linux-kernel - Re: [RFC] sched: The removal of idle

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Message-ID: <1361158953.14352.17.camel@marge.simpson.net>
Date:	Mon, 18 Feb 2013 04:42:33 +0100
From:	Mike Galbraith <efault@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Clark Williams <clark@...hat.com>,
	Andrew Theurer <habanero@...ibm.com>
Subject: Re: [RFC] sched: The removal of idle_balance()

On Sun, 2013-02-17 at 16:54 -0500, Steven Rostedt wrote:
> On Sun, 2013-02-17 at 08:14 +0100, Mike Galbraith wrote:
> 
> > (And puts a dent in x264 ultrafast) 
 
> What about my last patch? The one that avoids idle_balance() if the
> previous task was in a task_uninterruptible state. That one gave the
> same performance increase that removing idle_balance() did on my box.

I didn't try it, figuring it was pretty much the same as turning it off,
but just did.  Patch (-typo) has no effect on either x264 or hackbench
(surely will for -rt, but rt tasks here aren't sent to burn in rt hell).

-Mike

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