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Fri, 19 Dec 2025 14:03:09 +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 v3 5/5] mm: rmap: support batched unmapping for file large folios Date: Fri, 19 Dec 2025 14:02:55 +0800 Message-ID: X-Mailer: git-send-email 2.43.7 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 44DABC0010 X-Rspamd-Server: rspam10 X-Stat-Signature: 7sarq8q9gw61gco7g8utarbpobe67ak4 X-HE-Tag: 1766124192-972906 X-HE-Meta: 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 GkcdyiV/ XiXo3qEBwi/8vj7+vSEhE8FzDGjJJGCyHCEjG2iu/vPVld0RasxA8NVacBWskOQV3z2dmowIopIcapH+iZclrH2DfmPedld4cTGISD6184hJrQlGKV7CGqJwkETljnPGsFPZJdP5RsWtQ+hUd1l64m8N1rtrofb7y8NH/I6Eb12cEYGye/z+ozqS+jpBak2GLkAAxZ6xfNdtQHeqTAz5EbVGN1Zdv3x+e8gdj+g6CKVwXEziCGEIxqmnwcwVOyG0wo3qCelrBpSsx6cmmfP3h4OzWFaQ2Pno8MtudrtgP4WUnpQk= 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 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 a0fc05f5966f..7482121d4e92 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1862,9 +1862,10 @@ 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; @@ -2230,7 +2231,7 @@ 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