linux-kernel - Re: [PATCH v2 2/2] perf: Userspace event

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Message-ID: <20140926112424.GC9870@gmail.com>
Date:	Fri, 26 Sep 2014 13:24:24 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	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 v2 2/2] perf: Userspace event


* Pawel Moll <pawel.moll@....com> wrote:

> On Fri, 2014-09-26 at 07:21 +0100, Namhyung Kim wrote:
>
> > It looks like what trace-marker in ftrace does..  We might 
> > connect output of the trace marker into a perf event somehow.
> 
> I can probably trace_marker's write handler do the same as the 
> new prctl() would do. [...]

Please keep this new facility separate, so that !ftrace kernels 
that have perf events enabled still have this facility, etc.

Thanks,

	Ingo
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