linux-kernel - [PATCH v2] mm: memory-failure: remove unneeded page state check in shake

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Date:   Wed, 28 Jun 2023 09:49:29 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <naoya.horiguchi@....com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH v2] mm: memory-failure: remove unneeded page state check in shake_page()

Remove unneeded PageLRU(p) and is_free_buddy_page(p) check as slab caches
are not shrunk now. This check can be added back when a lightweight range
based shrinker is available.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>
---
v2:
  put TODO comment together with "if (PageSlab)" block per Naoya
  collect Acked-by tag per Naoya
---
 mm/memory-failure.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 5b663eca1f29..66e7b3ceaf2d 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -372,17 +372,14 @@ void shake_page(struct page *p)
 {
 	if (PageHuge(p))
 		return;
-
-	if (!PageSlab(p)) {
-		lru_add_drain_all();
-		if (PageLRU(p) || is_free_buddy_page(p))
-			return;
-	}
-
 	/*
 	 * TODO: Could shrink slab caches here if a lightweight range-based
 	 * shrinker will be available.
 	 */
+	if (PageSlab(p))
+		return;
+
+	lru_add_drain_all();
 }
 EXPORT_SYMBOL_GPL(shake_page);
 
-- 
2.27.0