linux-kernel - Re: [PATCH -next v1 0/3] kernel/events/uprobes: uprobe_write

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Message-ID: <20250305152055.GB28112@redhat.com>
Date: Wed, 5 Mar 2025 16:20:55 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: David Hildenbrand <david@...hat.com>,
	Andrii Nakryiko <andrii@...nel.org>, Jiri Olsa <jolsa@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-trace-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Russell King <linux@...linux.org.uk>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Tong Tiangen <tongtiangen@...wei.com>
Subject: Re: [PATCH -next v1 0/3] kernel/events/uprobes:
 uprobe_write_opcode() rewrite

On 03/04, David Hildenbrand wrote:
>
> Currently, uprobe_write_opcode() implements COW-breaking manually, which is
> really far from ideal.

To say at least ;)

David, thanks for doing this. I'll try to read 3/3 tomorrow, but I don't
think I can really help. Let me repeat, this code was written many years
ago, I forgot everything, and today my understanding of mm/ is very poor.
But I'll try anyway.

> Are there any uprobe tests / benchmarks that are worth running?

All I know about uprobe tests is that bpf people run a lot of tests which
use uprobes.

Andrii, Jiri, what you advise?

Oleg.