linux-kernel - Re: [PATCH] uprobe: Move arch_uprobe_optimize right after handlers execution

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Message-ID: <20251003114814.GA14763@redhat.com>
Date: Fri, 3 Oct 2025 13:48:14 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	Ingo Molnar <mingo@...nel.org>, Jann Horn <jannh@...gle.com>,
	Alejandro Colomar <alx@...nel.org>
Subject: Re: [PATCH] uprobe: Move arch_uprobe_optimize right after handlers
 execution

On 10/01, Jiri Olsa wrote:
>
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -2765,6 +2765,9 @@ static void handle_swbp(struct pt_regs *regs)
>  
>  	handler_chain(uprobe, regs);
>  
> +	/* Try to optimize after first hit. */
> +	arch_uprobe_optimize(&uprobe->arch, bp_vaddr);
> +
>  	/*
>  	 * If user decided to take execution elsewhere, it makes little sense
>  	 * to execute the original instruction, so let's skip it.
> @@ -2772,9 +2775,6 @@ static void handle_swbp(struct pt_regs *regs)
>  	if (instruction_pointer(regs) != bp_vaddr)
>  		goto out;
>  
> -	/* Try to optimize after first hit. */
> -	arch_uprobe_optimize(&uprobe->arch, bp_vaddr);
> -
>  	if (arch_uprobe_skip_sstep(&uprobe->arch, regs))
>  		goto out;

Acked-by: Oleg Nesterov <oleg@...hat.com>