linux-kernel - Re: [PATCH 11/15] tools lib api: Add mount support for fs

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Message-ID: <20150904110025.1e84810c@gandalf.local.home>
Date:	Fri, 4 Sep 2015 11:00:25 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Raphaël Beamonte <raphael.beamonte@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Matt Fleming <matt@...eblueprint.co.uk>
Subject: Re: [PATCH 11/15] tools lib api: Add mount support for fs

On Fri, 4 Sep 2015 10:57:00 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:


> > AFAICS we do this only for debugfs and tracefs.. procfs
> > and sysfs are mounted most of the time anyway 
> 
> Note, if sysfs isn't already mounted, than nothing will get mounted by
> perf. As sysfs is a requirement to get to /sys/kernel/trace and debug.

I will also add that the reason the /sys/kernel/debug directory is
created when DEBUGFS is enabled, was specifically so that tools had a
place to automatically mount it when needed. That was the entire
purpose of that directory.

-- Steve

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