linux-kernel - Re: [PATCH v2] arm64: Allow CONFIG_AUTOFDO

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Message-ID: <202411200958.F8A656A080@keescook>
Date: Wed, 20 Nov 2024 09:59:11 -0800
From: Kees Cook <kees@...nel.org>
To: Yabin Cui <yabinc@...gle.com>
Cc: Rong Xu <xur@...gle.com>, Han Shen <shenhan@...gle.com>,
	Jonathan Corbet <corbet@....net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	workflows@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] arm64: Allow CONFIG_AUTOFDO_CLANG to be selected

On Mon, Nov 18, 2024 at 02:25:40PM -0800, Yabin Cui wrote:
> Select ARCH_SUPPORTS_AUTOFDO_CLANG to allow AUTOFDO_CLANG to be
> selected.
> 
> On ARM64, ETM traces can be recorded and converted to AutoFDO profiles.
> Experiments on Android show 4% improvement in cold app startup time
> and 13% improvement in binder benchmarks.
> 
> Signed-off-by: Yabin Cui <yabinc@...gle.com>

This looks trivial enough to enable. ;) I expect this could go via the
kbuild tree (Masahiro) with an arm64 maintainer Ack.

FWIW:

Reviewed-by: Kees Cook <kees@...nel.org>

-- 
Kees Cook