Re: [PATCH 2/2] perf: Userspace software event and ioctl
From: Pawel Moll
Date: Mon Sep 29 2014 - 11:53:41 EST
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:
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.
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