linux-kernel - [PATCH v3 06/11] mm/damon/paddr: support addr_unit for DAMOS

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Message-Id: <20250828171242.59810-7-sj@kernel.org>
Date: Thu, 28 Aug 2025 10:12:37 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	Quanmin Yan <yanquanmin1@...wei.com>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	wangkefeng.wang@...wei.com,
	zuoze1@...wei.com
Subject: [PATCH v3 06/11] mm/damon/paddr: support addr_unit for DAMOS_STAT

Add support of addr_unit for DAMOS_STAT action handling from the DAMOS
operation implementation for the physical address space.

Signed-off-by: SeongJae Park <sj@...nel.org>
Signed-off-by: Quanmin Yan <yanquanmin1@...wei.com>
Reviewed-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/paddr.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 0a122a8a9f1c..07a8aead439e 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -290,17 +290,18 @@ static unsigned long damon_pa_migrate(struct damon_region *r,
 	return damon_pa_core_addr(applied * PAGE_SIZE, addr_unit);
 }
 
-static unsigned long damon_pa_stat(struct damon_region *r, struct damos *s,
+static unsigned long damon_pa_stat(struct damon_region *r,
+		unsigned long addr_unit, struct damos *s,
 		unsigned long *sz_filter_passed)
 {
-	unsigned long addr;
+	phys_addr_t addr;
 	struct folio *folio;
 
 	if (!damos_ops_has_filter(s))
 		return 0;
 
-	addr = r->ar.start;
-	while (addr < r->ar.end) {
+	addr = damon_pa_phys_addr(r->ar.start, addr_unit);
+	while (addr < damon_pa_phys_addr(r->ar.end, addr_unit)) {
 		folio = damon_get_folio(PHYS_PFN(addr));
 		if (damon_pa_invalid_damos_folio(folio, s)) {
 			addr += PAGE_SIZE;
@@ -308,7 +309,7 @@ static unsigned long damon_pa_stat(struct damon_region *r, struct damos *s,
 		}
 
 		if (!damos_pa_filter_out(s, folio))
-			*sz_filter_passed += folio_size(folio);
+			*sz_filter_passed += folio_size(folio) / addr_unit;
 		addr += folio_size(folio);
 		folio_put(folio);
 	}
@@ -335,7 +336,7 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
 	case DAMOS_MIGRATE_COLD:
 		return damon_pa_migrate(r, aunit, scheme, sz_filter_passed);
 	case DAMOS_STAT:
-		return damon_pa_stat(r, scheme, sz_filter_passed);
+		return damon_pa_stat(r, aunit, scheme, sz_filter_passed);
 	default:
 		/* DAMOS actions that not yet supported by 'paddr'. */
 		break;
-- 
2.39.5