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

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Message-ID: <alpine.LFD.1.10.0807121607160.2959@woody.linux-foundation.org>
Date:	Sat, 12 Jul 2008 16:17:38 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
cc:	Vegard Nossum <vegard.nossum@...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, Dmitry Adamushko wrote:
>
> try_to_wake_up() -> ... -> wake_idle() does not see "cpu_active_map".

You're right. I missed a couple places, because that migrate code not only 
ends up using "cpu_is_offline()" instead of "!cpu_online()" (so my greps 
all failed), and because it has those online checks in multiple places. 
Grr.

So it would need to change a few other "cpu_is_offline()" calls to 
"!cpu_active()" instead (in __migrate_task at a minimum).

		Linus
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