linux-kernel - Re: [PATCH 4/4] perf tools: Complete support for dynamic strings

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Date:	Mon, 31 Aug 2009 10:11:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 4/4] perf tools: Complete support for dynamic strings


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

> Complete support for __str_loc type strings of ftrace events which
> have dynamic offsets values set for each of them inside their sammples.
> 
> Before:
>         geany-5759  [000]     0.000000: lock_release: name
>         geany-5759  [000]     0.000000: lock_release: name
>         geany-5759  [000]     0.000000: lock_release: name
>   kondemand/0-362   [000]     0.000000: lock_release: name
>       pdflush-421   [000]     0.000000: lock_release: name
> 
> After:
>         geany-5759  [000]     0.000000: lock_release: &u->lock
>         geany-5759  [000]     0.000000: lock_release: key
>         geany-5759  [000]     0.000000: lock_release: &group->notification_mutex
>   kondemand/0-362   [000]     0.000000: lock_release: &rq->lock
>       pdflush-421   [000]     0.000000: lock_release: &rq->lock

I've applied all five patches, thanks Frederic!

Also, i think this makes perf trace quite functional already so i 
merged that topic (and these commits) into tracing/core, for v2.6.32 
merging.

One thing that i noticed which is still quite quirky are the 
parameters to perf record. (needing -R and the :r postfix to events) 
Could something more intuitive be done here?

Also, i think people would like to use wildcards in event 
specifiers, such as:

  perf record -e timer/*

To capture all timer events:

 hrtimer_cancel
 hrtimer_expire_entry
 hrtimer_expire_exit
 hrtimer_init
 hrtimer_start
 itimer_expire
 itimer_state
 timer_cancel
 timer_expire_entry
 timer_expire_exit
 timer_init
 timer_start

Instead of having to type:

perf record -e hrtimer_cancel -e hrtimer_expire_entry \
 -e hrtimer_expire_exit -e hrtimer_init -e hrtimer_start \
 -e itimer_expire -e itimer_state -e timer_cancel \
 -e timer_expire_entry -e timer_expire_exit -e timer_init \
 -e timer_start

which is not quite realistic.

	Ingo
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