mm/damon: implement a new DAMOS filter type for active pages

mm/damon: implement a new DAMOS filter type for active pages

Patch series "mm/damon: introduce DAMOS filter type for active pages".

The memory reclaim algorithm categorizes pages into active and inactive
lists, separately for file and anon pages.  The system's performance
relies heavily on the (relative and absolute) accuracy of this
categorization.

This patch series add a new DAMOS filter for pages' activeness, giving us
visibility into the access frequency of the pages on each list.  This
insight can help us diagnose issues with the active-inactive balancing
dynamics, and make decisions to optimize reclaim efficiency and memory
utilization.

For instance, we might decide to enable DAMON_LRU_SORT, if we find that
there are pages on the active list that are infrequently accessed, or less
frequently accessed than pages on the inactive list.

This patch (of 2):

Implement a DAMOS filter type for active pages on DAMON kernel API, and
add support of it from the physical address space DAMON operations set
(paddr).

Link: https://lkml.kernel.org/r/20250318183029.2062917-1-nphamcs@gmail.com
Link: https://lkml.kernel.org/r/20250318183029.2062917-2-nphamcs@gmail.com
Signed-off-by: Nhat Pham <nphamcs@gmail.com>
Suggested-by: SeongJae Park <sj@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>