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References: <494234B0.5@cn.fujitsu.com> <20081212100044.GB18152@elte.hu>
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Date: Fri, 19 Dec 2008 06:06:46 -0800
Message-ID: <6599ad830812190606n6c6cc70ew320b7722785d9345@mail.gmail.com>
Subject: Re: [PATCH] sched: fix another race when reading /proc/sched_debug
From: Paul Menage <menage@google.com>
To: balbir@linux.vnet.ibm.com, Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Li Zefan <lizf@cn.fujitsu.com>, Ingo Molnar <mingo@elte.hu>,
       Paul Menage <menage@google.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>
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On Thu, Dec 18, 2008 at 8:37 PM, Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
>>
>> Can't we detect a dead task-group and skip those instead of adding this
>> global lock?
>>
>
> Now we can, there is a css_is_removed() function.
>

With the patch that makes cgroup_path() RCU-safe, you shouldn't need
to do any additional skipping or locking.

Paul
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