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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Paul Jackson <pj@sgi.com>
Subject: Re: [DEBUG PATCH] demonstration of hang in sched domain partitioning code
Date: Sun, 7 Oct 2007 17:40:46 +1000
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Cc: Andrew Morton <akpm@osdl.org>, Cliff Wickman <cpw@sgi.com>,
       Paul Menage <menage@google.com>, linux-kernel@vger.kernel.org,
       Randy Dunlap <randy.dunlap@oracle.com>,
       Dinakar Guniguntala <dino@in.ibm.com>, Ingo Molnar <mingo@elte.hu>
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On Friday 05 October 2007 19:24, Paul Jackson wrote:
> Nick,
>
> I'm running into a problem trying to use your suggested
> partition_sched_domains(cpumask_t *partition) routine the way
> I thought I was supposed to be able to use it.
>
> If I ask to set up the same partition twice in a row having
> just one CPU in it (a singleton) the kernel hangs.
>
> I don't know enough about kernel/sched.c to be able to debug
> this very efficiently.  Any chance you could take a look?

Hi Paul,

Yeah I'll take a look. Meanwhile, as Ingo said, the recent patch you
sent is reasonable enough because the most critical thing to do is
to allow users to move away from the old interface.