linux-kernel - [PATCH v2 08/16] maple_tree: Adjust node allocation on mas

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Message-Id: <20230612203953.2093911-9-Liam.Howlett@oracle.com>
Date:   Mon, 12 Jun 2023 16:39:45 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Peng Zhang <zhangpeng.00@...edance.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v2 08/16] maple_tree: Adjust node allocation on mas_rebalance()

mas_rebalance() is called to rebalance an insufficient node into a
single node or two sufficient nodes.  The preallocation estimate is
always too many in this case as the height of the tree will never grow
and there is no possibility to have a three way split in this case, so
revise the node allocation count.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index bfffbb7cab26..815c64f4c370 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3166,7 +3166,7 @@ static inline int mas_rebalance(struct ma_state *mas,
 	 * tries to combine the data in the same way.  If one node contains the
 	 * entire range of the tree, then that node is used as a new root node.
 	 */
-	mas_node_count(mas, 1 + empty_count * 3);
+	mas_node_count(mas, empty_count * 2 - 1);
 	if (mas_is_err(mas))
 		return 0;
 
-- 
2.39.2