linux-kernel - Re: [RFC] PyTimechart

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Message-ID: <AANLkTikumkBKwYTYIK63mT2i_hI4SAo-Eua0cx9OCHnD@mail.gmail.com>
Date:	Wed, 12 May 2010 15:37:27 +0200
From:	Pierre Tardy <tardyp@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Tom Zanussi <tzanussi@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	mathieu.desnoyers@...icios.com, arjan@...radead.org,
	ziga.mahkovec@...il.com
Subject: Re: [RFC] PyTimechart

> Plugging to the scripting API is really easy, run:
>
>        $ perf timechart record
>        $ sudo ./perf trace -g python
>        generated Python script: perf-trace.py

This is something that I want to try since I saw the perf scripting
patch, thanks for the recipe, I'll look at it in the next few days.

The next problem is that perf timechart record is frozen on the number
of event it records.
Pytimechart is able to display irq:* and workqueues:* events, as well
as trace_printks ( I dont know if perf is able to dump those )

I use trace_printk to mark the big traces with events I'm trying to debug.
Being able to look at ISR and workqueues is very useful, and there is
a special feature that warns when an ISR lasts more than 1ms.

For inclusion in mainline, this might take more time. The quality of
some portion of the code is far from being linux kernel's standards
:-}

Regards,
Pierre
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