linux-kernel - Re: [PATCH 2/5] tools lib api fs: Add tracefs mount helper functions

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Message-ID: <20150126143148.GA2122@krava.brq.redhat.com>
Date:	Mon, 26 Jan 2015 15:31:48 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 2/5] tools lib api fs: Add tracefs mount helper functions

On Mon, Jan 26, 2015 at 09:26:21AM -0500, Steven Rostedt wrote:
> On Mon, 26 Jan 2015 10:02:55 +0100
> Jiri Olsa <jolsa@...hat.com> wrote:
> 
> > > Note, WTF is perf checking the magic number for debugfs?? If events
> > > move, even if its at the same path, this will break perf!
> > 
> > good question.. it's there since 2009:
> >   f6bdafef2ab9 perf_counter: Add tracepoint support to perf list, perf stat
> > 
> > I guess we didn't want anyone to trick us with fake tracepoints ;-)
> 
> But that would be a feature not a bug. I could imagine admins doing
> this for some work around.
> 
> But can we nuke that check? I don't think it's very useful.

I'd be ok with that

jirka
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