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Wed, 26 Nov 2025 17:15:47 -0800 (PST) Received: from Barrys-MBP.hub ([47.72.129.29]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7c414c226f9sm22447356b3a.53.2025.11.26.17.15.27 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 26 Nov 2025 17:15:46 -0800 (PST) From: Barry Song <21cnbao@gmail.com> To: akpm@linux-foundation.org, linux-mm@kvack.org Cc: Barry Song , David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , Matthew Wilcox , Pedro Falcato , Jarkko Sakkinen , Oscar Salvador , Kuninori Morimoto , Oven Liyang , Mark Rutland , Ada Couprie Diaz , Robin Murphy , =?UTF-8?q?Kristina=20Mart=C5=A1enko?= , Kevin Brodsky , Yeoreum Yun , Wentao Guan , Thorsten Blum , Steven Rostedt , Yunhui Cui , Nam Cao , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH 2/2] mm/swapin: Retry swapin by VMA lock if the lock was released for I/O Date: Thu, 27 Nov 2025 09:14:38 +0800 Message-Id: <20251127011438.6918-3-21cnbao@gmail.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20251127011438.6918-1-21cnbao@gmail.com> References: <20251127011438.6918-1-21cnbao@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: DEDEB180019 X-Rspamd-Server: rspam02 X-Stat-Signature: 4xng3dnzawry1pzwnzi753h6emh4ho9f X-Rspam-User: X-HE-Tag: 1764206148-339967 X-HE-Meta: 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 5pn4bBuw 4qkKRz9VVzQhRhazw4GzaypIaaIsPfczy2nAth5OBjd8L1SCblc9tSrgGdekqo2sqNMg7rpbkG+HpwvifetTZCbtrpU/LlW2P2lZh16eBg3bxyOSMXP+xP5H6QDBqTUUYNVEEFJE7VOqJ/ictHBQavj4G2dlaV+vuphPVFun4jFiJuBSjgbqYRDmw/KU1rfJdSjAQdSJDmeExRL4ayt/yDMNod3QJUX5X/OY74/4b5W+VzjX24xiEK0YCXdJfzMBVTpQr9hJnBX/Xz+Un4NE9eS7+zz0FJd0HSu5XXcL31HZWOkJxrLoEFUpfILYtGk+3utaR/8Jt7iJUTyC5S0qfAFw1eiuxUBuwv4Nw14UXv/Ykwalh6OpewV86gi0X5wAwvna2n4pjAdax8UAqkym1u61ecU49mZWr+YOsMsGrzImYvasHDmhNQ5S6V1wennVX3ZLsbyFiyzbya4AZzBxlSydrY5gTcswo4Y9CtmUX3J34VJjKJdvUXx723gxSsa+wWNLUIFYG3pY3v8XKXTyeZNNbyV7RM+YYRXCOCg//aX54PTF/utAUvRNIthkYH5YbvNvWRjlvMzoaB4yguGNqGzIg1NGiu73cwxiK1LM0FJYhcMB9wfIg0/FWS9KSJLjG+RWJCLm4VXLyqHvYfUjmOnqdM6inBo+3vkCYFg4fwI6rRGbrgARfA4jDaeSUNQzdFoPXbLyXn04rq0CSXmdvj7AGM15orBbp1JdgzGQreftgyCqoWm38WO665Mr+V9oX8b8tp+RMLurGPxz4S+BkPrcJ1PlXc3h1Iy4inNpOOZbhyWrOOA1z+ukkAVEkKsVbl6uVbXo6XQm4xAX76pdSajDDpRtsExDj41dHCusxIXXxe4CtlI5CKm6LtPk2z1W/leTVxkMIOJQH2jK31CCww1JmurH2utGK++bIHXUYAtWSDI9pueRrgVs07akE8dVTZllzUPuFdbWstzCLzqiIS+RQS94X 7OVqUus3 pa7tUIGx+qsvJKuX+dw+82+jJPxAc8tv6jaY4Ds8yiI10b3zUb/Qz0D+mHj+uLREfPCLPZiRqIQJKH2Qd1BzxpN+BvLU+tCn79/lC4/q6j0hzDqhNnj9FZ0JFJImWb7cGf40ebS5H2JPc+EmggnQvKB2SrEHdSy69EZDsqH60yA8P8abPRaBs9oy7grJqP1eSRhEtgBzn6WP7e2t16PcfMiMz3/7ibMVq1SmsBSxQdB6PVhHU/9UB81JQJa5H+v5T5XyHYy70FZszWBb3JWWeGJhKmGVEYKXcOZWINI8Vy5u+PIYD90OoQ== 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: From: Barry Song If the current do_swap_page() took the per-VMA lock and we dropped it only to wait for I/O completion (e.g., use folio_wait_locked()), then when do_swap_page() is retried after the I/O completes, it should still qualify for the per-VMA-lock path. Cc: David Hildenbrand Cc: Lorenzo Stoakes Cc: Liam R. Howlett Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Alexandre Ghiti Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Huacai Chen Cc: WANG Xuerui Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Alexander Gordeev Cc: Gerald Schaefer Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: x86@kernel.org Cc: H. Peter Anvin Cc: Matthew Wilcox Cc: Pedro Falcato Cc: Jarkko Sakkinen Cc: Oscar Salvador Cc: Kuninori Morimoto Cc: Oven Liyang Cc: Mark Rutland Cc: Ada Couprie Diaz Cc: Robin Murphy Cc: Kristina Martšenko Cc: Kevin Brodsky Cc: Yeoreum Yun Cc: Wentao Guan Cc: Thorsten Blum Cc: Steven Rostedt Cc: Yunhui Cui Cc: Nam Cao Cc: Chris Li Cc: Kairui Song Cc: Kemeng Shi Cc: Nhat Pham Cc: Baoquan He Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: loongarch@lists.linux.dev Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-riscv@lists.infradead.org Cc: linux-s390@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Barry Song --- mm/memory.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 4f933fedd33e..7f70f0324dcf 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4654,6 +4654,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) unsigned long page_idx; unsigned long address; pte_t *ptep; + bool retry_by_vma_lock = false; if (!pte_unmap_same(vmf)) goto out; @@ -4758,8 +4759,13 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) swapcache = folio; ret |= folio_lock_or_retry(folio, vmf); - if (ret & VM_FAULT_RETRY) + if (ret & VM_FAULT_RETRY) { + if (fault_flag_allow_retry_first(vmf->flags) && + !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT) && + (vmf->flags & FAULT_FLAG_VMA_LOCK)) + retry_by_vma_lock = true; goto out_release; + } page = folio_file_page(folio, swp_offset(entry)); /* @@ -5044,7 +5050,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) } if (si) put_swap_device(si); - return ret; + return ret | (retry_by_vma_lock ? 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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , Matthew Wilcox , Pedro Falcato , Jarkko Sakkinen , Oscar Salvador , Kuninori Morimoto , Oven Liyang , Mark Rutland , Ada Couprie Diaz , Robin Murphy , =?UTF-8?q?Kristina=20Mart=C5=A1enko?= , Kevin Brodsky , Yeoreum Yun , Wentao Guan , Thorsten Blum , Steven Rostedt , Yunhui Cui , Nam Cao , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH 2/2] mm/swapin: Retry swapin by VMA lock if the lock was released for I/O Date: Thu, 27 Nov 2025 09:14:38 +0800 Message-Id: <20251127011438.6918-3-21cnbao@gmail.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20251127011438.6918-1-21cnbao@gmail.com> References: <20251127011438.6918-1-21cnbao@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 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