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@xxxxxxxxx>
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@xxxxxxxxx
Signed-off-by: Usama Arif <usamaarif642@xxxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxx are
mm-damon-paddr-increment-pa_stat-damon-address-range-by-folio-size.patch
