From 80333828ea7728ebe85d079bb5c1467eb9fc6c8c Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Fri, 15 Sep 2023 02:52:48 +0000 Subject: mm/damon/core: introduce nr_accesses_bp Add yet another representation of the access rate of each region, namely nr_accesses_bp. It is just same to the nr_accesses but represents the value in basis point (1 in 10,000), and updated at once in every aggregation interval. That is, moving_accesses_bp is just nr_accesses * 10000. This may seems useless at the moment. However, it will be useful for representing less than one nr_accesses value that will be needed to make moving sum-based nr_accesses. Link: https://lkml.kernel.org/r/20230915025251.72816-6-sj@kernel.org Signed-off-by: SeongJae Park Cc: Brendan Higgins Signed-off-by: Andrew Morton --- mm/damon/core.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'mm/damon/core.c') diff --git a/mm/damon/core.c b/mm/damon/core.c index b005dc15009f..ce85c00b0a4c 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -128,6 +128,7 @@ struct damon_region *damon_new_region(unsigned long start, unsigned long end) region->ar.start = start; region->ar.end = end; region->nr_accesses = 0; + region->nr_accesses_bp = 0; INIT_LIST_HEAD(®ion->list); region->age = 0; @@ -508,6 +509,7 @@ static void damon_update_monitoring_result(struct damon_region *r, { r->nr_accesses = damon_nr_accesses_for_new_attrs(r->nr_accesses, old_attrs, new_attrs); + r->nr_accesses_bp = r->nr_accesses * 10000; r->age = damon_age_for_new_attrs(r->age, old_attrs, new_attrs); } @@ -1115,6 +1117,7 @@ static void damon_merge_two_regions(struct damon_target *t, l->nr_accesses = (l->nr_accesses * sz_l + r->nr_accesses * sz_r) / (sz_l + sz_r); + l->nr_accesses_bp = l->nr_accesses * 10000; l->age = (l->age * sz_l + r->age * sz_r) / (sz_l + sz_r); l->ar.end = r->ar.end; damon_destroy_region(r, t); @@ -1138,6 +1141,8 @@ 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) @@ -1186,6 +1191,7 @@ static void damon_split_region_at(struct damon_target *t, new->age = r->age; new->last_nr_accesses = r->last_nr_accesses; + new->nr_accesses_bp = r->nr_accesses_bp; damon_insert_region(new, r, damon_next_region(r), t); } -- cgit v1.2.3-70-g09d2