linux-kernel - Re: [RFC][PATCH] tracing: Deprecate auto-mounting tracefs in debugfs

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Message-ID: <20250618092728.GG1613376@noisy.programming.kicks-ass.net>
Date: Wed, 18 Jun 2025 11:27:28 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
	"linux-trace-users@...r.kernel.org" <linux-trace-users@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>
Subject: Re: [RFC][PATCH] tracing: Deprecate auto-mounting tracefs in debugfs

On Wed, Jun 18, 2025 at 09:21:02AM +0200, Sebastian Andrzej Siewior wrote:
> On 2025-06-17 20:00:23 [+0200], Peter Zijlstra wrote:
> > If I have to edit the mount table, I'll just keep it at /debug/tracing/.
> > Tracing is very much debug stuff anyway. While I knew there was tracefs,
> > I never knew there was another mount point.
> > 
> > Just annoying I now have to add two entries to every new machine.. Oh
> > well.
> 
> I don't know what you run but since Debian 11/ Bullseye (v5.10) this happens
> more or less on its own. systemd has the proper mount units:
> | # mount | grep trace
> | tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
> | # ls -lh /sys/kernel/debug/tracing/ > /dev/null
> | # mount | grep trace
> | tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
> | tracefs on /sys/kernel/debug/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
> 
> This of course doesn't work if you manually mount it to /debug. While a
> symlink would work, you still have to touch the boxes.

Mostly debian/testing. I prefer a mount from /etc/fstab, I tried a
symlink once but that is weird with tab completion for some reason.