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Patch series "mm/damon: introduce DAMOS filter type for unmapped pages". User decides whether their memory will be mapped or unmapped. It implies that the two types of memory can have different characteristics and management requirements. Provide the DAMON-observaibility DAMOS-operation capability for the different types by introducing a new DAMOS filter type for unmapped pages. This patch (of 2): Implement yet another DAMOS filter type for unmapped pages on DAMON kernel API, and add support of it from the physical address space DAMON operations set (paddr). Since it is for only unmapped pages, support from the virtual address spaces DAMON operations set (vaddr) is not required. Link: https://lkml.kernel.org/r/20250219220146.133650-1-sj@kernel.org Link: https://lkml.kernel.org/r/20250219220146.133650-2-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>