linux-kernel - Re: [PATCH v16 0/4] perf: Support the deferred unwinding infrastructure

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Message-ID: <20251024092926.GI4068168@noisy.programming.kicks-ass.net>
Date: Fri, 24 Oct 2025 11:29:26 +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: [PATCH v16 0/4] perf: Support the deferred unwinding
 infrastructure

On Thu, Oct 23, 2025 at 05:00:02PM +0200, Peter Zijlstra wrote:

> Trouble is, pretty much every unwind is 510 entries long -- this cannot
> be right. I'm sure there's a silly mistake in unwind/user.c but I'm too
> tired to find it just now. I'll try again tomorrow.

PEBKAC