Re: [PATCH] Perf: bug fix: distinguish between rename and exec

[David Ahern]

On 2/15/12 10:22 AM, Luigi Semenzato wrote:
> Any process that makes a prctl(PR_SET_NAME) call loses its mappings,
> no matter when makes the call.  The perf records for that process look
> like this:
>
> COMM (for the initial exec)
> MMAP (the executable)
> MMAP (1st dll)
> MMAP (2nd dll)
> ...
> COMM (for the prctl)
>
> The second COMM flushes the old mappings, and all samples from then on
> cannot be classified.  This is easily reproducible with a small
> program, which I would be happy to send.

Ok, I see that now.

Thanks,
David

> I found this while trying to use perf with Chrome on Chrome OS.
> Chrome forks and execs all the time, and calls prctl() in the thread
> library.

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