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[2003:d8:2f15:6200:d485:1bcd:d708:f5df]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-442f3979275sm26123595e9.34.2025.05.14.04.15.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 May 2025 04:15:46 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux.dev, David Hildenbrand , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Andrew Morton , Oscar Salvador , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , "Matthew Wilcox (Oracle)" Subject: [PATCH v1 0/2] mm/memory_hotplug: introduce and use PG_offline_skippable Date: Wed, 14 May 2025 13:15:42 +0200 Message-ID: <20250514111544.1012399-1-david@redhat.com> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Xc8ttt13Va7VQrFqSUNoyLKHvBMV2nIznTT2O9VSuog_1747221347 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: C51764000E X-Stat-Signature: ucbkeq346tjzkoh7dnebjbfi3sgdzcn5 X-HE-Tag: 1747221349-109179 X-HE-Meta: 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 mtrqR5t9 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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: This is a requirement for making PageOffline pages not have a refcount in the long future ("frozen"), and for reworking non-folio page migration in the near future. I have patches mostly ready to go to handle the latter. For turning all PageOffline() pages frozen, the non-folio page migration and memory ballooning drivers will have to be reworked first, to no longer rely on the refcount of PageOffline pages. Introduce PG_offline_skippable that only applies to PageOffline() pages -- of course, reusing one of the existing PG_ flags for now -- and convert virtio-mem to make use of the new way: to allow for skipping PageOffline pages during memory offlining, treating them as if they would not be allocated. Note that the existing mechanism relied on the driver (virtio-mem) dropping its reference during MEM_GOING_OFFLINE, which is complicated and not compatible with the concept of frozen pages (no refcount). Tested with virtio-mem on x86, including partially hotplugging a memory block (hotplugging 64MiB with a 128 MiB memory block size), and repeatedly onlining+offlining the memory block. Cc: David Hildenbrand Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: Xuan Zhuo Cc: "Eugenio Pérez" Cc: Andrew Morton Cc: Oscar Salvador Cc: Vlastimil Babka Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Brendan Jackman Cc: Johannes Weiner Cc: Zi Yan Cc: "Matthew Wilcox (Oracle)" David Hildenbrand (2): mm/memory_hotplug: PG_offline_skippable for offlining memory blocks with PageOffline pages mm/memory_hotplug: remove -EBUSY handling from scan_movable_pages() drivers/virtio/virtio_mem.c | 111 +----------------------------------- include/linux/page-flags.h | 29 +++++++--- mm/memory_hotplug.c | 22 ++----- mm/page_alloc.c | 8 +-- mm/page_isolation.c | 21 +++---- 5 files changed, 40 insertions(+), 151 deletions(-) base-commit: 2f6baf8dadecc2bec7d6bc931f7e0d58d8443d76 -- 2.49.0