linux-kernel - Re: [patch] sched/fair: Move se->vruntime normalization state into struct sched

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Message-ID: <1463910760.3698.3.camel@gmail.com>
Date:	Sun, 22 May 2016 11:52:40 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Pavan Kondeti <pkondeti@...eaurora.org>,
	Ben Segall <bsegall@...gle.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Paul Turner <pjt@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>, byungchul.park@....com,
	Andrew Hunter <ahh@...gle.com>
Subject: Re: [patch] sched/fair: Move se->vruntime normalization state into
 struct sched_entity

On Sun, 2016-05-22 at 11:36 +0200, Peter Zijlstra wrote:
> On Sun, May 22, 2016 at 09:00:01AM +0200, Mike Galbraith wrote:
> > On Sat, 2016-05-21 at 21:00 +0200, Mike Galbraith wrote:
> > > On Sat, 2016-05-21 at 16:04 +0200, Mike Galbraith wrote:
> > > 
> > > > Wakees that were not migrated/normalized eat an unwanted min_vruntime,
> > > > and likely take a size XXL latency hit.  Big box running master bled
> > > > profusely under heavy load until I turned TTWU_QUEUE off.
> > 
> > May as well make it official and against master.today.  Fly or die
> > little patchlet.
> > 
> > sched/fair: Move se->vruntime normalization state into struct sched_entity
> 
> Yeah, I used to have a patch like this; but for debugging. I don't
> particularly like carrying this information other than for verification
> because it means we either do too much or too little normalization.
> 
> I'll try and have a look on Monday, but I got some real-life things to
> sort out first..

Ok (flush, say hi to the goldfish little patchlet). I don't care how it
gets fixed, only that it does, and yours will likely be prettier :)

	-Mike