linux-kernel - Re: [RFC][PATCH 7/7] Adding general performance benchmarking subsystem to perf.

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Date:	Tue, 3 Nov 2009 08:46:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric_Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC][PATCH 7/7] Adding general performance benchmarking
	subsystem to perf.


* Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:

> 
> Adding general performance benchmarking subsystem to perf.
> This patch adds builtin-bench-pipe.c
> 
> builtin-bench-pipe.c is a benchmark program
> to measure performance of pipe() system call.
> This benchmark is based on pipe-test-1m.c by Ingo Molnar.
> http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c
> 
> Signed-off-by: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Mike Galbraith <efault@....de>
> ---
>  tools/perf/builtin-bench-pipe.c |   89 +++++++++++++++++++++++++++++++++++++++
>  1 files changed, 89 insertions(+), 0 deletions(-)
>  create mode 100644 tools/perf/builtin-bench-pipe.c
> 
> diff --git a/tools/perf/builtin-bench-pipe.c b/tools/perf/builtin-bench-pipe.c
> new file mode 100644
> index 0000000..081515e
> --- /dev/null
> +++ b/tools/perf/builtin-bench-pipe.c
> @@ -0,0 +1,89 @@
> +/*
> + *
> + * builtin-bench-pipe.c
> + *
> + * pipe: Benchmark for pipe()
> + *
> + * Based on pipe-test-1m.c by Ingo Molnar <mingo@...hat.com>
> + *  http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c
> + * Ported to perf by Hitoshi Mitake <mitake@....info.waseda.ac.jp>
> + *
> + */

Ok, i think there's going to be quite a few of these benchmarks, so i'd 
suggest you start a new directory for the benchmark modules: 
tools/perf/bench/ for example.

We'll still have tools/perf/builtin-bench.c which represents the highest 
level 'perf bench' tool - and new modules can be added by adding them to 
bench/.

What do you think?

All in one, i very much like the modular direction you are taking here. 

There will be a handful of more details i'm sure but once there's a good 
base we can commit it - would you / will you be interested in extending 
it further and adding more benchmark modules as well?

There's quite a few useful small benchmarks that people are using to 
measure the kernel. Having a good collection of them in one place, with 
standardized options and standardized output would be very useful.

	Ingo
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