linux-kernel - Re: [PATCH v4] arm64: enable THP

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Date:   Wed, 20 Jul 2022 11:15:09 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org,
        Barry Song <21cnbao@...il.com>, akpm@...ux-foundation.org,
        catalin.marinas@....com, linux-mm@...ck.org, steven.price@....com,
        anshuman.khandual@....com
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        guojian@...o.com, ying.huang@...el.com, hughd@...gle.com,
        hanchuanhua@...o.com, v-songbaohua@...o.com, hannes@...xchg.org,
        minchan@...nel.org, zhangshiming@...o.com,
        linux-kernel@...r.kernel.org, aarcange@...hat.com,
        shy828301@...il.com
Subject: Re: [PATCH v4] arm64: enable THP_SWAP for arm64

On Wed, 20 Jul 2022 21:37:37 +1200, Barry Song wrote:
> From: Barry Song <v-songbaohua@...o.com>
> 
> THP_SWAP has been proven to improve the swap throughput significantly
> on x86_64 according to commit bd4c82c22c367e ("mm, THP, swap: delay
> splitting THP after swapped out").
> As long as arm64 uses 4K page size, it is quite similar with x86_64
> by having 2MB PMD THP. THP_SWAP is architecture-independent, thus,
> enabling it on arm64 will benefit arm64 as well.
> A corner case is that MTE has an assumption that only base pages
> can be swapped. We won't enable THP_SWAP for ARM64 hardware with
> MTE support until MTE is reworked to coexist with THP_SWAP.
> 
> [...]

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

[1/1] arm64: enable THP_SWAP for arm64
      https://git.kernel.org/arm64/c/d0637c505f8a

Cheers,
-- 
Will

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