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: <20250923103516.GE3419281@noisy.programming.kicks-ass.net>
Date: Tue, 23 Sep 2025 12:35:16 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Steven Rostedt <rostedt@...nel.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, Sep 23, 2025 at 06:28:48AM -0400, Steven Rostedt wrote:
> 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, let me go find that.