This is to take into account for folios with size > 1 page.
Iterating at PAGE_SIZE increment would increment sz_filter_passed
multiple times for the same folio by folio_size, providing incorrect
stats. Hence go through the folio only once.
Fixes: 6347f3385dd0 ("mm/damon/paddr: report filter-passed bytes back for DAMOS_STAT action")
Signed-off-by: Usama Arif <usamaarif642@xxxxxxxxx>
---
mm/damon/paddr.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 6b4397de4199..cc789a97c6f5 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -504,7 +504,8 @@ static unsigned long damon_pa_stat(struct damon_region *r, struct damos *s,
if (!damon_pa_scheme_has_filter(s))
return 0;
- for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) {
+ addr = r->ar.start;
+ while (addr < r->ar.end) {
struct folio *folio = damon_get_folio(PHYS_PFN(addr));
if (!folio)
@@ -515,6 +516,7 @@ static unsigned long damon_pa_stat(struct damon_region *r, struct damos *s,
else
*sz_filter_passed += folio_size(folio);
put_folio:
+ addr += folio_size(folio);
folio_put(folio);
}
return 0;
--
2.43.5
