03-01 1:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-28 14:14 Johannes Weiner
2012-02-28 14:14 ` [patch 2/2] mm: memcg: count pte references from every member of the reclaimed hierarchy Johannes Weiner
2012-02-28 15:46 ` Konstantin Khlebnikov
2012-02-29 0:39 ` KAMEZAWA Hiroyuki
2012-02-29 2:02 ` Johannes Weiner
2012-02-29 3:08 ` KAMEZAWA Hiroyuki
2012-03-14 14:25 ` Michal Hocko
2012-03-14 16:21 ` Johannes Weiner
2012-03-14 17:53 ` Michal Hocko
2012-03-14 17:54 ` Michal Hocko
2012-02-29 0:00 ` [patch 1/2] kernel: cgroup: push rcu read locking from css_is_ancestor() to callsite KAMEZAWA Hiroyuki
2012-03-01 1:38 ` Li Zefan [this message]
2012-03-14 12:41 ` Michal Hocko
2012-04-24 19:35 Johannes Weiner
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