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

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Date:	Sun, 13 Jul 2008 01:25:02 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"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, Jul 13, 2008 at 1:05 AM, Dmitry Adamushko
<dmitry.adamushko@...il.com> wrote:
> Are you sure that you have removed my patch or the one from Miao? I
> would be really surprised if this patch works without them. Linus has
> updated sched_migrate_task() which is used _only_ by sched_exec() ---
> this is not the path that leads to this bug. try_to_wake_up() -> ...
> -> wake_idle() does not see "cpu_active_map".

Absolutely. I could have made an error somewhere along the way, of
course (yes, it does happen), but I am quite sure I did everything
correctly.

If you doubt it, you could try it too. All that is needed to reproduce
the original BUG here is CPUSETS=y and bring cpu1 down.


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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