linux-kernel - Re: [RFC patch] CFS fix place entity spread issue (v2)

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Message-ID: <alpine.LFD.2.00.1004181622120.14500@i5.linux-foundation.org>
Date:	Sun, 18 Apr 2010 16:23:26 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jarkko Nikula <jhnikula@...il.com>,
	Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC patch] CFS fix place entity spread issue (v2)



On Sun, 18 Apr 2010, Mathieu Desnoyers wrote:
> 
> Degradation of this particular workload is expected, because the nature of the
> large CFS spread issue favors Xorg: it gets litterally minutes of available
> vruntime, while most other threads (e.g. kernel build, audio playing, etc..)
> suffer from this.

In that case, I think your patch is fundamentally incorrect.

I care a _whole_ lot more about "usable desktop" than I care about some 
inane "available vruntime". If the current behavior breaks your vruntime 
rules, then the current behaviour is clearly _correct_.

			Linus
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