linux-kernel - Re: [RESEND][PATCH v15 2/4] perf: Support deferred user callchainshttps://lore.kernel.org/linux-trace-kernel/20250827193644.527334838@...nel.org/

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Message-ID: <20250923062848.0bc4ff2b@batman.local.home>
Date: Tue, 23 Sep 2025 06:28:48 -0400
From: Steven Rostedt <rostedt@...nel.org>
To: Peter Zijlstra <peterz@...radead.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>, 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>, Linus
 Torvalds <torvalds@...ux-foundation.org>, 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: [RESEND][PATCH v15 2/4] perf: Support deferred user
 callchainshttps://lore.kernel.org/linux-trace-kernel/20250827193644.527334838@...nel.org/

On Tue, 23 Sep 2025 11:38:21 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, Sep 23, 2025 at 05:35:15AM -0400, Steven Rostedt wrote:
> 
> > I even pushed this to a git tree. Not sure why it didn't get flagged.  
> 
> I've been looking at this... how do I enable CONFIG_UWIND_USER ?

Hmm, maybe that's why it wasn't flagged.

> 
> I suspect the problem is that its impossible to actually compile/use
> this code.

It needs an arch to enable it. Here's the x86 patches that I was hoping
would get in too:

  https://lore.kernel.org/linux-trace-kernel/20250827193644.527334838@kernel.org/

Hmm, but I had a branch that applied all the necessary patches :-/

-- Steve