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Howlett" , Andrew Morton , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Randy Dunlap , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.1 0/5] mm/damon: introduce pgidle_set probe filter type Date: Wed, 9 Sep 2026 21:09:02 -0700 Message-ID: <20260910040911.148273-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 3A91BC0005 X-Rspam-User: X-Stat-Signature: pemeqtnmqnnnzui6ydthz8xzmqb3b74y X-HE-Tag: 1789013365-979566 X-HE-Meta: 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 sEek/Hmq s5b0IXDBfQGbEyxppHk1AgplCtPanViIUYTyPa999vFEed5M4XynFeDHq8wfdyupTcR4XrYUVGJ3NGP1/VIek/4KUE2ukJFrFtY0kQBl7+OofvvI2czzBZX3lnJEuxVklgW7OPpcDFO94MGiuPUdrMJhpUoYdr6a+10qVNqv6XdvI4ogyxfcZXbaJcphLgxheZbgnQOSlssgmWpKQrs4fuofbAMA2Gd3Y6MgRRI9uMV0ywcG0T0ogHfngItUVOOeCXQqMdfc0TG4Dbht5FnzFIa0dQFzUflwKcKoQ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Users can do effective access monitoring with DAMON, using set_pgidle probe prep operation and pgidle_unset allowing probe filter. In the setup, high probe_hits means the region was accessed frequently. Zero probe_hits means the region was not accessed. The filter, however, matches only the memory that can show the idleness. Regions of zero probe_hits may contain memory that was just unable to show the idleness. On virtual address space based monitoring, for example, non-present pages are reported as cold. It is truly cold, but if the purpose is to make some operations like reclaiming or compressing the data, this is not really useful. Introduce a new probe filter type, pgidle_set, that confirms the page is marked as idle. Using it instead of pgidle_unset, users can find cold pages that can effectively be processed. Patch 1 introduces the pgidle_set probe filter type to DAMON kernel API. Patches 2 and 3 add support for it on physical and virtual address space operation sets, respectively. Patch 4 adds support for it on the DAMON sysfs interface. Finally, patch 5 updates the documentation for the new filter type. Changes from RFC - RFC: https://lore.kernel.org/20260906175009.93471-1-sj@kernel.org - Rebase to latest mm-new. SJ Park (5): mm/damon/api: introduce DAMON_FILTER_TYPE_PGIDLE_SET mm/damon/paddr: support DAMON_FILTER_TYPE_PGIDLE_SET mm/damon/vaddr: support DAMON_FILTER_TYPE_PGIDLE_SET mm/damon/sysfs: support DAMON_FILTER_TYPE_PGIDLE_SET Docs/mm/damon/design: update for pgidle_set probe filter Documentation/mm/damon/design.rst | 3 ++- include/linux/damon.h | 2 ++ mm/damon/paddr.c | 6 ++++++ mm/damon/sysfs.c | 4 ++++ mm/damon/vaddr.c | 7 +++++++ 5 files changed, 21 insertions(+), 1 deletion(-) base-commit: 0dd30563c006765cf3937091901dafb02957ab45 -- 2.47.3