linux-kernel - Re: perf/ftrace: does PERF_EVENT_IOC_SET

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Message-ID: <20150609201134.GJ3136@kernel.org>
Date:	Tue, 9 Jun 2015 17:11:34 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Stephane Eranian <eranian@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose?

Em Tue, Jun 09, 2015 at 04:07:01PM -0400, Vince Weaver escreveu:
> On Tue, 9 Jun 2015, Steven Rostedt wrote:
> 
> > What kernel are you using? You may need to update perf.
> > 
> > We switched to a tracefs filesystem, but the old perf wont read any
> > events if it's not located in debugfs. That is, it actually tested
> > which filesystem the event files were mounted on, and if they didn't
> > match the debugfs mount type, it ignored them. That was fixed recently.
> 
> I am running 4.1-rc7 and was trying to use perf_4.0.
> 
> If I use the kernel's version of perf it works.
> 
> sigh.

Indeed, its always a shame when that happens, I had a similar reaction
when Steven told it was validating the filesystem type, completely
unnecessary, has been there for a long time :-\

Date:   Tue Jul 21 12:20:22 2009 -0400

    perf_counter: Add tracepoint support to perf list, perf stat

- Arnaldo
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