linux-kernel - [PATCH 2/3] mm/slub: remove full list manipulation for non-debug slab

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Message-Id: <20240117-slab-misc-v1-2-fd1c49ccbe70@bytedance.com>
Date: Wed, 17 Jan 2024 11:45:59 +0000
From: Chengming Zhou <zhouchengming@...edance.com>
To: Hyeonggon Yoo <42.hyeyoo@...il.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Vlastimil Babka <vbabka@...e.cz>,
 Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>, David Rientjes <rientjes@...gle.com>
Cc: linux-mm@...ck.org, Chengming Zhou <zhouchengming@...edance.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] mm/slub: remove full list manipulation for non-debug slab

Since debug slab is processed by free_to_partial_list(), and only debug
slab which has SLAB_STORE_USER flag would care about the full list, we
can remove these unrelated full list manipulations from __slab_free().

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 mm/slub.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 20c03555c97b..f0307e8b4cd2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4187,7 +4187,6 @@ static void __slab_free(struct kmem_cache *s, struct slab *slab,
 	 * then add it.
 	 */
 	if (!kmem_cache_has_cpu_partial(s) && unlikely(!prior)) {
-		remove_full(s, n, slab);
 		add_partial(n, slab, DEACTIVATE_TO_TAIL);
 		stat(s, FREE_ADD_PARTIAL);
 	}
@@ -4201,9 +4200,6 @@ static void __slab_free(struct kmem_cache *s, struct slab *slab,
 		 */
 		remove_partial(n, slab);
 		stat(s, FREE_REMOVE_PARTIAL);
-	} else {
-		/* Slab must be on the full list */
-		remove_full(s, n, slab);
 	}
 
 	spin_unlock_irqrestore(&n->list_lock, flags);

-- 
b4 0.10.1