linux-kernel - Re: [PATCH 4/4] perf tools: Add perf trace

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Date:	Mon, 17 Aug 2009 16:40:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Clark Williams <williams@...hat.com>,
	Jon Masters <jonathan@...masters.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>, Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Anton Blanchard <anton@...ba.org>
Subject: Re: [PATCH 4/4] perf tools: Add perf trace


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> This adds perf trace into the set of perf tools. It is written to 
> fetch the tracepoints samples from perf events and display them, 
> according to the events informations given by the debugfs files 
> through the util/trace* tools.
> 
> It is a rough first shot and doesn't yet handle the cpu, 
> timestamps fields and some other things.
> 
> Example:
> 
> perf record -f -e workqueue:workqueue_execution:record -F 1 -a
> perf trace
> 
>        kblockd/0-236   [000]     0.000000: workqueue_execution: thread=:236 func=cfq_kick_queue+0x0
>      kondemand/0-360   [000]     0.000000: workqueue_execution: thread=:360 func=do_dbs_timer+0x0
>      kondemand/0-360   [000]     0.000000: workqueue_execution: thread=:360 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
>      kondemand/1-361   [000]     0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0

Nice!

> Todo:
> 
> - A lot of things!

heh :-)

To help this move forward i've put the patches into 
tip:perfcounters/tracing. We might still rebase that branch, should 
it become necessary, before merging it into perfcounters/core - but 
it should give a first glimpse to people who want to try this.

A first bugreport:

took me some time to figure out that i need to pass in -R to create 
a trace.info. I think we want to share the namespace anyway - 
there's no real difference between perf.data and trace.info - both 
contain trace records.

once i added -R i ran into this problem:

# perf record -R -f -e workqueue:workqueue_execution:record -F 1 -a
^C
[ perf record: Captured and wrote 0.250 MB perf.data (~10928 samples) ]

aldebaran:/home/mingo/linux/linux/tools/perf> perf trace
  Fatal: bad op token )
version = 0.5

Some missing patch?

	Ingo
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