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

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Message-ID: <20250617174107.GB1613376@noisy.programming.kicks-ass.net>
Date: Tue, 17 Jun 2025 19:41:07 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: 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>,
	Sebastian Andrzej Siewior <bigeasy@...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 Tue, Jun 17, 2025 at 01:36:14PM -0400, Steven Rostedt wrote:
> From: Steven Rostedt <rostedt@...dmis.org>
> 
> In January 2015, tracefs was created to allow access to the tracing
> infrastructure without needing to compile in debugfs. When tracefs is
> configured, the directory /sys/kernel/tracing will exist and tooling is
> expected to use that path to access the tracing infrastructure.
> 
> To allow backward compatibility, when debugfs is mounted, it would
> automount tracefs in its "tracing" directory so that tooling that had hard
> coded /sys/kernel/debug/tracing would still work.
> 
> It has been over 10 years since the new interface was introduced, and all
> tooling should now be using it. Start the process of deprecating the old
> path so that it doesn't need to be maintained anymore.

I've always used /debug/tracing/ (because /debug is the right place to
mount debugfs). You're saying this is going away and will break all my
scripts?!