From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: rusty@rustcorp.com.au, linux-kernel@vger.kernel.org,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH] cpu_hotplug: don't affect current task's affinity
Date: Thu, 23 Jul 2009 10:06:51 +0800 [thread overview]
Message-ID: <4A67C5BB.3070302@cn.fujitsu.com> (raw)
In-Reply-To: <20090722150246.6d28003a.akpm@linux-foundation.org>
Andrew Morton wrote:
>
> Or are you saying that the mask _should_ have been 0-1,3 but the kernel
> incorrectly set it to "0"?
>
Yes, the mask should become 0-1,3. when original is 2 after cpu2 is offlined.
When cpu2 is offined
original mask after cpu2 is offined
1 1
1-2 1
0-3 0-1,3
2 0-1,3
2(the task who do the offline) 0
I think the last line is incorrect. This patch fix it.
>
> Also, it says "The recovery of the current tasks's cpus_allowed will
> fail under some conditions". What are those conditions?
>
A condition is described in changelog(the same as above).
An example of other condition: the CPUSET of the task is changed
when this task do the offline... the last recovery may fails.
prev parent reply other threads:[~2009-07-23 2:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-14 8:47 [PATCH] cpu_hotplug: don't affect current task's affinity Lai Jiangshan
2009-07-22 22:02 ` Andrew Morton
2009-07-23 2:06 ` Lai Jiangshan [this message]
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