linux-kernel - Re: [PATCH] Track accurate idle time with tick_sched.idle

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Message-ID: <20070902074622.GA16045@one.firstfloor.org>
Date:	Sun, 2 Sep 2007 09:46:22 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Track accurate idle time with tick_sched.idle_sleeptime

> at least the current out-of-idle code already does what amounts to a 
> PM-timer read when exiting from C2 or C3 mode. The 

C2/C3 are already slow. I more worry about C1.

Also doing two instead of one can have an impact even on C2+, especially
when the operation can be thousands of cycles.

-Andi
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