From: Vince Weaver <vincent.weaver@maine.edu>
Date: Tue, 9 Jun 2015 16:07:01 -0400 (EDT)
To: Steven Rostedt <rostedt@goodmis.org>
cc: Vince Weaver <vincent.weaver@maine.edu>, David Ahern <dsahern@gmail.com>,
        linux-kernel@vger.kernel.org, Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Stephane Eranian <eranian@gmail.com>, Jiri Olsa <jolsa@redhat.com>
Subject: Re: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose?
In-Reply-To: <20150609155506.3c7d5fc3@gandalf.local.home>
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References: <alpine.DEB.2.20.1506091423570.9662@vincent-weaver-1.umelst.maine.edu> <55773DA3.6070808@gmail.com> <alpine.DEB.2.20.1506091547180.9662@vincent-weaver-1.umelst.maine.edu> <20150609155506.3c7d5fc3@gandalf.local.home>
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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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