linux-kernel - Re: [RFC][PATCH 00/17] sched: Reduce runqueue lock contention -v3

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Date:	Fri, 24 Dec 2010 14:15:41 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Frank Rowand <frank.rowand@...sony.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>,
	Oleg Nesterov <oleg@...hat.com>, Paul Turner <pjt@...gle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Yong Zhang <yong.zhang0@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 00/17] sched: Reduce runqueue lock contention -v3

On Fri, 2010-12-24 at 13:23 +0100, Peter Zijlstra wrote:
> This is the latest incarnation of my scary ttwu patch, its split up into
> tiny little pieces because at some point while working on the feedback from
> the last posting it all stopped working and tiny changes was the only way
> to find out wth I done wrong (I never did find out though, when I
> completely rewrote everything in tiny chunks it all magically worked again
> -- so I guess tglx is chuckling now).
> 
> Anyway, it still need a few more loose ends fixed, esp on 32bit there is
> the whole unlocked remote min_vruntime access where we can read partial
> updates and screw the timeline like problem. And I suppose there's a few
> more XXXs in there where I know things are needing TLC.
> 
> Also, I bet the eagle eyed lot Cc'ed will spot more holes, as all this is
> scary stuff :-)
> 
> Anyway, lots of thanks to Frank, Oleg, Ingo and others who commented on
> the last posting.
> 
> I guess most everybody is out having x-mas celebrations (and I will too not
> too long from now), so I expect replies to this won't happen until the new
> year, but who knows, maybe in between eating and drinking too much we all
> get an urge to stare at code.
> 
> Happy Holidays!

Also available from (once the mirror catches up):

git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-sched.git

---
 arch/x86/include/asm/spinlock.h |   26 ++-
 arch/x86/kernel/smp.c           |    1 +
 include/linux/mutex.h           |    2 +-
 include/linux/sched.h           |   23 +-
 kernel/mutex-debug.c            |    2 +-
 kernel/mutex-debug.h            |    2 +-
 kernel/mutex.c                  |    2 +-
 kernel/mutex.h                  |    2 +-
 kernel/sched.c                  |  542 ++++++++++++++++++++++-----------------
 kernel/sched_debug.c            |    2 +-
 kernel/sched_fair.c             |    5 +-
 kernel/sched_features.h         |    2 +
 kernel/sched_idletask.c         |    2 +-
 kernel/sched_rt.c               |   20 +-
 kernel/sched_stoptask.c         |    5 +-
 15 files changed, 371 insertions(+), 267 deletions(-)

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