linux-kernel - Re: [patch] cpusets: allow PF_THREAD_BOUND kworkers to escape from a cpuset

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Date:	Fri, 23 Sep 2011 09:19:05 +0200
From:	Mike Galbraith <mgalbraith@...e.de>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Paul Menage <paul@...lmenage.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [patch] cpusets: allow PF_THREAD_BOUND kworkers to escape from
 a cpuset

On Fri, 2011-09-23 at 15:00 +0800, Li Zefan wrote:

> To make the code more self-explanatory, I think this is a bit better:
> 
> 	if (... && cont != cont->top_cgroup)
> 

Done, your ACK added as well.

kworkers can be born in a cpuset, leaving them adrift on an unsinkable ship.
Allow them to be moved to the root cpuset so the cpuset can be destroyed.

Signed-off-by: Mike Galbraith <efault@....de>
Acked-by: Li Zefan <lizf@...fujitsu.com>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 10131fd..b26f4c4 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1384,7 +1384,7 @@ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cont,
 	 * set_cpus_allowed_ptr() on all attached tasks before cpus_allowed may
 	 * be changed.
 	 */
-	if (tsk->flags & PF_THREAD_BOUND)
+	if (tsk->flags & PF_THREAD_BOUND && cont != cont->top_cgroup)
 		return -EINVAL;
 
 	return 0;


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