linux-kernel - Re: [PATCH 4/4] perf tools: Add support for breakpoint events in perf tools

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Message-ID: <20091123173817.GA23765@elte.hu>
Date:	Mon, 23 Nov 2009 18:38:17 +0100
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>,
	Paul Mackerras <paulus@...ba.org>,
	Prasad <prasad@...ux.vnet.ibm.com>
Subject: Re: [PATCH 4/4] perf tools: Add support for breakpoint events in
 perf tools


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

> Add the breakpoint events support with this new sysnopsis:
> 
> mem:addr[:access]
> 
> Where addr is a raw addr value in the kernel and access can be
> either [r][w][x]
> 
> Example to profile tasklist_lock:
> 
> 	$ grep tasklist_lock /proc/kallsyms
> 	ffffffff8189c000 D tasklist_lock
> 
> 	$ perf record -e mem:0xffffffff8189c000:rw -a -f -c 1

would be nice to also accept a plain cut & paste of an address in hexa 
without the 0x prefix, i.e.:
 	$ perf record -e mem:ffffffff8189c000:rw -a -f -c 1

plus perf stat gets surprised by this new event and prints 'unknown':

 $ grep tasklist_lock /proc/kallsyms 
 ffffffff81802000 D tasklist_lock
 $ perf stat -a -e mem:0xffffffff81802000 sleep 1

 Performance counter stats for 'sleep 1':

             64  unknown                 

    1.000833173  seconds time elapsed

	Ingo
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