linux-kernel - Re: [PATCH RFCv3 00/23] uprobes: Add support to optimize usdt probes on x86

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Message-ID: <20250320122343.GC11256@redhat.com>
Date: Thu, 20 Mar 2025 13:23:44 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Jiri Olsa <jolsa@...nel.org>, David Hildenbrand <david@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Eyal Birger <eyal.birger@...il.com>, kees@...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>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Alan Maguire <alan.maguire@...cle.com>,
	David Laight <David.Laight@...LAB.COM>,
	Thomas Weißschuh <thomas@...ch.de>
Subject: Re: [PATCH RFCv3 00/23] uprobes: Add support to optimize usdt probes
 on x86_64

On 03/20, Jiri Olsa wrote:
>
> hi,
> this patchset adds support to optimize usdt probes on top of 5-byte
> nop instruction.

Just in case... This series conflicts with (imo very important) changes
from David,

	[PATCH v2 0/3] kernel/events/uprobes: uprobe_write_opcode() rewrite
	https://lore.kernel.org/all/20250318221457.3055598-1-david@redhat.com/

I think they should be merged first.

(and I am not sure yet, but it seems that we should cleanup (fix?) the
 update_ref_ctr() logic before other changes).

Oleg.