linux-kernel - Re: 4.3 group scheduling regression

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Message-ID: <1444635897.3425.19.camel@gmail.com>
Date:	Mon, 12 Oct 2015 09:44:57 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Yuyang Du <yuyang.du@...el.com>
Subject: Re: 4.3 group scheduling regression

On Mon, 2015-10-12 at 09:23 +0200, Peter Zijlstra wrote:
> On Sun, Oct 11, 2015 at 07:42:01PM +0200, Mike Galbraith wrote:
> > (change subject, CCs)
> > 
> > On Sun, 2015-10-11 at 04:25 +0200, Mike Galbraith wrote:
> > 
> > > > Is the interactivity the same (horrible) at fe32d3cd5e8e (ie, before the
> > > > load tracking rewrite from Yuyang)?
> > 
> > It is the rewrite, 9d89c257dfb9c51a532d69397f6eed75e5168c35.
> 
> Just to be sure, so 9d89c257dfb9^1 is good, while 9d89c257dfb9 is bad?

Yeah, I went ahead and bisected.
 
> And *groan*, _just_ the thing I need on a monday morning ;-)

Sorry 'bout that.

It's odd to me that things look pretty much the same good/bad tree with
hogs vs hogs or hogs vs tbench (with top anyway, just adding up times).
Seems Xorg+mplayer more or less playing cross group ping-pong must be
the BadThing trigger.

	-Mike


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