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Sun, 26 Oct 2025 03:02:53 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, david@redhat.com, lorenzo.stoakes@oracle.com Cc: martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, ziy@nvidia.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, hannes@cmpxchg.org, usamaarif642@gmail.com, gutierrez.asier@huawei-partners.com, willy@infradead.org, ameryhung@gmail.com, rientjes@google.com, corbet@lwn.net, 21cnbao@gmail.com, shakeel.butt@linux.dev, tj@kernel.org, lance.yang@linux.dev, rdunlap@infradead.org, clm@meta.com, bpf@vger.kernel.org, linux-mm@kvack.org, Yafang Shao Subject: [PATCH v12 mm-new 04/10] mm: thp: decouple THP allocation between swap and page fault paths Date: Sun, 26 Oct 2025 18:01:53 +0800 Message-Id: <20251026100159.6103-5-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20251026100159.6103-1-laoar.shao@gmail.com> References: <20251026100159.6103-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: fhk5m5sui6deh7jy3xiyqxtxn1atznxu X-Rspamd-Queue-Id: 95EA1180010 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1761472975-738981 X-HE-Meta: U2FsdGVkX1/oLWNDpiI6cSDrOY0aEEAI1Q+gMZ5AEwzNnw0PVVh0v0j1lgotxPaxwEkOyD8fqhUY7oOnM2JYTBjCBkZh4XKE/yhXNf/iHBGad37fQLYkwYUzcqgEMDa5MxXf7aSsE/D1cOroS6WSmgatTf+RoZwDRDlaFqyY5c/jdMzizVMHzDn87spvSNAgaCk2hfmMYDwMbzcDIIIEUWtiQXShe+QMSrwa7iULTwR5Vc3rYfY2bvs4pm2Z6Bzm/VflUi6XVED3gzaGMUih8tTpMDX4r2f+51oI4RtvL0afT/1ZUbxPMrbYcIBcSbwtu8Yk4wa7y06YgHHeKlnSno8hBX9F/gQuRBjDChpE2Sl+miuZzJlKdZVDnEloWs6n6ckDweHrwIdMgcWoRNLExAF6HErN7Hy6/9F1wHKHAPUkslYVeKw+Mlap4UDTP0C2WNgREAU+YgRve/QHyaCjNFmMAhPHYHXUBTvz3M0HrazSj9EHepdg7jhNcFw2F7pDbMOSwOI3T2Gj2oUfdms/GoUCyIcO0QvVzLPUtoNXhq77XT8JkIRQdpnzNPzVLoHUZGivkU2rw03gI8QKdYmQkQMGohLE6XOm+n9kjKCKNQ56jLffslYyuRa2ZowIvbNdRRDvQSitXpMe87CC3QW2/M3XbLtQpt0fHv74FftOA8mknxe9X2T3ZyVgOTQ0lS5qADRmtJv0RVTzDTzyWVONVpxYrEclhCSgfkgMnW9IpHiPp8I+Nu7jvGnUVeC57jcCcK9TRkiOk7a9IKB3DCP6y+/Bfr78VVmXS9ZJiJZ2dJG3qRInYer5vboQPQOhc6rxB1x+iOb5TATQT7RHavjxD2OGs/7D3hlcug5VPoUfQwwRDSNklyvPbobEwurQvyHLe0vVKTLnF7j6zjNyZVlvFYDsYnlk0Tepi/BQfeHZdDPVobhDrj7HHr/UV1Yae4jYJzedozIH7qkU4VjMC2b IWuJvpeG 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 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: The new BPF capability enables finer-grained THP policy decisions by introducing separate handling for swap faults versus normal page faults. As highlighted by Barry: We’ve observed that swapping in large folios can lead to more swap thrashing for some workloads- e.g. kernel build. Consequently, some workloads might prefer swapping in smaller folios than those allocated by alloc_anon_folio(). While prtcl() could potentially be extended to leverage this new policy, doing so would require modifications to the uAPI. Signed-off-by: Yafang Shao Reviewed-by: Lorenzo Stoakes Acked-by: Usama Arif Cc: Barry Song <21cnbao@gmail.com> --- include/linux/huge_mm.h | 3 ++- mm/huge_memory.c | 2 +- mm/memory.c | 2 +- 3 files changed, 4 insertions(+), 3 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 49050455f793..7867411b2a21 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -96,9 +96,10 @@ extern struct kobj_attribute thpsize_shmem_enabled_attr; enum tva_type { TVA_SMAPS, /* Exposing "THPeligible:" in smaps. */ - TVA_PAGEFAULT, /* Serving a page fault. */ + TVA_PAGEFAULT, /* Serving a non-swap page fault. */ TVA_KHUGEPAGED, /* Khugepaged collapse. */ TVA_FORCED_COLLAPSE, /* Forced collapse (e.g. MADV_COLLAPSE). */ + TVA_SWAP_PAGEFAULT, /* serving a swap page fault. */ }; #define thp_vma_allowable_order(vma, type, order) \ diff --git a/mm/huge_memory.c b/mm/huge_memory.c index db9a2a24d58c..0bfbb672a559 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -102,7 +102,7 @@ unsigned long __thp_vma_allowable_orders(struct vm_area_struct *vma, unsigned long orders) { const bool smaps = type == TVA_SMAPS; - const bool in_pf = type == TVA_PAGEFAULT; + const bool in_pf = (type == TVA_PAGEFAULT || type == TVA_SWAP_PAGEFAULT); const bool forced_collapse = type == TVA_FORCED_COLLAPSE; unsigned long supported_orders; vm_flags_t vm_flags = vma->vm_flags; diff --git a/mm/memory.c b/mm/memory.c index 7b52068372d8..c6a766b271ef 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4558,7 +4558,7 @@ static struct folio *alloc_swap_folio(struct vm_fault *vmf) * Get a list of all the (large) orders below PMD_ORDER that are enabled * and suitable for swapping THP. */ - orders = thp_vma_allowable_orders(vma, TVA_PAGEFAULT, + orders = thp_vma_allowable_orders(vma, TVA_SWAP_PAGEFAULT, BIT(PMD_ORDER) - 1); orders = thp_vma_suitable_orders(vma, vmf->address, orders); orders = thp_swap_suitable_orders(swp_offset(entry), -- 2.47.3