linux-kernel - Re: [tip:sched/core] sched: Check for an idle shared cache in select_task_rq

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Message-ID: <20091105093016.GA18892@elte.hu>
Date:	Thu, 5 Nov 2009 10:30:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	tip-bot for Mike Galbraith <efault@....de>
Cc:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, mingo@...hat.com, peterz@...radead.org,
	arjan@...radead.org, stable@...nel.org, tglx@...utronix.de
Subject: Re: [tip:sched/core] sched: Check for an idle shared cache in
	select_task_rq_fair()


* tip-bot for Mike Galbraith <efault@....de> wrote:

> Commit-ID:  a1f84a3ab8e002159498814eaa7e48c33752b04b
> Gitweb:     http://git.kernel.org/tip/a1f84a3ab8e002159498814eaa7e48c33752b04b
> Author:     Mike Galbraith <efault@....de>
> AuthorDate: Tue, 27 Oct 2009 15:35:38 +0100
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Wed, 4 Nov 2009 18:46:22 +0100
> 
> sched: Check for an idle shared cache in select_task_rq_fair()

-tip testing found that this causes problems:

[   26.804000] BUG: using smp_processor_id() in preemptible [00000000] code: events/1/10
[   26.808000] caller is vmstat_update+0x26/0x70
[   26.812000] Pid: 10, comm: events/1 Not tainted 2.6.32-rc5 #6887
[   26.816000] Call Trace:
[   26.820000]  [<c1924a24>] ? printk+0x28/0x3c
[   26.824000]  [<c13258a0>] debug_smp_processor_id+0xf0/0x110
[   26.824000] mount used greatest stack depth: 1464 bytes left
[   26.828000]  [<c111d086>] vmstat_update+0x26/0x70
[   26.832000]  [<c1086418>] worker_thread+0x188/0x310
[   26.836000]  [<c10863b7>] ? worker_thread+0x127/0x310
[   26.840000]  [<c108d310>] ? autoremove_wake_function+0x0/0x60
[   26.844000]  [<c1086290>] ? worker_thread+0x0/0x310
[   26.848000]  [<c108cf0c>] kthread+0x7c/0x90
[   26.852000]  [<c108ce90>] ? kthread+0x0/0x90
[   26.856000]  [<c100c0a7>] kernel_thread_helper+0x7/0x10
[   26.860000] BUG: using smp_processor_id() in preemptible [00000000] code: events/1/10
[   26.864000] caller is vmstat_update+0x3c/0x70

oh ... doesnt it break cpus_allowed?

	Ingo
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