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UPSTREAM: mm/damon/core: skip updating nr_accesses_bp for each aggregation interval

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damon_merge_regions_of(), which is called for each aggregation interval,
updates nr_accesses_bp to nr_accesses * 10000.  However, nr_accesses_bp is
updated for each sampling interval via damon_moving_sum() using the
aggregation interval as the moving time window.  And by the definition of
the algorithm, the value becomes same to discrete-window based sum for
each time window-aligned time.  Hence, nr_accesses_bp will be same to
nr_accesses * 10000 for each aggregation interval without explicit update.
Remove the unnecessary update of nr_accesses_bp in
damon_merge_regions_of().

Link: https://lkml.kernel.org/r/20230915025251.72816-8-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>
(cherry picked from commit 401807a316bb913f5eefcaf8343575ec9296d6b1)

Bug:407463672

Change-Id: Ie3c71d6b23a0c722ae835d4ce1f82896bc56a960
Signed-off-by: daiyang5 <daiyang5@xiaomi.com>
This commit is contained in:
SeongJae Park
2023-09-15 02:52:50 +00:00
committed by Suren Baghdasaryan
parent 5a8bcac5f6
commit 251e8ac61a
1 changed files with 0 additions and 2 deletions
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2
mm/damon/core.c
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@@ -1183,8 +1183,6 @@ static void damon_merge_regions_of(struct damon_target *t, unsigned int thres,
else
r->age++;
r->nr_accesses_bp = r->nr_accesses * 10000;
if (prev && prev->ar.end == r->ar.start &&
abs(prev->nr_accesses - r->nr_accesses) <= thres &&
damon_sz_region(prev) + damon_sz_region(r) <= sz_limit)