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

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Date:	Wed, 12 May 2010 23:29:44 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Taras Glek <tglek@...illa.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: How to use perf to log page faults

On Wed, May 12, 2010 at 02:18:08PM -0700, Taras Glek wrote:
> 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?


Yeah, no problem on 2.6.34-rc7.

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