linux-kernel - Re: 4.3 group scheduling regression

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Message-ID: <20151012005351.GJ11102@intel.com>
Date:	Mon, 12 Oct 2015 08:53:51 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 4.3 group scheduling regression

Good morning, Peter.

On Mon, Oct 12, 2015 at 10:04:07AM +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?
 
Hmm... my impression is the naughty boy mplayer (+Xorg) isn't favored, due 
to the per CPU group entity share distribution. Let me dig more.

Sorry.
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