linux-kernel - [PATCHv2 01/11] mm/migrate: Transfer PG

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Message-ID: <20250115093135.3288234-2-kirill.shutemov@linux.intel.com>
Date: Wed, 15 Jan 2025 11:31:25 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Jens Axboe <axboe@...nel.dk>
Cc: "Jason A. Donenfeld" <Jason@...c4.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andi Shyti <andi.shyti@...ux.intel.com>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Christian Brauner <brauner@...nel.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	David Airlie <airlied@...il.com>,
	David Hildenbrand <david@...hat.com>,
	Hao Ge <gehao@...inos.cn>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Josef Bacik <josef@...icpanda.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	Nhat Pham <nphamcs@...il.com>,
	Oscar Salvador <osalvador@...e.de>,
	Ran Xiaokai <ran.xiaokai@....com.cn>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Simona Vetter <simona@...ll.ch>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Vlastimil Babka <vbabka@...e.cz>,
	Yosry Ahmed <yosryahmed@...gle.com>,
	Yu Zhao <yuzhao@...gle.com>,
	intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCHv2 01/11] mm/migrate: Transfer PG_dropbehind to the new folio

Do not lose the flag on page migration.

Ideally, these folios should be freed instead of migration. But it
requires to find right spot do this and proper testing.

Transfer the flag for now.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/migrate.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/migrate.c b/mm/migrate.c
index caadbe393aa2..690efa064bee 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -682,6 +682,10 @@ void folio_migrate_flags(struct folio *newfolio, struct folio *folio)
 	if (folio_test_dirty(folio))
 		folio_set_dirty(newfolio);
 
+	/* TODO: free the folio on migration? */
+	if (folio_test_dropbehind(folio))
+		folio_set_dropbehind(newfolio);
+
 	if (folio_test_young(folio))
 		folio_set_young(newfolio);
 	if (folio_test_idle(folio))
-- 
2.45.2