linux-kernel - Re: [PATCHv6 perf/core 09/22] uprobes/x86: Add uprobe syscall to speed up uprobe

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Message-ID: <20250720113816.GA23012@redhat.com>
Date: Sun, 20 Jul 2025 13:38:17 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: 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>,
	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>
Subject: Re: [PATCHv6 perf/core 09/22] uprobes/x86: Add uprobe syscall to
 speed up uprobe

On 07/20, Jiri Olsa wrote:
>
> Adding new uprobe syscall that calls uprobe handlers for given
> 'breakpoint' address.
>
> The idea is that the 'breakpoint' address calls the user space
> trampoline which executes the uprobe syscall.
>
> The syscall handler reads the return address of the initial call
> to retrieve the original 'breakpoint' address. With this address
> we find the related uprobe object and call its consumers.
>
> Adding the arch_uprobe_trampoline_mapping function that provides
> uprobe trampoline mapping. This mapping is backed with one global
> page initialized at __init time and shared by the all the mapping
> instances.
>
> We do not allow to execute uprobe syscall if the caller is not
> from uprobe trampoline mapping.
>
> The uprobe syscall ensures the consumer (bpf program) sees registers
> values in the state before the trampoline was called.
>
> Acked-by: Andrii Nakryiko <andrii@...nel.org>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

My ack still stands,

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