linux-kernel - Re: [PATCH 1/3] lockdep: Move lock events under lockdep recursion protection

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Message-ID: <20100310001050.GG5058@nowhere>
Date:	Wed, 10 Mar 2010 01:10:51 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH 1/3] lockdep: Move lock events under lockdep recursion
	protection

On Tue, Mar 09, 2010 at 04:18:58PM +0900, Hitoshi Mitake wrote:
> Thanks a lot, Frederic!
>
> I tested perf lock with your patch, result is like this,
>
> Typical scores:
>
> before:
> % sudo ./perf lock record ./perf bench sched messaging
> # Running sched/messaging benchmark...
> # 20 sender and receiver processes per group
> # 10 groups == 400 processes run
>
>      Total time: 3.265 [sec]
> [ perf record: Woken up 0 times to write data ]
> [ perf record: Captured and wrote 143.952 MB perf.data (~6289344 samples) ]
>
> after:
> % sudo ./perf lock record ./perf bench sched messaging
> # Running sched/messaging benchmark...
> # 20 sender and receiver processes per group
> # 10 groups == 400 processes run
>
>      Total time: 1.943 [sec]                       <--- about x1.5 faster!
> [ perf record: Woken up 0 times to write data ]
> [ perf record: Captured and wrote 98.161 MB perf.data (~4288734 samples)  
> ]   <--- size of perf.data is also reduced
>


Oh great! Yeah this recursion thing was really bad.

Thanks.

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