linux-kernel - Re: [patch] sched: prevent bound kthreads from changing cpus

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Message-Id: <1212699129.3319.129.camel@localhost.localdomain>
Date:	Thu, 05 Jun 2008 13:52:09 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Paul Menage <menage@...gle.com>, Paul Jackson <pj@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] sched: prevent bound kthreads from changing
	cpus_allowed


On Thu, 2008-06-05 at 12:57 -0700, David Rientjes wrote:
> Kthreads that have called kthread_bind() are bound to specific cpus, so
> other tasks should not be able to change their cpus_allowed from under
> them.  Otherwise, it is possible to move kthreads, such as the migration
> or software watchdog threads, so they are not allowed access to the cpu
> they work on.

I'm all for it .. I've crashed test systems just by migrating tasks that
are suppose to stay bound while using cpusets ..

Daniel

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