linux-kernel - Re: [PATCH 0/3] perf bench: Clean and add document for perf-bench

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Date:	Tue, 10 Nov 2009 14:17:38 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Frédéric Weisbecker 
	<fweisbec@...il.com>
Subject: Re: [PATCH 0/3] perf bench: Clean and add document for perf-bench


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

> This patch series cleans bench/bench.h for readability and
> adds new document describing perf-bench.
> 
> Hitoshi Mitake (3):
>   perf bench: Clean bench/bench.h
>   perf bench: Add new document of perf-bench
>   perf bench: Modify command-list.txt for the entry of perf-bench
> 
>  tools/perf/Documentation/perf-bench.txt |  120 +++++++++++++++++++++++++++++++
>  tools/perf/bench/bench.h                |   16 ++---
>  tools/perf/command-list.txt             |    1 +
>  3 files changed, 128 insertions(+), 9 deletions(-)
>  create mode 100644 tools/perf/Documentation/perf-bench.txt

Applied, thanks!

Btw., a small detail i noticed when running the pipe benchmark:

earth4:~/tip/tools/perf> ./perf bench sched pipe
(executing 1000000 pipe operations between two tasks)

	Total time:5.076 sec
		5.076232 usecs/op
		196996 ops/sec

when i typed 'perf bench sched pipe' nothing happened for several 
seconds. The command did not finish and no output was printed.

This might surprise users - it's always good to print a single line that 
we are processing a benchmark. Maybe this could be printed from the 
generic subcommand, something like:

  running sched/pipe benchmark ...

What do you think?

	Ingo
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