Date: Mon, 23 Nov 2009 18:38:17 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Peter Zijlstra <peterz@infradead.org>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       Paul Mackerras <paulus@samba.org>, Prasad <prasad@linux.vnet.ibm.com>
Subject: Re: [PATCH 4/4] perf tools: Add support for breakpoint events in
 perf tools
Message-ID: <20091123173817.GA23765@elte.hu>
References: <1258987355-8751-1-git-send-email-fweisbec@gmail.com>
 <1258987355-8751-4-git-send-email-fweisbec@gmail.com>
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* Frederic Weisbecker <fweisbec@gmail.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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