linux-kernel - Re: [PATCH v5] kasan: speed up mte_set_mem_tag

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Message-Id: <162196691854.2317985.15060469643983512129.b4-ty@kernel.org>
Date:   Tue, 25 May 2021 19:58:47 +0100
From:   Will Deacon <will@...nel.org>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Steven Price <steven.price@....com>,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        kasan-dev@...glegroups.com
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v5] kasan: speed up mte_set_mem_tag_range

On Thu, 20 May 2021 18:00:23 -0700, Evgenii Stepanov wrote:
> Use DC GVA / DC GZVA to speed up KASan memory tagging in HW tags mode.
> 
> The first cacheline is always tagged using STG/STZG even if the address is
> cacheline-aligned, as benchmarks show it is faster than a conditional
> branch.

Applied to arm64 (for-next/mte), thanks!

[1/1] kasan: speed up mte_set_mem_tag_range
      https://git.kernel.org/arm64/c/3d0cca0b02ac

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev