From: Peng Zhang <[email protected]> commit 7e552dcd803f4ff60165271c573ab2e38d15769f upstream.
The last range stored in maple tree is typically quite large. By checking if it exceeds the sum of the remaining ranges in that node, it is possible to avoid checking all other gaps. Running the maple tree test suite in user mode almost always results in a near 100% hit rate for this optimization. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Peng Zhang <[email protected]> Reviewed-by: Liam R. Howlett <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Yu Kuai <[email protected]> --- lib/maple_tree.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 905fa1143f8d..1af83414877a 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -1547,6 +1547,9 @@ static unsigned long mas_leaf_max_gap(struct ma_state *mas) gap = ULONG_MAX - pivots[max_piv]; if (gap > max_gap) max_gap = gap; + + if (max_gap > pivots[max_piv] - mas->min) + return max_gap; } for (; i <= max_piv; i++) { -- 2.39.2
