Commit bdbe1d7b authored by Usama Arif's avatar Usama Arif Committed by Andrew Morton
Browse files

mm/damon/paddr: increment pa_stat damon address range by folio size 

This is to avoid going through all the pages in a folio.  For folio_size >
PAGE_SIZE, damon_get_folio will return NULL for tail pages, so the for
loop in those instances will be a nop.  Have a more efficient loop by just
incrementing the address by folio_size.

Link: https://lkml.kernel.org/r/20250113190738.1156381-1-usamaarif642@gmail.com


Signed-off-by: default avatarUsama Arif <usamaarif642@gmail.com>
Reviewed-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent bf069012

mm/damon/paddr.c

+6 −2
Original line number Diff line number Diff line
@@ -504,17 +504,21 @@ 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)

		if (!folio) {

			addr += PAGE_SIZE;

			continue;

		}



		if (damos_pa_filter_out(s, folio))

			goto put_folio;

		else

			*sz_filter_passed += folio_size(folio);

put_folio:

		addr += folio_size(folio);

		folio_put(folio);

	}

	return 0;