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| author |  Peng Zhang <zhangpeng.00@bytedance.com>
| 2023-12-15 15:46:32 +0800 |
|---|---|---|
| committer |  Andrew Morton <akpm@linux-foundation.org>
| 2023-12-20 14:48:14 -0800 |
| commit | 7e552dcd803f4ff60165271c573ab2e38d15769f (patch) | |
| tree | e21e4895f508b6f2e9d12722accb4edf6c8a8eb5 /lib/maple_tree.c | |
| parent | mm/memory: replace kmap() with kmap_local_page() (diff) | |
| download | linux-7e552dcd803f4ff60165271c573ab2e38d15769f.tar.gz linux-7e552dcd803f4ff60165271c573ab2e38d15769f.tar.bz2 linux-7e552dcd803f4ff60165271c573ab2e38d15769f.zip | |
maple_tree: avoid checking other gaps after getting the largest gap
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/20231215074632.82045-1-zhangpeng.00@bytedance.com
Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib/maple_tree.c')
| -rw-r--r-- | lib/maple_tree.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/maple_tree.c b/lib/maple_tree.c index c9a970ea20dd..6f241bb38799 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -1518,6 +1518,9 @@ 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++) { |