Re: Fwd: perf trace cannot work with software events ?

[David Ahern <dsahern@gmail.com>]

On 03/26/11 08:00, zhao bao wrote:
> 2011/3/26 David Ahern <dsahern@gmail.com>:
>> On 03/26/11 06:31, zhao bao wrote:
>>>> It's used to trace kernel space page faults, not for userspace code.
>>>>
>>>> Lin Ming
>>>>
>>>
>>> From the ouput of "perf report" command, I think  perf can record the
>>> page faults from userspace code.
>>>
>>> [root@localhost lab]# perf record -R -c 1  -d  -e  faults ./hello
>>> hello,world
>>
>> '-e faults' is a software event. perf-trace does not handle S/W events.
>> perf-trace has been renamed to perf-script, and perf-script recently
>> gained the ability to dump S/W events:
>>
>> https://lkml.org/lkml/2011/3/10/3
>>
>> David
>>
> Thanks. How can I apply your patch?  May I need upgrade to 2.6.38?

You can compile latest perf userpsace and it should work with files from
older kernels.

David