linux-kernel - Re: [PATCH v6 5/6] tracing: Show inode and device major:minor in deferred user space stacktrace

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Message-ID: <20250828171748.07681a63@batman.local.home>
Date: Thu, 28 Aug 2025 17:17:48 -0400
From: Steven Rostedt <rostedt@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 bpf@...r.kernel.org, x86@...nel.org, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Josh Poimboeuf <jpoimboe@...nel.org>, Peter Zijlstra
 <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, Jiri Olsa
 <jolsa@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung
 Kim <namhyung@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Andrii
 Nakryiko <andrii@...nel.org>, Indu Bhagat <indu.bhagat@...cle.com>, "Jose
 E. Marchesi" <jemarch@....org>, Beau Belgrave <beaub@...ux.microsoft.com>,
 Jens Remus <jremus@...ux.ibm.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Florian Weimer <fweimer@...hat.com>, Sam James
 <sam@...too.org>, Kees Cook <kees@...nel.org>, "Carlos O'Donell"
 <codonell@...hat.com>
Subject: Re: [PATCH v6 5/6] tracing: Show inode and device major:minor in
 deferred user space stacktrace

On Thu, 28 Aug 2025 14:06:39 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> So you can certainly use siphash for hashing, but make sure to not use
> the same secret key that the printing does.

Right, I just meant to use the same algorithm. The key would be different.

> 
> As to the ID to hash, I actually think a 'struct file *' might be the
> best thing to use - that's directly in the vma, no need to follow any
> other pointers for it.

But that's unique per task, right? What I liked about the f_inode
pointer, is that it appears to be shared between tasks.

I only want to add a new hash and print the path for a new file. If
several tasks are using the same file (which they are with the
libraries), then having the hash be the same between tasks would be
more efficient.

-- Steve