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From: Andi Kleen <ak@suse.de>
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>,
	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	Andi Kleen <ak@suse.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>
Subject: Re: [RFC PATCH] kick sleeping idle CPUS on cpu_idle_wait
Date: Tue, 8 Jan 2008 04:33:30 +0100	[thread overview]
Message-ID: <20080108033329.GI2998@bingen.suse.de> (raw)
In-Reply-To: <1199759244.26343.35.camel@localhost.localdomain>

On Mon, Jan 07, 2008 at 09:27:24PM -0500, Steven Rostedt wrote:
> 
> 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.

I must admit I never liked that cpu idle wait code anyways. Why again
can't normal RCU be used for this? Waiting for two RCU quiescent cycles should
be enough, shouldn't it?

-Andi

  reply	other threads:[~2008-01-08  3:33 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-08  2:27 Steven Rostedt
2008-01-08  3:33 ` Andi Kleen [this message]
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
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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