+ mm-damon-paddr-increment-pa_stat-damon-address-range-by-folio-size.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/damon/paddr: increment pa_stat damon address range by folio size
has been added to the -mm mm-unstable branch.  Its filename is
     mm-damon-paddr-increment-pa_stat-damon-address-range-by-folio-size.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-paddr-increment-pa_stat-damon-address-range-by-folio-size.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Usama Arif <usamaarif642@gmail.com>
Subject: mm/damon/paddr: increment pa_stat damon address range by folio size
Date: Mon, 13 Jan 2025 19:07:38 +0000

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>
---

 mm/damon/paddr.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/mm/damon/paddr.c~mm-damon-paddr-increment-pa_stat-damon-address-range-by-folio-size
+++ a/mm/damon/paddr.c
@@ -504,17 +504,21 @@ static unsigned long damon_pa_stat(struc
 	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;
_

Patches currently in -mm which might be from usamaarif642@gmail.com are

mm-damon-paddr-increment-pa_stat-damon-address-range-by-folio-size.patch