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From:   Will Deacon <will@kernel.org>
To:     linux-arm-kernel@lists.infradead.org,
        Barry Song <21cnbao@gmail.com>, akpm@linux-foundation.org,
        catalin.marinas@arm.com, linux-mm@kvack.org, steven.price@arm.com,
        anshuman.khandual@arm.com
Cc:     kernel-team@android.com, Will Deacon <will@kernel.org>,
        guojian@oppo.com, ying.huang@intel.com, hughd@google.com,
        hanchuanhua@oppo.com, v-songbaohua@oppo.com, hannes@cmpxchg.org,
        minchan@kernel.org, zhangshiming@oppo.com,
        linux-kernel@vger.kernel.org, aarcange@redhat.com,
        shy828301@gmail.com
Subject: Re: [PATCH v4] arm64: enable THP_SWAP for arm64
Date:   Wed, 20 Jul 2022 11:15:09 +0100
Message-Id: <165831076076.3414765.4205578904635194044.b4-ty@kernel.org>
In-Reply-To: <20220720093737.133375-1-21cnbao@gmail.com>
References: <20220720093737.133375-1-21cnbao@gmail.com>
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On Wed, 20 Jul 2022 21:37:37 +1200, Barry Song wrote:
> From: Barry Song <v-songbaohua@oppo.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