linux-kernel - Re: [PATCH 6/6] numa,sched: normalize faults

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Message-ID: <20140117150409.GJ11314@laptop.programming.kicks-ass.net>
Date:	Fri, 17 Jan 2014 16:04:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org,
	mingo@...hat.com, chegu_vinod@...com, mgorman@...e.de,
	Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH 6/6] numa,sched: normalize faults_from stats and weigh by
 CPU use

On Fri, Jan 17, 2014 at 09:51:44AM -0500, Rik van Riel wrote:
> On 01/17/2014 04:54 AM, Peter Zijlstra wrote:
> > On Fri, Jan 17, 2014 at 01:17:36AM -0500, riel@...hat.com wrote:
> >> +			/*
> >> +			 * Normalize the faults_from, so all tasks in a group
> >> +			 * count according to CPU use, instead of by the raw
> >> +			 * number of faults. This prevents the situation where
> >> +			 * the garbage collector totally dominates the stats,
> >> +			 * and the access patterns of the worker threads are
> >> +			 * ignored.
> >> +			 */
> > 
> > Instead of focusing on the one example (GC) here, I would suggest
> > saying something along the lines of: Tasks with little runtime have
> > little over-all impact on throughput and thus their faults are less
> > important.
> 
> Thanks for the review, I have updated the comment
> accordingly.
> 
> Does anybody else have comments on this series, or should
> I start begging for Acked-by: and Reviewed-by: lines? :)

I still need to get me head around part of the previous patches, and I
suppose Mel might have a look, give it a few days ;-)
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