linux-kernel - Re: [PATCH bpf-next] bpf: Remove migrate_disable in kprobe_multi_link_prog

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Message-ID: <4348a5c5-8689-49a8-b59f-bf4ab2bbc74b@linux.dev>
Date: Tue, 5 Aug 2025 08:48:47 -0700
From: Yonghong Song <yonghong.song@...ux.dev>
To: Tao Chen <chen.dylane@...ux.dev>, song@...nel.org, jolsa@...nel.org,
 ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 martin.lau@...ux.dev, eddyz87@...il.com, john.fastabend@...il.com,
 kpsingh@...nel.org, sdf@...ichev.me, haoluo@...gle.com,
 mattbobrowski@...gle.com, rostedt@...dmis.org, mhiramat@...nel.org,
 mathieu.desnoyers@...icios.com
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next] bpf: Remove migrate_disable in
 kprobe_multi_link_prog_run



On 8/5/25 5:23 AM, Tao Chen wrote:
> bpf program should run under migration disabled, kprobe_multi_link_prog_run
> called the way from graph tracer, which disables preemption in
> function_graph_enter_regs, as Jiri and Yonghong suggested, there is no
> need to use migrate_disable. As a result, some overhead maybe will be
> reduced.
>
> Fixes: 0dcac2725406 ("bpf: Add multi kprobe link")
> Signed-off-by: Tao Chen <chen.dylane@...ux.dev>

Acked-by: Yonghong Song <yonghong.song@...ux.dev>