linux-kernel - Re: [PATCH] cpuidle: menu: use nr_running instead of cpuload for calculating perf mult

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Date:	Mon, 04 Jun 2012 17:08:29 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Vladimir Davydov <vdavydov@...allels.com>,
	Ingo Molnar <mingo@...e.hu>, Len Brown <lenb@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuidle: menu: use nr_running instead of cpuload for
 calculating perf mult

On Mon, 2012-06-04 at 06:48 -0700, Arjan van de Ven wrote:
> it's not about busy, it's about performance sensitive.
> it's not a super nice proxy, no argument, but it's one of the few long
> term ones we have.
> 
I'm still not seeing how it makes any sense at all. Is there an actual
workload here this matters?

It seems to me your own history of idle guestimation is the best measure
there is for this. If you're shown to be too agressive, grow the window,
otherwise shrink it.

You can make that adjustment as slow as you like to include as much
history as you think you need.


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