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b=seVIAz06FJ4S6JCLyie8xRn+U8cb0dC+kvxkBKZDdPdmuqerI9dlxrz9Fc73Lv9Iy ypwt9GfXGNmyLwO9XLvJvY6Yn6UM097mtI9XnJr70d0JWSHAuzqpePRqx8KvUonc4Z y9D6agHrhE0R4idt7VcL/E1JrZRuYb/shzlXsIK2IS+YGWaAE8FGU7gy5b9Jlu3ViD aFTIJ6m0Irb9C1p2tJrQNQsOkbOHr3EoXKjYX+koGcUcQlWcSWs6WYgDav03DyVZqD GZWjEY3lDVkOoBihyTt9zn3KfA51m4LczeE0W4M8YAMgZzU04Wzavb0jMoj6lBzwkW 7TviaigilWwlw== Message-ID: <81cc2fb0-f6a6-45af-9463-c5138f742455@kernel.org> Date: Mon, 9 Feb 2026 16:25:35 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 1/5] mm: rmap: support batched checks of the references for large folios 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: <12132694536834262062d1fb304f8f8a064b6750.1770645603.git.baolin.wang@linux.alibaba.com> 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-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 618684000B X-Stat-Signature: 38gotig67k8hd6yyf5ddetc75jyfegow X-HE-Tag: 1770650746-507172 X-HE-Meta: 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 yx0/b+hx TTdulZ7X1fepb1Cstavp3N1rv0dAUaznhsaioaB3dcCkPqRhlJRqhJsOBJ0IPz03dxVXd1zHsJT3U24VJ2E53zMDGB4VIsfSesMB8zK3LN6eGcWOuD9BypLJyjm3dPssHp7oQZfIiYU9R3+kNuKEZCLZZjBO03cPOUelVk00kqlyqMqDGlzRiVeZD5MBZUL8zauVcfSNEdmLfZG7/i0mdIxizNLGZmOfK7vIKaVDEU3tsJtOYhBK3+d3WLXIl0RJA1O27JAuwwiJMqkiJ7/Z+/KiUZG/mCC+Q5+ESddzs7NFb7JGx95LPvVhXR5auPHEtHiAAzgCOiKeGAQWGt+zahQEToBhcL/yGzMxBwFjEri5NjDjb+RBoALM2kLIsRdDFC0lg 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: > Currently, folio_referenced_one() always checks the young flag for each PTE > sequentially, which is inefficient for large folios. This inefficiency is > especially noticeable when reclaiming clean file-backed large folios, where > folio_referenced() is observed as a significant performance hotspot. > > Moreover, on Arm64 architecture, which supports contiguous PTEs, there is already > an optimization to clear the young flags for PTEs within a contiguous range. > However, this is not sufficient. We can extend this to perform batched operations > for the entire large folio (which might exceed the contiguous range: CONT_PTE_SIZE). > > Introduce a new API: clear_flush_young_ptes() to facilitate batched checking > of the young flags and flushing TLB entries, thereby improving performance > during large folio reclamation. And it will be overridden by the architecture > that implements a more efficient batch operation in the following patches. > > While we are at it, rename ptep_clear_flush_young_notify() to > clear_flush_young_ptes_notify() to indicate that this is a batch operation. > > Reviewed-by: Harry Yoo > Reviewed-by: Ryan Roberts > Signed-off-by: Baolin Wang > --- Thanks! Acked-by: David Hildenbrand (Arm) -- Cheers, David