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Fri, 26 Sep 2025 02:34:32 -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 Cc: bpf@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Yafang Shao Subject: [PATCH v8 mm-new 05/12] mm: thp: decouple THP allocation between swap and page fault paths Date: Fri, 26 Sep 2025 17:33:36 +0800 Message-Id: <20250926093343.1000-6-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20250926093343.1000-1-laoar.shao@gmail.com> References: <20250926093343.1000-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 91F131A0004 X-Stat-Signature: fzacah4ptmj61x97ah7mhj84iweoq1md X-Rspam-User: X-HE-Tag: 1758879274-923876 X-HE-Meta: U2FsdGVkX1/s/nex86ryqaczHMIejhiAhPvIf2i5EJR4pFBIUmJNINft6NB4oIrLj0HoCgJdUDW3xtS0/+Qd4Orv/ktDh7ZUOjVGkJ8lSqM/zhAdCTHfcRLYeZt47Zw6hZuVcv9fZIFRqwwVcuRYJeQM+9vRxyQLpnUawhr0vp277C9czCWbfuoXk9dXoa3ztrQqV5uAxVy0/jKPWO1pDpAlDrMYuOEzlEND3wHvG9AZ03cmwZyMVydHG7SyITwNmCB17KpT5z2ucNSfTs7ZQUmH+dybmgTbwo+lJFPVM63Rw+RTzDU9PL/oQ9N2G5K1OgDVOsy6JsbLKkPUNh6SHB7T8z3og/TWL5TsjY52g2iz3PvfwaGLjiNvwbw1QYH6VEPA8HuidS5fZTjT4ilzqMNfOFnZAKaDFafW/ugkY0RYlUW0clXaGjqyTyjviMrWfJifK+hJa29jUYB3EBPDnWPIHIITH9QdKDZ7dbwbiL/bAgfB60Y44chhhJU4dJ+h3/CV6xvLHin5bgU7MjmGj+hwVYIJ+e33KEYjPl9SBV2yhVZf7QqUsuznXhEzMPcUIGcXDVR0Eg/LS//M2vn9o7wqbPNcXzqQzXvuaA3XaHlMuZPfdyBkJaEsVOvpcKXT8Si4sA6DlB6gQe3/O7+jpsF2KXwJSPZj1+uDDHUOSArwdzIjrScFaToyTY2wyF+vAHgK2Q6cXEvOW+u5VQ9rtQl7PQ33orAbZ3FCnJmDNoYDGBsFMO30TvPdTUgb3piU8fbnik5pf7o/U/VhvxGYGZt52o9QIrNvBn367iEN1nS5kkEejnmwRVQBC7Ihugw7vLc8VaBCjB+OyXxHeZSTqyExh/tuqeTWvfVhT1VCvjceUjcrQRoDbVfYQoVboQhalroX8LUJKOX6FtvIaB2GIN6oI9rA7og/dxDCaDaMS4wHx9ug5/PyhQIVegB4nOFVCD1B5mXBAgJY9uLuWB9 p3Ep311Y ZTYPyXucUjeOUPqKKd1wW2A+xuLVEPzMs7dgkR/HgWWFhnKYamgiZzmACqZ4fSf4apFZwE/tPJzf3zTxCpNUD0cEzUfW7wX2B2L4gk/Tte+OVxUsGhFQ/HfXFoZkd76FKyhuaOl0EXmANecR6qDT+GX1iKnudtlGUaOdZ+qVzG5b5DuCl+Hw6rQrXysHNUidYOoMChNTi+YIf5RMJFmltwvDIIyNg+G29p+wWSSwMolascxB7M8nr/Fhs9O3Pbbe2YToIe2oeIbWh+om0Z5F1SC1fI7rau6EDT4u1VCdpXKu/mylHfBgF+53350HGJhdoP9CprMvWipbmNYMyuh0iTFj0TAw9Nrx0j8vqpNC+heUAYQDly2rJkSXxq5Owfvez5reNNSo+TOycb6qhnn+PiRBSJd+E4qSzCiT2pQsOazaCC5QogUXBMCw/CZW9p5FRK5d1iegUJXX16X2EgVKwyMtq0ZJ4AOlxyYX9SzgFNJOm2+vAJjyq1FiHWSW34PCVnFdlHvmiyZg5k305eAiocLX6yItjLltrMKRrmZP06RodGQ2TZy1asN4sIcwYfzAYqTqTXbQdVyR/G3dZY9NH4d5LUlfBRbGVjeOoLgr+q4NY/pQ5Dez8r6oAyw== 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 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 fea94c059bed..bd30694f6a9c 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