linux-kernel - Re: [PATCH] mm: remove unused mmap tracepoints

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Message-ID: <b694c72b-0873-4123-869c-134709341e19@lucifer.local>
Date: Wed, 28 May 2025 16:48:10 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Caleb Sander Mateos <csander@...estorage.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Eric Mueller <emueller@...estorage.com>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org,
        Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
        Pedro Falcato <pfalcato@...e.de>
Subject: Re: [PATCH] mm: remove unused mmap tracepoints

On Wed, May 28, 2025 at 11:45:49AM -0400, Steven Rostedt wrote:
> On Wed, 28 May 2025 08:16:24 -0700
> Caleb Sander Mateos <csander@...estorage.com> wrote:
>
> > Would you mind picking up this patch to remove some old tracepoints?
> > Liam has already given it a review.
>
> Someday I need to add code that lists the events that are never called. I
> can imagine that there's several tracepoints that are created and never
> used, and they still do waste memory :-(
>
> -- Steve

Who traces the tracepoints? A question as old as time...

Maybe reasonably straightforward with a clangd/ctags/etc. backend or
something to track usage?

In fact could do a quick-an'-dirty script to grep invocations and have a
person run down the results to double-check or sth?