Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait

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To: Steven Rostedt <rostedt@...>

Cc: LKML <linux-kernel@...>, Linus Torvalds <torvalds@...>, Andrew Morton <akpm@...>, Thomas Gleixner <tglx@...>, Brown, Len <len.brown@...>, Venkatesh Pallipadi <venkatesh.pallipadi@...>, Adam Belay <abelay@...>, Peter Zijlstra <a.p.zijlstra@...>, Andi Kleen <ak@...>

Subject: Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait

Date: Thursday, January 10, 2008 - 9:45 am

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

quoted text> 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
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Messages in current thread:

[RFC PATCH] kick sleeping idle CPUS on cpu_idle_wait, Steven Rostedt, (Mon Jan 7, 10:27 pm)

Re: [RFC PATCH] kick sleeping idle CPUS on cpu_idle_wait, Andi Kleen, (Mon Jan 7, 11:33 pm)

[PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Steven Rostedt, (Wed Jan 9, 4:42 pm)

RE: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Pallipadi, Venkatesh, (Wed Jan 9, 8:12 pm)

Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Andrew Morton, (Wed Jan 9, 7:42 pm)

Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Steven Rostedt, (Wed Jan 9, 8:05 pm)

Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Steven Rostedt, (Wed Jan 9, 6:12 pm)

Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Ingo Molnar, (Thu Jan 10, 9:45 am)

Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Steven Rostedt, (Thu Jan 10, 10:43 am)

RE: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Pallipadi, Venkatesh, (Thu Jan 10, 1:31 pm)

RE: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait, Steven Rostedt, (Thu Jan 10, 2:03 pm)


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Re: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait

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