linux-kernel - Re: [PATCH 05/10] perf/uprobe: SRCU-ify uprobe->consumer list

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Message-ID: <20240709153444.GH28495@redhat.com>
Date: Tue, 9 Jul 2024 17:34:45 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: mingo@...nel.org, andrii@...nel.org, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, mhiramat@...nel.org, jolsa@...nel.org,
	clm@...a.com, paulmck@...nel.org
Subject: Re: [PATCH 05/10] perf/uprobe: SRCU-ify uprobe->consumer list

On 07/09, Peter Zijlstra wrote:
>
> Hmm, easiest would be to add a seqcount to register_mutex and simply
> skip the remove case when odd.

probably yes,

> Then the handler might get a few extra (unwanted) calls, but it should
> be able to handle them, they're fundamentally not different from the
> first one where it says REMOVE. Right?

plus the handler can never assume that UPROBE_HANDLER_REMOVE won't be
ignored, another consumer can want to trace this task.

Oleg.