linux-kernel - Re: How to use perf to log page faults

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Message-ID: <4BEB1B10.40200@mozilla.com>
Date:	Wed, 12 May 2010 14:18:08 -0700
From:	Taras Glek <tglek@...illa.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: How to use perf to log page faults

On 05/12/2010 12:59 PM, Frederic Weisbecker wrote:
> On Wed, May 12, 2010 at 12:38:30PM -0700, Taras Glek wrote:
>    
>> Hi,
>>  From the docs it seems that perf may be useful for logging page faults.
>> I tried
>> perf record -g -d -f -e page-faults<mycommand>
>> but all I got were PERF_RECORD_MMAP events.
>>
>> I'm using 2.6.32. Ideally I'd like to collect fault addresses and
>> userspace stacks that caused them. Isn't this what the page-fault event
>> is for?
>>
>> Taras
>>      
>
> Could you try with -c 1 ?
>
> Otherwise, does that work on the latest kernel?
>    
this just gets me PERF_RECORD_SAMPLE events which don't seem to be 
related to page-faults(ie they show up with/without -e page-faults).

I don't have the latest kernel installed here. Can you get perf 
page-fault events on your system?

Taras

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