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Mon, 29 Sep 2025 22:59:25 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org, david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.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, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.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 Cc: bpf@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Yafang Shao Subject: [PATCH v9 mm-new 04/11] mm: thp: decouple THP allocation between swap and page fault paths Date: Tue, 30 Sep 2025 13:58:19 +0800 Message-Id: <20250930055826.9810-5-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20250930055826.9810-1-laoar.shao@gmail.com> References: <20250930055826.9810-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 557741C000A X-Stat-Signature: ytgzx3tytmdef3u9wt4z454bb5bwojxo X-HE-Tag: 1759211967-42960 X-HE-Meta: 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 DktTBMZB 3oTltdfw+NZIOkio/KWw3T2BD0qqG3EYxwGLHhU928BY9GvS/n4VS74NCzPVZEpX2aqZr4NMGw7GxLKtVR43vnwEg4IVlRr2AAS3MC5VK/NeC9VLHxoSFQMi6KDjR30hVfSCVebAtQpo5Npp6KPMxrezscCp8QNHlEDNd 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 02055cc93bfe..9b9dfe646daa 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -97,9 +97,10 @@ 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 1ac476fe6dc5..08372dfcb41a 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 cd04e4894725..58ea0f93f79e 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