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

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Date:	Tue, 17 Apr 2007 17:45:19 +0300
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	Ingo Molnar <mingo@...e.hu>
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>, Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [patch] CFS (Completely Fair Scheduler), v2

17 Nis 2007 Sal tarihinde, Ingo Molnar şunları yazmıştı: 
> > Sorry for delayed response but i just find some free time, do you
> > still want me to test mainline + "parent-runs first" patch or will i
> > drop that one and test v2 which can change default behaviour?
>
> i suspect for now it would be sufficient if you could check the v2
> patch.
>
> if it _works_, please try this:
>
>     echo 0 > /proc/sys/kernel/sched_child_runs_first
>
> this should break Kaffeine again :)
>
> (if it doesnt work then the Kaffeine problem is unrelated to
> child-runs-first.)

OK, i tested both plain -rc7 and -rc7 + CFSv2 with while 
sched_child_runs_first enabled/disabled.

I'm always using same video file and try to reproduce freeze with constantly 
pressing forward/backward buttons. With CFS 2-3 forward/backward attempt 
reproduces this behaviour. 

And here are the results.

Mainline still has no issues with both xine-lib/kaffeine and xine-ui 
(kaffeine-0.8.4, xine-lib-1.1.5 [both xcb enabled], xine-ui-0.99.4). I really 
try hard to reproduce the freeze, but i can't...

And CFSv2 still fails for both child_runs_first and parent_runs_first cases 
with same strace output (FUTEX_WAIT).

If you want me to test something else just ask please :) 

Cheers
-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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