linux-kernel - Re: [PATCH] sched: make decaying sched_avg's variables happen on period boundary

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Message-ID: <20150708002212.GF31287@byungchulpark-X58A-UD3R>
Date:	Wed, 8 Jul 2015 09:22:13 +0900
From:	Byungchul Park <byungchul.park@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, pjt@...gle.com
Subject: Re: [PATCH] sched: make decaying sched_avg's variables happen on
 period boundary

On Wed, Jul 08, 2015 at 12:54:30AM +0200, Peter Zijlstra wrote:
> On Tue, Jul 07, 2015 at 02:42:56PM +0900, byungchul.park@....com wrote:
> > From: Byungchul Park <byungchul.park@....com>
> > 
> > decaying time happens on every period boundary. if it does not reach
> > the period boundary yet, the partial time needs to be kept so that
> > the time can be decayed on exactly period boundary at next update.
> > 
> > sa->avg_period is not appropriate for getting partial delta_w because
> > the value is a decayed average value, with which we cannnot get partial
> > delta at all which does not reach the period boundary yet.
> 
> lkml.kernel.org/r/1435018085-7004-1-git-send-email-yuyang.du@...el.com
> 
> There is a comprehensive rewrite of all this under consideration.

thank you, peter :)

i will check it.

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