Messages in this thread | | | Subject | Re: [PATCH 2/2] perf: Userspace software event and ioctl | From | Pawel Moll <> | Date | Mon, 29 Sep 2014 16:53:23 +0100 |
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On Mon, 2014-09-29 at 16:32 +0100, Peter Zijlstra wrote: > Also none of the many words above describe > PERF_SAMPLE_USERSPACE_EVENT(), wth is that about?
Hopefully description of the v2 makes better job in this:
http://thread.gmane.org/gmane.linux.kernel/1793272/focus=4813
where it's already called "UEVENT" and was generated by write().
Before you get into this, though, the most important outcomes of both v1 and v2 discussions:
* Ingo suggested prctl(PR_TRACE_UEVENT, type, size, data, 0) as the way of generating such events (so the tracee doesn't have to know the fd to do ioctl); Frederic seems to have the same on his mind.
* Namhyung proposed sticking the userspace-originating events into the buffer as PERF_RECORD_UEVENT rather then PERF_SAMPLE_UEVENT.
Working on making both happen now.
Pawel
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