linux-kernel - Re: [PATCH] cpuset: fix regression when failed to generate sched domains

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Date:	Tue, 18 Nov 2008 08:45:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpuset: fix regression when failed to generate sched
	domains


* Li Zefan <lizf@...fujitsu.com> wrote:

> When cpuset failed to generate sched domains due to kmalloc()
> failure, the scheduler should fallback to the single partition
> 'fallback_doms' and rebuild sched domains, but now it only
> destroys but not rebuilds sched domains.
> 
> The regression is introduced by:
> 
> commit dfb512ec4834116124da61d6c1ee10fd0aa32bd6
> Author: Max Krasnyansky <maxk@...lcomm.com>
> Date:   Fri Aug 29 13:11:41 2008 -0700
> 
>     sched: arch_reinit_sched_domains() must destroy domains to force rebuild
> 
> After the above commit, partition_sched_domains(0, NULL, NULL) will
> only destroy sched domains and partition_sched_domains(1, NULL, NULL)
> will create the default sched domain.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>

applied to tip/sched/urgent, thanks!

> Should I also CC stable for 2.6.27.xx ?

i've added a Cc: stable to the commit - that will trigger a -stable 
backport.

	Ingo
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