linux-kernel - Re: [RFC PATCH -next 05/16] mm/damon/paddr: support addr_unit for MIGRATE

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Message-Id: <20250819062116.39593-1-sj@kernel.org>
Date: Mon, 18 Aug 2025 23:21:16 -0700
From: SeongJae Park <sj@...nel.org>
To: Quanmin Yan <yanquanmin1@...wei.com>
Cc: SeongJae Park <sj@...nel.org>,
	akpm@...ux-foundation.org,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	wangkefeng.wang@...wei.com,
	zuoze1@...wei.com
Subject: Re: [RFC PATCH -next 05/16] mm/damon/paddr: support addr_unit for MIGRATE_{HOT,COLD}

Hi Quanmin,

On Wed, 13 Aug 2025 13:06:55 +0800 Quanmin Yan <yanquanmin1@...wei.com> wrote:

> From: SeongJae Park <sj@...nel.org>
> 
> Add support of addr_unit for DAMOS_MIGRATE_HOT and DAMOS_MIGRATE_COLD
> action handling from the DAMOS operation implementation for the physical
> address space.

As I suggested on another reply[1], please squash attaching patch to this one
when you post next version of this series.

[1] https://lore.kernel.org/0001-mm-damon-paddr-set-DAMOS_PAGEOUT-stat-in-core-addres.patch

[...]


Thanks,
SJ

==== Attachment 0 (0001-mm-damon-paddr-set-DAMOS_MIGRATE_-HOT-COLD-stat-in-c.patch) ====
>From f491a6a940444799dfe1e76433234d1849a21c58 Mon Sep 17 00:00:00 2001
From: SeongJae Park <sj@...nel.org>
Date: Wed, 13 Aug 2025 21:27:59 -0700
Subject: [PATCH] mm/damon/paddr: set DAMOS_MIGRATE_{HOT,COLD} stat in core
 address unit

Operations layer should set DAMOS stat in core layer address unit, but
paddr is returning that for MIGRATE_{HOT,COLD} in paddr address unit.
Fix it.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/paddr.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index bb3b149b75ba..0305e59818da 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -247,8 +247,7 @@ static unsigned long damon_pa_migrate(struct damon_region *r,
 		unsigned long addr_unit, struct damos *s,
 		unsigned long *sz_filter_passed)
 {
-	phys_addr_t addr;
-	unsigned long applied;
+	phys_addr_t addr, applied;
 	LIST_HEAD(folio_list);
 	struct folio *folio;
 
@@ -263,7 +262,7 @@ static unsigned long damon_pa_migrate(struct damon_region *r,
 		if (damos_pa_filter_out(s, folio))
 			goto put_folio;
 		else
-			*sz_filter_passed += folio_size(folio);
+			*sz_filter_passed += folio_size(folio) / addr_unit;
 
 		if (!folio_isolate_lru(folio))
 			goto put_folio;
@@ -275,7 +274,7 @@ static unsigned long damon_pa_migrate(struct damon_region *r,
 	applied = damon_migrate_pages(&folio_list, s->target_nid);
 	cond_resched();
 	s->last_applied = folio;
-	return applied * PAGE_SIZE;
+	return applied * PAGE_SIZE / addr_unit;
 }
 
 static unsigned long damon_pa_stat(struct damon_region *r, struct damos *s,
-- 
2.39.5