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Fri, 26 Dec 2025 14:08:13 +0800 From: Baolin Wang To: akpm@linux-foundation.org, david@kernel.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, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 5/5] mm: rmap: support batched unmapping for file large folios Date: Fri, 26 Dec 2025 14:07:59 +0800 Message-ID: <142919ac14d3cf70cba370808d85debe089df7b4.1766631066.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 829D880007 X-Stat-Signature: 354jojnxcz7i9kghxma9pkw6he68d6o4 X-Rspam-User: X-HE-Tag: 1766729297-159595 X-HE-Meta: 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 MQegLrxE oE9Y2pd1gaLR0OL3rkxfArI8DEVwJtXcdB2hsLbroO2d7qSbR6xe2RoEL8rAHr10mcXaYbqixr2FWWTgez90WjoOXkUaWfAXZKw+tkTeQQmuIXwi1ssQgKsuZk4dPnFtFL/WjlSsQOicTKhozoQqAY6tRoQ5ZrKYjUD6JLIv3HHP6it7D42YTOpi8jcP+sL6fRP+JD2Hledzw4RQ7udhqsB5yBVpAVUaLXkg8zry84yB9YVT1Os0e+A7I+MnnsyfOtsxn82pmotd0e8n1eZeGSviYMiDQ4VtdivwUVVaTGekyeIfji98DPn0lyma001LXPQZ+WFJqSZRs8KDZm6EJklDLrtJhFMfI/XGwYXRnuZICgpw= 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: Similar to folio_referenced_one(), we can apply batched unmapping for file large folios to optimize the performance of file folios reclamation. Barry previously implemented batched unmapping for lazyfree anonymous large folios[1] and did not further optimize anonymous large folios or file-backed large folios at that stage. As for file-backed large folios, the batched unmapping support is relatively straightforward, as we only need to clear the consecutive (present) PTE entries for file-backed large folios. 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 75% performance improvement on my Arm64 32-core server (and 50%+ improvement on my X86 machine) with this patch. W/o patch: real 0m1.018s user 0m0.000s sys 0m1.018s W/ patch: real 0m0.249s user 0m0.000s sys 0m0.249s [1] https://lore.kernel.org/all/20250214093015.51024-4-21cnbao@gmail.com/T/#u Reviewed-by: Ryan Roberts Acked-by: Barry Song Signed-off-by: Baolin Wang --- mm/rmap.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index 985ab0b085ba..e1d16003c514 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1863,9 +1863,10 @@ static inline unsigned int folio_unmap_pte_batch(struct folio *folio, end_addr = pmd_addr_end(addr, vma->vm_end); max_nr = (end_addr - addr) >> PAGE_SHIFT; - /* We only support lazyfree batching for now ... */ - if (!folio_test_anon(folio) || folio_test_swapbacked(folio)) + /* We only support lazyfree or file folios batching for now ... */ + if (folio_test_anon(folio) && folio_test_swapbacked(folio)) return 1; + if (pte_unused(pte)) return 1; @@ -2231,7 +2232,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, * * See Documentation/mm/mmu_notifier.rst */ - dec_mm_counter(mm, mm_counter_file(folio)); + add_mm_counter(mm, mm_counter_file(folio), -nr_pages); } discard: if (unlikely(folio_test_hugetlb(folio))) { -- 2.47.3