linux-kernel - Re: current linux-2.6.git: cpusets completely broken

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Message-ID: <alpine.LFD.1.10.0807121603150.2959@woody.linux-foundation.org>
Date:	Sat, 12 Jul 2008 16:04:38 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
cc:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Paul Menage <menage@...gle.com>,
	Max Krasnyansky <maxk@...lcomm.com>, Paul Jackson <pj@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, miaox@...fujitsu.com,
	rostedt@...dmis.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: current linux-2.6.git: cpusets completely broken



On Sun, 13 Jul 2008, Vegard Nossum wrote:
> 
> (A little pet horse for the occasion: Testing can show the presence of
> errors, but not their absence. But that's a different story.)

Absolutely. Which is actually why I prefer my patch. I think it fixes - in 
general - the issue of CPU migration migrating tasks back to the CPU that 
we're taking down.

The other patches seem to work around just the problem that _triggers_ the 
bug. They don't actually make it impossible to migrate to a CPU that is 
getting shut down - they just try to avoid the particular sequence that 
made it happen for you.

			Linus
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