linux-kernel - Re: [PATCH 02/11] perf tools: Add tracing

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Message-ID: <20150827224719.GE3596@codeblueprint.co.uk>
Date:	Thu, 27 Aug 2015 23:47:19 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	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>,
	Raphaël Beamonte <raphael.beamonte@...il.com>
Subject: Re: [PATCH 02/11] perf tools: Add tracing_path and remove unneeded
 functions

On Wed, 26 Aug, at 03:46:44PM, Jiri Olsa wrote:
> There's no need for find_tracing_dir, because perf already
> searches for debugfs/tracefs mount on start and populate
> tracing_events_path.
 
I'm getting a bit lost searching through the git history of these
functions. Why is it safe to delete these functions? Where did the old
user that required find_tracing_dir() to mount debugfs disappear to?

The code to do the mount of debugfs/tracefs when perf starts appears
to have been around for years. Is the mounting operation of
find_tracing_dir() just dead code?

-- 
Matt Fleming, Intel Open Source Technology Center
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