linux-kernel - [PATCH RFC v3 7/9] maple_tree: use slub percpu array

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Date:   Wed, 29 Nov 2023 10:53:32 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Matthew Wilcox <willy@...radead.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org,
        kasan-dev@...glegroups.com
Subject: [PATCH RFC v3 7/9] 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 bb24d84a4922..d9e7088fd9a7 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -6213,9 +6213,16 @@ 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);
 }
 
 /**

-- 
2.43.0