linux-kernel - Re: [patch] CFS (Completely Fair Scheduler), v2

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Message-ID: <20070417070132.GA27261@elte.hu>
Date:	Tue, 17 Apr 2007 09:01:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Gene Heskett <gene.heskett@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [patch] CFS (Completely Fair Scheduler), v2

* Ingo Molnar <mingo@...e.hu> wrote:

> ok - fortunately the delta between -v2-rc0 and -v2-final is pretty 
> small. One difference is the child-runs-first fix. To restore the 
> parent-runs-first logic, do this:
> 
> 	echo 0 > /proc/sys/kernel/sched_child_runs_first
> 
> does this make any difference?

ok, i've got something better to test: i separated the delta out into a 
more finegrained stack of 3 patches. You can pick them up from:

 http://redhat.com/~mingo/cfs-scheduler/older/sched-cfs-v2-rc0.patch
 http://redhat.com/~mingo/cfs-scheduler/older/sched-cfs-v2-rc0-preempt-fix.patch
 http://redhat.com/~mingo/cfs-scheduler/older/sched-cfs-v2-rc0-child-runs-first.patch
 http://redhat.com/~mingo/cfs-scheduler/older/sched-cfs-v2-rc0-misc.patch

i test-built and test-booted all 4 steps of this. The baseline -v2-rc0 
patch should be the one that works - you might want to double-check it, 
just to be sure. One of the other 3 patches ontop of this baseline 
causes the regression on your desktop. My current bet is on preempt-fix, 
so i have put that one first. The other one would be the second patch, 
child-runs-first. The misc patch should have no effect on behavior - but 
i've included it for completeness. (and i was wrong about the 'nice 
fix', it is not in this delta)

	Ingo
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