linux-kernel - Re: [RFC 2/2] perf: Marker software event and ioctl

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Date:	Mon, 15 Sep 2014 18:18:37 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	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>,
	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: [RFC 2/2] perf: Marker software event and ioctl

On Sun, 2014-09-14 at 16:43 +0100, David Ahern wrote:
> >> Seems really similar to what I proposed in the past:

Yeah, it wasn't really hard to come with similar conclusions :-)

> >> https://lkml.org/lkml/2011/2/27/159
> >>
> >> Which was rejected.
> >
> > I took a look at that thread, but just barely, emphasis on that.
> >
> > Injecting something from userspace, a la ftrace, seems to be something,
> > as tglx mentioned, "buried" in that patchset.
> 
> Thomas object to an ioctl buried deep in a patch -- newbie mistake.
> 
> Peter objected to the ioctl https://lkml.org/lkml/2011/3/1/229
> 
> It was not userspace injecting random data into the stream but rather 
> forcing the sample to be generated and added to the stream.

I would like to hear from Peter and others. If not here, I'll get them
to talk next month on Linux Plumbers :-)

Pawel

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