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maple_tree: adjust node allocation on mas_rebalance()

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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.

Link: https://lkml.kernel.org/r/20230724183157.3939892-9-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Peng Zhang <zhangpeng.00@bytedance.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-07-24 14:31:50 -04:00 committed by Andrew Morton
parent da0892547b
commit c108df767f
1 changed files with 1 additions and 1 deletions
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lib/maple_tree.c
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@ -3136,7 +3136,7 @@ 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;