linux-kernel - [PATCH 7/8] mm/mglru: Check PG_dropcache instead of PG_reclaim in lru_gen_folio

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Message-ID: <20250113093453.1932083-8-kirill.shutemov@linux.intel.com>
Date: Mon, 13 Jan 2025 11:34:52 +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: [PATCH 7/8] mm/mglru: Check PG_dropcache instead of PG_reclaim in lru_gen_folio_seq()

Kernel sets PG_dropcache instead of PG_reclaim everywhere. Check
PG_dropcache in lru_gen_folio_seq().

No need to check for dirty and writeback as there's no conflict with
PG_readahead anymore.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/mm_inline.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index f9157a0c42a5..f353d3c610ac 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -241,8 +241,7 @@ static inline unsigned long lru_gen_folio_seq(struct lruvec *lruvec, struct foli
 	else if (reclaiming)
 		gen = MAX_NR_GENS;
 	else if ((!folio_is_file_lru(folio) && !folio_test_swapcache(folio)) ||
-		 (folio_test_reclaim(folio) &&
-		  (folio_test_dirty(folio) || folio_test_writeback(folio))))
+		 folio_test_dropbehind(folio))
 		gen = MIN_NR_GENS;
 	else
 		gen = MAX_NR_GENS - folio_test_workingset(folio);
-- 
2.45.2