linux-kernel - Re: [RFC perf/core 05/11] uprobes: Add mapping for optimized uprobe trampolines

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Message-ID: <20241121115353.GJ24774@noisy.programming.kicks-ass.net>
Date: Thu, 21 Nov 2024 12:53:53 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Jiri Olsa <olsajiri@...il.com>, Oleg Nesterov <oleg@...hat.com>,
	Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.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>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Alan Maguire <alan.maguire@...cle.com>,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC perf/core 05/11] uprobes: Add mapping for optimized uprobe
 trampolines

On Wed, Nov 20, 2024 at 04:07:38PM -0800, Andrii Nakryiko wrote:

> USDTs are meant to be "transparent" to the surrounding code and they
> don't mark any clobbered registers. Technically it could be added, but
> I'm not a fan of this.

Sure. Anyway, another thing to consider is FRED, will all of this still
matter once that lands? If FRED gets us INT3 performance close to what
SYSCALL has, then all this work will go unused.