Patch series "mm/damon: add a DAMOS filter type for page granularity
access recheck".

DAMON provides its best-effort accuracy-overhead tradeoff under the
user-defined ranges of acceptable level of the monitoring accuracy and
overhead.  A recent discussion for tiered memory management support from
DAMON[1] concluded that finding memory regions of specific access pattern
with low overhead despite of low accuracy via DAMON first, and then double
checking the access of the region again in a finer (e.g., page)
granularity could be a useful strategy for some DAMOS schemes.

Add a new type of DAMOS filter, namely 'young' for such a case.  It checks
each page of DAMOS target region is accessed since the last check, and
filters it out or in if 'matching' parameter is 'true' or 'false',
respectively.

Because this is a filter type that applied in page granularity, the
support depends on DAMON operations set, similar to 'anon' and 'memcg'
DAMOS filter types.  Implement the support on the DAMON operations set for
the physical address space, 'paddr', since one of the expected usages[1]
is based on the physical address space.

[1] https://lore.kernel.org/r/20240227235121.153277-1-sj@kernel.org


This patch (of 7):

damon_pa_young() receives physical address, get the folio covering the
address, and show if the folio is accessed since the last check.  A
following commit will reuse the internal logic for checking access to a
given folio.  To avoid duplication of the code, split the internal logic. 
Also, change the rmap walker function's name from __damon_pa_young() to
damon_folio_young_one(), following the change of the caller's name and the
naming rule that more commonly used by other rmap walkers.

Link: https://lkml.kernel.org/r/20240426195247.100306-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20240426195247.100306-2-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Tested-by: Honggyu Kim <honggyu.kim@sk.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>