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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 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 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: EA17D100008 X-Stat-Signature: htiszhjpjateztcjj79ye87ikbbucpf5 X-Rspam-User: X-HE-Tag: 1770651025-843056 X-HE-Meta: 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 l/Gn/jKh sO/cNkBkoVjypMDxyE4c9ObkK5H6Ch7HedvgzA+/r+TOuoZ1l8iWE6wBT6b1LLcOdc3iM/tR6/ypBcWsLKmfQjbMELhZ8pijZ6K3EjPGBBuVwi6epzAJJWIHA7Uq2ca9LZgJVTfHyAgEpOs8KXwLpa2jeLNIS0gjCa5HO8w5PLs5B51CYCHu2wsDwzsGll+vpdK+T9LDJGXbK+p3eTdboeslXW6vbnsNuOAcAcsXPaB4MBfIPTDskN1s6CEdgxYGSdozjaexkUmwFk49OiKPOORnH9d3mjGybBKsZ4bKjtEGohCe+9Vern/iNmXG9RGi/O371N/spGaO97fd97NpKiL4KOIDZXnOP8vIMzDFhxFRGPO0x6joKXhUpY0+UdGTGtRxR6Jii74PhhGk2mPDeEkFXdwuagusdiAm3 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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