* How to use perf to log page faults
@ 2010-05-12 19:38 Taras Glek
2010-05-12 19:59 ` Frederic Weisbecker
2010-05-12 20:07 ` Andi Kleen
0 siblings, 2 replies; 5+ messages in thread
From: Taras Glek @ 2010-05-12 19:38 UTC (permalink / raw)
To: lkml
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
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: How to use perf to log page faults
2010-05-12 19:38 How to use perf to log page faults Taras Glek
@ 2010-05-12 19:59 ` Frederic Weisbecker
2010-05-12 21:18 ` Taras Glek
2010-05-12 20:07 ` Andi Kleen
1 sibling, 1 reply; 5+ messages in thread
From: Frederic Weisbecker @ 2010-05-12 19:59 UTC (permalink / raw)
To: Taras Glek; +Cc: lkml
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?
Thanks.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: How to use perf to log page faults
2010-05-12 19:59 ` Frederic Weisbecker
@ 2010-05-12 21:18 ` Taras Glek
2010-05-12 21:29 ` Frederic Weisbecker
0 siblings, 1 reply; 5+ messages in thread
From: Taras Glek @ 2010-05-12 21:18 UTC (permalink / raw)
To: Frederic Weisbecker; +Cc: lkml
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
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: How to use perf to log page faults
2010-05-12 21:18 ` Taras Glek
@ 2010-05-12 21:29 ` Frederic Weisbecker
0 siblings, 0 replies; 5+ messages in thread
From: Frederic Weisbecker @ 2010-05-12 21:29 UTC (permalink / raw)
To: Taras Glek; +Cc: lkml
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.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: How to use perf to log page faults
2010-05-12 19:38 How to use perf to log page faults Taras Glek
2010-05-12 19:59 ` Frederic Weisbecker
@ 2010-05-12 20:07 ` Andi Kleen
1 sibling, 0 replies; 5+ messages in thread
From: Andi Kleen @ 2010-05-12 20:07 UTC (permalink / raw)
To: Taras Glek; +Cc: lkml
Taras Glek <tglek@mozilla.com> writes:
> 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?
Some time ago I used systemtap to do this for my pbitmaps
works. This was the old systemtap script.
-Andi
probe vm.pagefault {
if (task_execname(task_current()) == "executable" && address < 0x100000000) {
printf("%u\n", address);
}
}
--
ak@linux.intel.com -- Speaking for myself only.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2010-05-12 19:38 How to use perf to log page faults Taras Glek
2010-05-12 19:59 ` Frederic Weisbecker
2010-05-12 21:18 ` Taras Glek
2010-05-12 21:29 ` Frederic Weisbecker
2010-05-12 20:07 ` Andi Kleen
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