linux-kernel - Re: [RFC][PATCH 00/18] sched: Reduce runqueue lock contention -v4

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Date:	Tue, 4 Jan 2011 16:16:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	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 00/18] sched: Reduce runqueue lock contention -v4


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> Latest version of the scary patches...

Just to make it easier for others to see the rationale behind this series, see the 
numbers and limitations listed below.

	Ingo

------------------------->
As measured using: http://oss.oracle.com/~mason/sembench.c

$ echo 4096 32000 64 128 > /proc/sys/kernel/sem
$ ./sembench -t 2048 -w 1900 -o 0

unpatched: run time 30 seconds 639476 worker burns per second
patched:   run time 30 seconds 847526 worker burns per second

Still need to sort out all the races marked XXX (non-trivial), and its
x86 only for the moment.

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