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

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Message-ID: <alpine.DEB.2.20.1506091605350.9662@vincent-weaver-1.umelst.maine.edu>
Date:	Tue, 9 Jun 2015 16:07:01 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose?

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.

Vince
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