linux-kernel - Re: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator driver

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Date:	Thu, 2 Oct 2008 10:37:00 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Mike Travis <travis@....com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>, rpurdie@...ys.net,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator	driver

> Pavel Machek wrote:
> >> Another relevant point is that I will be adding a bit more functionality
> >> to disable the timer interrupt on truly "idle" cpus (like have been idle
> >> for some amount of seconds).  We would then use the "exit from idle"
> >> callback to reestablish the timer interrupt.  [This would allow them to
> >> enter power down states if appropriate.]
> > 
> > Should you look at nohz instead of reinventing it? 
> 
> Thanks, I did look at it.  Quite complex.  Maybe I'm missing something
> but I don't see how it fits in?  Are you saying I should be using

I seen your remark above about disabling timer interrupt on idle
cpus. That's exactly nohz functionality, right? Maybe I misunderstood
you and you meant "my monitoring interrupt" and not "generic system
timer interrupt"?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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