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From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Brown, Len" <len.brown@intel.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>,
	Adam Belay <abelay@novell.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>, Andi Kleen <ak@suse.de>
Subject: Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait
Date: Thu, 10 Jan 2008 14:45:43 +0100	[thread overview]
Message-ID: <20080110134539.GD5886@elte.hu> (raw)
In-Reply-To: <1199916725.975.6.camel@localhost.localdomain>


* Steven Rostedt <rostedt@goodmis.org> wrote:

> On Wed, 2008-01-09 at 15:42 -0500, Steven Rostedt wrote:
> > This patch is different than the first patch I sent out.
> > This one just sends an IPI to all CPUS that don't check in after 1 sec.
> > 
> > 
> > Sometimes cpu_idle_wait gets stuck because it might miss CPUS that are
> > already in idle, have no tasks waiting to run and have no interrupts
> > going to them.  This is common on bootup when switching cpu idle
> > governors.
> > 
> > This patch gives those CPUS that don't check in an IPI kick.
> 
> FYI, I just hit this hang on 2.6.24-rc6 without any extra patches. So, 
> unless 2.6.24-rc7 did anything to fix this issue, this is a high 
> priority bug (IMHO).

i'm wondering why this only triggered now. Is this something new in 
2.6.24?

	Ingo

  reply	other threads:[~2008-01-10 13:46 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-08  2:27 [RFC PATCH] kick sleeping idle CPUS on cpu_idle_wait Steven Rostedt
2008-01-08  3:33 ` Andi Kleen
2008-01-09 20:42   ` [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait Steven Rostedt
2008-01-09 22:12     ` Steven Rostedt
2008-01-10 13:45       ` Ingo Molnar [this message]
2008-01-10 14:43         ` Steven Rostedt
2008-01-10 17:31           ` Pallipadi, Venkatesh
2008-01-10 18:03             ` Steven Rostedt
2008-01-09 23:42     ` Andrew Morton
2008-01-10  0:05       ` Steven Rostedt
2008-01-10  0:12     ` Pallipadi, Venkatesh
     [not found]     ` <B5B0CFF685D7DF46A05CF1678CFB42ED20E00653@orsmsx423.amr.corp.intel.com>
2008-02-08  1:05       ` [PATCH] x86: Simplify cpu_idle_wait Venki Pallipadi
2008-02-08 10:28         ` Andi Kleen
2008-02-08 17:24           ` Venki Pallipadi
2008-02-08 18:45             ` Andi Kleen
2008-02-09  9:33             ` Thomas Gleixner
2008-04-10 16:49               ` Venki Pallipadi

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