linux-kernel - Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors

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Message-ID: <20080305070454.3df78593@mjolnir.drzeus.cx>
Date:	Wed, 5 Mar 2008 07:04:54 +0100
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Dave Jones <davej@...emonkey.org.uk>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Adam Belay <abelay@...ell.com>,
	Lee Revell <rlrevell@...-job.com>,
	linux-pm@...ts.linux-foundation.org, Pavel Machek <pavel@....cz>
Subject: Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors

On Tue, 4 Mar 2008 19:34:06 +0100
Andi Kleen <andi@...stfloor.org> wrote:

> On Tue, Mar 04, 2008 at 07:04:46PM +0100, Pierre Ossman wrote:
> > 
> > I don't think I quite see the point. If we can't force an update, then
> > it doesn't really help us knowing if the jiffies value is stale or not.
> 
> What do you mean with force an update? The system always does an 
> jiffies update automatically after idle wakeup. It's just that if you add 
> code to the code path that uses jiffies you have to make sure it is after the 
> standard update, otherwise you'll see a stale value.
> 

I still don't follow. Perhaps you can express it in pseudo code? If I have a stale value that I cannot refresh, knowing that it is stale doesn't change anything.


-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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