linux-kernel - Re: [PATCH 00/21] sched: Reduce runqueue lock contention -v6

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Date:	Wed, 06 Apr 2011 13:00:10 +0200
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: [PATCH 00/21] sched: Reduce runqueue lock contention -v6

On Tue, 2011-04-05 at 17:23 +0200, Peter Zijlstra wrote:
> This patch series aims to optimize remote wakeups by moving most of the
> work of the wakeup to the remote cpu and avoid bouncing runqueue data
> structures where possible.
> 
> As measured by sembench (which basically creates a wakeup storm) on my
> dual-socket westmere:
> 
> $ for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do echo performance > $i; done
> $ echo 4096 32000 64 128 > /proc/sys/kernel/sem
> $ ./sembench -t 2048 -w 1900 -o 0
> 
> unpatched: run time 30 seconds 647278 worker burns per second
> patched:   run time 30 seconds 816715 worker burns per second
> 
> I've queued this series for .40.

Full diffstat per request

---
 arch/alpha/kernel/smp.c             |    3 +-
 arch/arm/kernel/smp.c               |    5 +-
 arch/blackfin/mach-common/smp.c     |    3 +
 arch/cris/arch-v32/kernel/smp.c     |   13 +-
 arch/ia64/kernel/irq_ia64.c         |    2 +
 arch/ia64/xen/irq_xen.c             |   10 +-
 arch/m32r/kernel/smp.c              |    4 +-
 arch/mips/cavium-octeon/smp.c       |    2 +
 arch/mips/kernel/smtc.c             |    2 +-
 arch/mips/mti-malta/malta-int.c     |    2 +
 arch/mips/pmc-sierra/yosemite/smp.c |    4 +
 arch/mips/sgi-ip27/ip27-irq.c       |    2 +
 arch/mips/sibyte/bcm1480/smp.c      |    7 +-
 arch/mips/sibyte/sb1250/smp.c       |    7 +-
 arch/mn10300/kernel/smp.c           |    5 +-
 arch/parisc/kernel/smp.c            |    5 +-
 arch/powerpc/kernel/smp.c           |    4 +-
 arch/s390/kernel/smp.c              |    6 +-
 arch/sh/kernel/smp.c                |    2 +
 arch/sparc/kernel/smp_32.c          |    4 +-
 arch/sparc/kernel/smp_64.c          |    1 +
 arch/tile/kernel/smp.c              |    6 +-
 arch/um/kernel/smp.c                |    2 +-
 arch/x86/kernel/smp.c               |    5 +-
 arch/x86/xen/smp.c                  |    5 +-
 include/linux/mutex.h               |    2 +-
 include/linux/sched.h               |   23 +-
 init/Kconfig                        |    5 +
 kernel/mutex-debug.c                |    2 +-
 kernel/mutex-debug.h                |    2 +-
 kernel/mutex.c                      |    2 +-
 kernel/mutex.h                      |    2 +-
 kernel/sched.c                      |  622 +++++++++++++++++++----------------
 kernel/sched_debug.c                |    2 +-
 kernel/sched_fair.c                 |   23 ++-
 kernel/sched_features.h             |    6 +
 kernel/sched_idletask.c             |    2 +-
 kernel/sched_rt.c                   |   54 ++--
 kernel/sched_stoptask.c             |    5 +-
 39 files changed, 483 insertions(+), 380 deletions(-)

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