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

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From: Steven Rostedt <rostedt@...>
To: Ingo Molnar <mingo@...>
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 - 10:43 am

On Thu, 10 Jan 2008, Ingo Molnar wrote:

It only triggeres with the switching of the idle governors. And not just
one, you need to switch twice. The first loading of a governor does not
call cpu_idle_wait, but the second one does. NO_HZ must also be enabled,
plus this needs to happen when no events or threads are scheduled to run
on a CPU, which limits this to boot up.

Also, this only seems to happen on my 2x2 (4way) and only once in a while.

I'm surprised that I'm the only one so far to report it. I can boot up the
2.6.23 kernel on this box to see if it also hangs sometimes. But, as I
said, it may take several hundreds of tries to see it.

-- Steve

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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)