linux-kernel - RE: [PATCH] Kick CPUS that might be sleeping in cpus_idle

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Date:	Thu, 10 Jan 2008 13:03:53 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Brown, Len" <len.brown@...el.com>, Adam Belay <abelay@...ell.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andi Kleen <ak@...e.de>
Subject: RE: [PATCH] Kick CPUS that might be sleeping in cpus_idle_wait


On Thu, 10 Jan 2008, Pallipadi, Venkatesh wrote:
>
>
> With 2.6.23, you can try compiling acpi processor.ko as a module and
> doing insmod and rmmod in a loop. That should call cpu_idle_wait very
> frequently.

The thing is, after the full boot, there's too many things going on to
keep a system fully idle. Little services can wake a processor up. The
problem I had was that this happens on early bootup where there's not much
around to wake the sleeping processor.

I'm not sure if it is too much of a problem after boot up.

-- Steve

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