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

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Message-ID: <4945B546.5040301@cn.fujitsu.com>
Date:	Mon, 15 Dec 2008 09:39:18 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] sched: fix another race when reading /proc/sched_debug

Paul Menage wrote:
> I sent out some patches last week (search for hierarchy_mutex) that would
> mean that you'd only need to take a subsystem-local lock to keep a cgroup
> alive. People seemed to like them so I'll tweak them based on feedback and
> send them on to Andrew.
> 

Unfortunately, AFAICS the proposed hierarchy_mutex can't solve this bug. :(

> Paul
> 
> On Dec 14, 2008 4:48 AM, "Peter Zijlstra" <a.p.zijlstra@...llo.nl> wrote:
> 
> On Sun, 2008-12-14 at 10:54 +0800, Li Zefan wrote: > > i merged it up in
> tip/master, could you pleas...
> Can't we detect a dead task-group and skip those instead of adding this
> global lock?
> 
>> Signed-off-by: Li Zefan <lizf@...fujitsu.com> > --- > kernel/sched_fair.c
> | 6 ++++++ > kerne...
> 

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