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From: Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>
To: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Richard Cochran
	<richardcochran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
	Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
	Arnaldo Carvalho de Melo
	<acme-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	John Stultz <john.stultz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH 2/2] perf: Userspace software event and ioctl
Date: Mon, 29 Sep 2014 16:53:23 +0100	[thread overview]
Message-ID: <1412006003.3817.30.camel@hornet> (raw)
In-Reply-To: <20140929153257.GM4140-IIpfhp3q70z/8w/KjCw3T+5/BudmfyzbbVWyRVo5IupeoWH0uzbU5w@public.gmane.org>

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

  parent reply	other threads:[~2014-09-29 15:53 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-18 14:34 [PATCH 0/2] perf: User/kernel time correlation and event generation Pawel Moll
2014-09-18 14:34 ` [PATCH 1/2] perf: Add sampling of the raw monotonic clock Pawel Moll
     [not found]   ` <1411050873-9310-2-git-send-email-pawel.moll-5wv7dgnIgG8@public.gmane.org>
2014-09-29 15:28     ` Peter Zijlstra
     [not found]       ` <20140929152832.GL4140-IIpfhp3q70z/8w/KjCw3T+5/BudmfyzbbVWyRVo5IupeoWH0uzbU5w@public.gmane.org>
2014-09-29 15:45         ` Pawel Moll
2014-09-18 14:34 ` [PATCH 2/2] perf: Userspace software event and ioctl Pawel Moll
2014-09-23 17:02   ` Pawel Moll
2014-09-24  7:49     ` Ingo Molnar
     [not found]       ` <20140924074942.GB3797-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-09-25 17:20         ` Pawel Moll
2014-09-25 18:33           ` Ingo Molnar
     [not found]             ` <20140925183342.GB6854-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-09-26 10:48               ` Pawel Moll
2014-09-26 11:23                 ` Ingo Molnar
     [not found]                   ` <20140926112312.GB9870-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-09-26 11:26                     ` Pawel Moll
2014-09-26 11:31                       ` Ingo Molnar
2014-09-27 17:14             ` Frederic Weisbecker
     [not found]               ` <CAFTL4hy1d8twv2tGxc4EhCeDm7ApnH7SuK26W1yaekKhCrPMZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-09-29 14:52                 ` Pawel Moll
2014-09-29 15:32   ` Peter Zijlstra
     [not found]     ` <20140929153257.GM4140-IIpfhp3q70z/8w/KjCw3T+5/BudmfyzbbVWyRVo5IupeoWH0uzbU5w@public.gmane.org>
2014-09-29 15:53       ` Pawel Moll [this message]
2014-11-03 14:48         ` Tomeu Vizoso
2014-11-03 15:04           ` Pawel Moll
     [not found] ` <1411050873-9310-1-git-send-email-pawel.moll-5wv7dgnIgG8@public.gmane.org>
2014-09-18 15:02   ` [PATCH 0/2] perf: User/kernel time correlation and event generation Christopher Covington
     [not found]     ` <541AF40B.7070604-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-09-18 15:07       ` Pawel Moll
2014-09-18 15:48         ` Christopher Covington

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