[1/9] mm/damon/core: make DAMOS uses nr_accesses_bp instead of nr_accesses

Commit Message

SeongJae Park Sept. 16, 2023, 2:09 a.m. UTC

DAMON provides nr_accesses_bp, which becomes same to nr_accesses * 10000
for every aggregation interval, but updated every sampling interval with
a reasonable accuracy.  Since DAMON-based operation schemes are applied
in every aggregation interval using nr_accesses, using nr_accesses_bp
instead will make no difference to users.  Meanwhile, it allows DAMOS to
apply the schemes in a time interval that less than the aggregation
interval.  It could be useful and more flexible for some cases.  Do it.

Signed-off-by: SeongJae Park <[e-mail]>
---
 mm/damon/core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Patch

diff --git a/mm/damon/core.c b/mm/damon/core.c
index b15cf47d2d29..79fef5145a4b 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -770,12 +770,13 @@  static void damon_split_region_at(struct damon_target *t,
 static bool __damos_valid_target(struct damon_region *r, struct damos *s)
 {
 	unsigned long sz;
+	unsigned int nr_accesses = r->nr_accesses_bp / 10000;
 
 	sz = damon_sz_region(r);
 	return s->pattern.min_sz_region <= sz &&
 		sz <= s->pattern.max_sz_region &&
-		s->pattern.min_nr_accesses <= r->nr_accesses &&
-		r->nr_accesses <= s->pattern.max_nr_accesses &&
+		s->pattern.min_nr_accesses <= nr_accesses &&
+		nr_accesses <= s->pattern.max_nr_accesses &&
 		s->pattern.min_age_region <= r->age &&
 		r->age <= s->pattern.max_age_region;
 }