linux-kernel - Re: [PATCH 2/2] perf: Userspace software event and ioctl

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Message-ID: <CAAObsKBw9VU3oZZSz5hV-rNXK2WAkjXeOgY_X1AF1Lpp9iLk7g@mail.gmail.com>
Date:	Mon, 3 Nov 2014 15:48:52 +0100
From:	Tomeu Vizoso <tomeu@...euvizoso.net>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Richard Cochran <richardcochran@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH 2/2] perf: Userspace software event and ioctl

On 29 September 2014 17:53, Pawel Moll <pawel.moll@....com> wrote:
> 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.

Hi Pawel,

are you still working on this? Would be happy to lend a hand if that
can speed things up.

Cheers,

Tomeu

> Pawel
>
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