mm/damon/reclaim: add autotune_monitoring_intervals parameter

mm/damon/reclaim: add autotune_monitoring_intervals parameter

Patch series "mm/damon/reclaim: support monitoring intervals auto-tuning".

The monitoring intervals auto-tuning feature of DAMON has proven to be
useful in multiple environments.  Add a new DAMON_RECLAIM parameter for
supporting the feature, and update the document for the new parameter.

This patch (of 2):

DAMON's monitoring intervals auto-tuning feature has proven to be useful
in multiple environments.  DAMON_RECLAIM is still asking users to do the
manual tuning of the intervals.  Add a module parameter for utilizing the
auto-tuning feature with the suggested default setup.

Note that use of the auto-tuning overrides the manually entered monitoring
intervals.  Also, note that the 'min_age' will dynamically changed
proportional to auto-tuned intervals.  It is recommended to use 'min_age'
short enough and use 'quota_mem_pressure_us' like coldness threshold
auto-tuning features together.

Link: https://lore.kernel.org/20260501011740.81988-1-sj@kernel.org
Link: https://lore.kernel.org/20260501011740.81988-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>