linux-kernel - Re: [PATCHv6 perf/core 10/22] uprobes/x86: Add support to optimize uprobes

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Message-ID: <20250819191744.GN3289052@noisy.programming.kicks-ass.net>
Date: Tue, 19 Aug 2025 21:17:44 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Jiri Olsa <olsajiri@...il.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	x86@...nel.org, Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Hao Luo <haoluo@...gle.com>, Steven Rostedt <rostedt@...dmis.org>,
	Alan Maguire <alan.maguire@...cle.com>,
	David Laight <David.Laight@...lab.com>,
	Thomas Weißschuh <thomas@...ch.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCHv6 perf/core 10/22] uprobes/x86: Add support to optimize
 uprobes

On Mon, Jul 28, 2025 at 11:34:56PM +0200, Jiri Olsa wrote:

> Peter, do you have more comments?

I'm not really a fan of this syscall is faster than exception stuff. Yes
it is for current hardware, but I suspect much of this will be a
maintenance burden 'soon'.

Anyway, I'll queue the patches tomorrow. I think the shadow stack thing
wants fixing though. The rest we can prod at whenever.