linux-kernel - Re: [PATCH perf/core 03/11] perf: Add support to attach standard unique uprobe

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Message-ID: <20250903115912.GD18799@redhat.com>
Date: Wed, 3 Sep 2025 13:59:13 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrii Nakryiko <andrii@...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>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core 03/11] perf: Add support to attach standard
 unique uprobe

Slightly off-topic, but

On 09/02, Jiri Olsa wrote:
>
> @@ -11144,7 +11147,7 @@ static int perf_uprobe_event_init(struct perf_event *event)
>  {
>  	int err;
>  	unsigned long ref_ctr_offset;
> -	bool is_retprobe;
> +	bool is_retprobe, is_unique;
>  
>  	if (event->attr.type != perf_uprobe.type)
>  		return -ENOENT;
> @@ -11159,8 +11162,9 @@ static int perf_uprobe_event_init(struct perf_event *event)
>  		return -EOPNOTSUPP;
>  
>  	is_retprobe = event->attr.config & PERF_PROBE_CONFIG_IS_RETPROBE;
> +	is_unique = event->attr.config & PERF_PROBE_CONFIG_IS_UNIQUE;
>  	ref_ctr_offset = event->attr.config >> PERF_UPROBE_REF_CTR_OFFSET_SHIFT;
> -	err = perf_uprobe_init(event, ref_ctr_offset, is_retprobe);
> +	err = perf_uprobe_init(event, ref_ctr_offset, is_retprobe, is_unique);

I am wondering why (with or without this change) perf_uprobe_init() needs
the additional arguments besides "event". It can look at event->attr.config
itself?

Same for perf_kprobe_init()...

Oleg.