linux-kernel - Re: RFC: A proposal for power capping through forced idle in the Linux Kernel

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Message-ID: <20091223095239.GD24181@elf.ucw.cz>
Date:	Wed, 23 Dec 2009 10:52:39 +0100
From:	Pavel Machek <pavel@....cz>
To:	Salman Qazi <sqazi@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Rubin <mrubin@...gle.com>,
	Taliver Heath <taliver@...gle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: RFC: A proposal for power capping through forced idle in the
 Linux Kernel

Hi!

> > OTOH realtime people already have tools you could make good use of:
> > your power capping approach looks like 'high priority idle task that
> > needs to run for 2 seconds every 5 seconds' or something...
> >
> > Talk to rt people?
> 
> At the core of it, you are correct.  However, in our implementation it
> also avoids running when the system is already idle and operates at
> much finer granularities than seconds.

Seconds were examples, I suspect rt kernels need lower granularities,
to.

> Which specific tools are you referring to?  Real-time Linux as a whole
> is a trade off:  one gets predictable latency in exchange for some
> performance.  Any specific contacts that I should direct my inquiries
> to?

I guess Peter and Ingo (added to the Cc)....

Anyway, I guess that what you really want is to be able to change
priority of the idle threads, even making them realtime...
									Pavel
-- 
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