linux-kernel - [RFC v1 3/5] maple_tree: use slub percpu array

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Date:   Tue,  8 Aug 2023 11:53:46 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Vlastimil Babka <vbabka@...e.cz>
Subject: [RFC v1 3/5] maple_tree: use slub percpu array

Just make sure the maple_node_cache has a percpu array of size 32.

Will break with CONFIG_SLAB.
---
 lib/maple_tree.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 4dd73cf936a6..1196d0a17f03 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -6180,9 +6180,16 @@ bool mas_nomem(struct ma_state *mas, gfp_t gfp)
 
 void __init maple_tree_init(void)
 {
+	int ret;
+
 	maple_node_cache = kmem_cache_create("maple_node",
 			sizeof(struct maple_node), sizeof(struct maple_node),
-			SLAB_PANIC, NULL);
+			SLAB_PANIC | SLAB_NO_MERGE, NULL);
+
+	ret = kmem_cache_setup_percpu_array(maple_node_cache, 32);
+
+	if (ret)
+		pr_warn("error %d creating percpu_array for maple_node_cache\n", ret);
 }
 
 /**
-- 
2.41.0