linux-kernel - Re: [PATCH] futex: add FUTEX_SET

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Date:	Tue, 17 Nov 2009 08:16:06 -0800
From:	Darren Hart <dvhltc@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, Michel Lespinasse <walken@...gle.com>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH] futex: add FUTEX_SET_WAIT operation

Peter Zijlstra wrote:
> On Tue, 2009-11-17 at 09:18 +0100, Ingo Molnar wrote:
>> Would you be interested in adding it as a 'perf bench futex' testcase? 
>> That way kernel developers could monitor futex performance in the future 
>> as well.
>>
>> See 'perf bench' in the latest perf events tree:
>>
>>   http://people.redhat.com/mingo/tip.git/README
>>
>> Do 'cd tools/perf; make -j install' to install perf.
> 
> Darren has recently been putting a lot of effort in making a futex test
> suite:
> 
> http://git.kernel.org/?p=linux/kernel/git/dvhart/futextest.git
> 
> Its not yet complete, but hopefully it will soon be :-)
> 

Michael, would you be willing to include a version of this test in the 
above test suite? If so, then in keeping with the rest of the test 
suite, I would recommend splitting into two tests, one of each opcode 
being tested, and  add argument to define thread count. The run.sh 
script would then run each thread count as a separate test run.

-- 
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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