mm/damon/core: use pseudo-moving sum for nr_accesses_bp

mm/damon/core: use pseudo-moving sum for nr_accesses_bp

Let nr_accesses_bp be calculated as a pseudo-moving sum that updated for
every sampling interval, using damon_moving_sum().  This is assumed to be
useful for cases that the aggregation interval is set quite huge, but the
monivoting results need to be collected earlier than next aggregation
interval is passed.

Link: https://lkml.kernel.org/r/20230915025251.72816-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>