linux-kernel - Re: [PATCH] sched: fix another race when reading /proc/sched

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Message-ID: <6599ad830812190606n6c6cc70ew320b7722785d9345@mail.gmail.com>
Date:	Fri, 19 Dec 2008 06:06:46 -0800
From:	Paul Menage <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Li Zefan <lizf@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: fix another race when reading /proc/sched_debug

On Thu, Dec 18, 2008 at 8:37 PM, Balbir Singh <balbir@...ux.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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