linux-kernel - [PATCH] migrate_pages: modify max number of pages to migrate in batch

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Message-Id: <20240624045120.121261-1-lizhenneng@kylinos.cn>
Date: Mon, 24 Jun 2024 12:51:20 +0800
From: Zhenneng Li <lizhenneng@...inos.cn>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Zhenneng Li <lizhenneng@...inos.cn>
Subject: [PATCH] migrate_pages: modify max number of pages to migrate in batch

We restrict the number of pages to be migrated to no more than
HPAGE_PMD_NR or NR_MAX_BATCHED_MIGRATION, but in fact, the
number of pages to be migrated may reach 2*HPAGE_PMD_NR-1 or 2
*NR_MAX_BATCHED_MIGRATION-1, it's not in inconsistent with the context.

Please refer to the patch: 42012e0436d4(migrate_pages: restrict number
of pages to migrate in batch)

Signed-off-by: Zhenneng Li <lizhenneng@...inos.cn>
---
 mm/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 781979567f64..7a4b37aac9e8 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1961,7 +1961,7 @@ int migrate_pages(struct list_head *from, new_folio_t get_new_folio,
 			break;
 	}
 	if (nr_pages >= NR_MAX_BATCHED_MIGRATION)
-		list_cut_before(&folios, from, &folio2->lru);
+		list_cut_before(&folios, from, &folio->lru);
 	else
 		list_splice_init(from, &folios);
 	if (mode == MIGRATE_ASYNC)
-- 
2.25.1