linux-kernel - Re: [PATCH v11 00/14] unwind_user: x86: Deferred unwinding infrastructure

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Message-ID: <878ql9mlzn.fsf@oldenburg.str.redhat.com>
Date: Mon, 30 Jun 2025 14:50:52 +0200
From: Florian Weimer <fweimer@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: 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>,  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>,  Linus Torvalds
 <torvalds@...ux-foundation.org>,  Andrew Morton
 <akpm@...ux-foundation.org>,  Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v11 00/14] unwind_user: x86: Deferred unwinding
 infrastructure

* Steven Rostedt:

> SFrames is now supported in gcc binutils and soon will also be supported
> by LLVM.

Is the LLVM support discussed here?

  [RFC] Adding SFrame support to llvm
  <https://discourse.llvm.org/t/rfc-adding-sframe-support-to-llvm/86900>

Or is there a secone effort?

> I have more patches on top of this series that add perf support, ftrace
> support, sframe support and the x86 fix ups (for VDSO). But each of those
> patch series can be worked on independently, but they all depend on this
> series (although the x86 specific patches at the end isn't necessarily
> needed, at least for other architectures).

Related to perf support: I'm writing up the SFrame change proposal for
Fedora, and I want to include testing instructions.  Any idea yet what a
typical “perf top” or “perf report” command line would look like?

Thanks,
Florian