From: Usama Arif <usamaarif642@gmail.com>
Date: Mon, 13 Jan 2025 19:07:38 +0000 (+0000)
Subject: mm/damon/paddr: increment pa_stat damon address range by folio size
X-Git-Tag: v6.14-rc1~77^2~37
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bdbe1d7bc325dbe77335f39b265620f9accc0ae9;p=thirdparty%2Fkernel%2Flinux.git

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: Usama Arif <usamaarif642@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 6b4397de41995..bd8cfe10121ba 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -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;