From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 418632EB5CD for ; Mon, 9 Feb 2026 15:30:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770651025; cv=none; b=W3/tP28OmU66UG6mFz8+6i4/O2KeQOvCd3AwtwS0q40bjIspndcD6PtZ0+NDi5/61jgX2R+r0TxGeliPIjX4VNbrAlaFkQMfqp3BVdTGuWYkj9BBdcw9UtbVChuradeMf83e+U3PM3CgO1uGFogim/r+5DwNbdv+ut3R+N5NLBg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770651025; c=relaxed/simple; bh=Syo2nfb/vozha/nQ+Z68XrYJGV/g5qSp+feAbh52S5c=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=o8mFxUmdCDecRxDkjDM9fQ9uS22skA0G6Ba7+CFNkmMt/7RKqExV24AtA4l65g+mk/5Zr1kc8YTW05yBP/p1Ah2/mOzxtfbwwtGhgvmJqACRp/WeTMOSsezf28MMQv64utGuYACQfGmg7pDBWdgUMY5MhmRmNOeiO49H44hesIY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SqdHMa6Z; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SqdHMa6Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D09EC116C6; Mon, 9 Feb 2026 15:30:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770651024; bh=Syo2nfb/vozha/nQ+Z68XrYJGV/g5qSp+feAbh52S5c=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=SqdHMa6ZFYZMW0NCI/VHNQ+3jxq5oc3uR44Yls619P07hTcg6a1dhw/KkixDq0Sr5 e8mHUOXynARMvuuKER6zcpH3G3iynnCyThJJqbhqpDXgLOIJczmXHKEMaTxwAflX3p hAwUsI92FpOd1FRHqOMpClOAjBgRsk239HIn1ryBntwXfQ68Ergt5NamWFz3W3ScFC UO+ku5KRR1u2jzVe2UTSX6c+cGs60PZqJAn2Y/tsd6n3KFR8ISRA7snvtMz7xpSDJl oNYWjoGFvVC2NKBr76yhLHc+gvEHDI5+OYwY9lGL36ZA0RZrjNrEcU6YATFpByrTnG 2Vz7rH2ogi/Nw== Message-ID: <10f061c9-5c9a-4e8a-8790-a2a68b38ff33@kernel.org> Date: Mon, 9 Feb 2026 16:30:15 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 4/5] arm64: mm: implement the architecture-specific clear_flush_young_ptes() To: Baolin Wang , akpm@linux-foundation.org, catalin.marinas@arm.com, will@kernel.org Cc: lorenzo.stoakes@oracle.com, ryan.roberts@arm.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, riel@surriel.com, harry.yoo@oracle.com, jannh@google.com, willy@infradead.org, baohua@kernel.org, dev.jain@arm.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/9/26 15:07, Baolin Wang wrote: > Implement the Arm64 architecture-specific clear_flush_young_ptes() to enable > batched checking of young flags and TLB flushing, improving performance during > large folio reclamation. > > Performance testing: > Allocate 10G clean file-backed folios by mmap() in a memory cgroup, and try to > reclaim 8G file-backed folios via the memory.reclaim interface. I can observe > 33% performance improvement on my Arm64 32-core server (and 10%+ improvement > on my X86 machine). Meanwhile, the hotspot folio_check_references() dropped > from approximately 35% to around 5%. > > W/o patchset: > real 0m1.518s > user 0m0.000s > sys 0m1.518s > > W/ patchset: > real 0m1.018s > user 0m0.000s > sys 0m1.018s > > Reviewed-by: Ryan Roberts > Signed-off-by: Baolin Wang > --- > arch/arm64/include/asm/pgtable.h | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 3dabf5ea17fa..a17eb8a76788 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -1838,6 +1838,17 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, > return contpte_clear_flush_young_ptes(vma, addr, ptep, 1); > } > > +#define clear_flush_young_ptes clear_flush_young_ptes > +static inline int clear_flush_young_ptes(struct vm_area_struct *vma, > + unsigned long addr, pte_t *ptep, > + unsigned int nr) > +{ > + if (likely(nr == 1 && !pte_cont(__ptep_get(ptep)))) I guess similar cases where we should never end up with non-present ptes should be updated accordingly. ptep_test_and_clear_young(), for example, should never be called on non-present ptes. Reviewed-by: David Hildenbrand (Arm) -- Cheers, David