linux-kernel - Re: 4.3 group scheduling regression

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Date:	Mon, 12 Oct 2015 10:48:07 +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 10:04 +0200, Peter Zijlstra wrote:
> On Mon, Oct 12, 2015 at 09:44:57AM +0200, Mike Galbraith wrote:
> 
> > 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.
> 
> Ohh, wait, Xorg and mplayer are _not_ in the same group? I was assuming
> you had your entire user session in 1 (auto) group and was competing
> against 8 manual cgroups.
> 
> So how exactly are things configured?

I turned autogroup on as to not have to muck about creating groups, so
Xorg is in its per session group, and each konsole instance in its.  I
launched groups via testo (aka konsole) -e <content> in a little script
to turn it loose at once to run for 100 seconds and kill itself, but
that's not necessary 'course.  Start 1 hog in 8 konsole tabs, and
mplayer in the 9th, ickiness follows.

	-Mike

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