linux-kernel - Re: [PATCH v2] arm64: Disable branch profiling for all arm64 code

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Message-ID: <20260107111029.28e0c52b@gandalf.local.home>
Date: Wed, 7 Jan 2026 11:10:29 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Mark Rutland <mark.rutland@....com>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Laura Abbott
 <labbott@...hat.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Masami
 Hiramatsu <mhiramat@...nel.org>, kernel-team@...a.com, puranjay@...nel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH v2] arm64: Disable branch profiling for all arm64 code

On Wed, 7 Jan 2026 01:37:36 -0800
Breno Leitao <leitao@...ian.org> wrote:

> I am starting to look and remove some of these likely/unlikely hint that
> are 100% wrong on some very sane configuration (arm64 baremetal hosts
> running a webserver).
> 
> So far, these are the fixes I have in flight now.
> 
>  * https://lore.kernel.org/all/20260105-dcache-v1-1-f0d904b4a7c2@debian.org/
>  * https://lore.kernel.org/all/20260106-blk_unlikely-v1-1-90fb556a6776@debian.org/
>  * https://lore.kernel.org/all/20260105-annotated_idle-v1-1-10ddf0771b58@debian.org/

Nice. Thanks for letting me know. I'm happy to see that someone besides me
is using the annotated branch profiler to fix real issues in the kernel.

I would love it if more people did the same. Anyway, please advertise this
as much as possible. If it shows that it is helping to fix real bugs, maybe
it would attract the interest of more developers, and more importantly, it
keeps the tooling in place. I'm constantly fighting to keep it from being
removed from the kernel :-p

-- Steve