linux-kernel - [PATCH v3 11/16] mm/huge_memory: try to free subpage in swapcache when possible

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Date:   Mon, 4 Jul 2022 21:21:56 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <shy828301@...il.com>, <willy@...radead.org>, <zokeefe@...gle.com>,
        <songmuchun@...edance.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v3 11/16] mm/huge_memory: try to free subpage in swapcache when possible

Subpages in swapcache won't be freed even if it is the last user of the
page until next time reclaim. It shouldn't hurt indeed, but we could try
to free these pages to save more memory for system.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/huge_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 8a40dc8edb7a..6d95751ebfc9 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2643,7 +2643,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
 		 * requires taking the lru_lock so we do the put_page
 		 * of the tail pages after the split is complete.
 		 */
-		put_page(subpage);
+		free_page_and_swap_cache(subpage);
 	}
 }
 
-- 
2.23.0