Re: Queries on using PERF tool

[Chulmin Kim <cmkim@core.kaist.ac.kr>]

2012-11-28 오후 2:47, Shahina Rabbani 쓴 글:
> Hi,
>
> I am a new user of PERF tool. I have few questions to ask about the PERF tool.
> Please help me with the answers.
>
> Q1. Is it possible to use PERF tool on a piece of code? Say i have a process P1
> and the process has several functions F1, F2, F3. Is it possible to perform
> profilng only on F1 Function ??
>

As other profiling tools do, PERF also supports monitoring per function 
(per SYMBOL).

You can select the result related with the function you are interested in.

> Q2. Say i am using the PERF tool to counts some events depending on the clock
> value. If i change the clock value in between, then PERF tool can be able to
> understand the situation and generate the event counts according to the old and
> new clock values??

As far as I know, there is no such thing to change the event type 
dynamically. Why don't you just monitor both of them simultaneously?

If you really want this job to be done in only this way,
you can make your own script which can change the event for Perf based 
on the clock value (also monitored by Perf).



>
>
> Please Help.
>
> Thanks,
> Shahina Rabbani
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>