+ maple_tree-avoid-ascending-when-mas-min-is-also-the-parents-minimum.patch added to mm-unstable branch

+ maple_tree-avoid-ascending-when-mas-min-is-also-the-parents-minimum.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: maple_tree: avoid ascending when mas->min is also the parent's minimum
has been added to the -mm mm-unstable branch.  Its filename is
     maple_tree-avoid-ascending-when-mas-min-is-also-the-parents-minimum.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-avoid-ascending-when-mas-min-is-also-the-parents-minimum.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Peng Zhang <zhangpeng.00@bytedance.com>
Subject: maple_tree: avoid ascending when mas->min is also the parent's minimum
Date: Mon, 20 Nov 2023 15:09:34 +0800

When the child node is the first child of its parent node, mas->min does
not need to be updated. This can reduce the number of ascending times
in some cases.

Link: https://lkml.kernel.org/r/20231120070937.35481-3-zhangpeng.00@bytedance.com
Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/maple_tree.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/lib/maple_tree.c~maple_tree-avoid-ascending-when-mas-min-is-also-the-parents-minimum
+++ a/lib/maple_tree.c
@@ -1088,14 +1088,16 @@ static int mas_ascend(struct ma_state *m
 		return 0;
 	}
 
-	if (!mas->min)
+	min = 0;
+	max = ULONG_MAX;
+	if (!mas->offset) {
+		min = mas->min;
 		set_min = true;
+	}
 
 	if (mas->max == ULONG_MAX)
 		set_max = true;
 
-	min = 0;
-	max = ULONG_MAX;
 	do {
 		p_enode = a_enode;
 		a_type = mas_parent_type(mas, p_enode);
_

Patches currently in -mm which might be from zhangpeng.00@bytedance.com are

maple_tree-add-mt_free_one-and-mt_attr-helpers.patch
maple_tree-introduce-mtreemas_lock_nested.patch
maple_tree-introduce-interfaces-__mt_dup-and-mtree_dup.patch
radix-tree-test-suite-align-kmem_cache_alloc_bulk-with-kernel-behavior.patch
maple_tree-add-test-for-mtree_dup.patch
maple_tree-update-the-documentation-of-maple-tree.patch
maple_tree-skip-other-tests-when-bench-is-enabled.patch
maple_tree-update-check_forking-and-bench_forking.patch
maple_tree-preserve-the-tree-attributes-when-destroying-maple-tree.patch
fork-use-__mt_dup-to-duplicate-maple-tree-in-dup_mmap.patch
maple_tree-move-the-check-forward-to-avoid-static-check-warning.patch
maple_tree-avoid-ascending-when-mas-min-is-also-the-parents-minimum.patch
maple_tree-remove-an-unused-parameter-for-ma_meta_end.patch
maple_tree-delete-one-of-the-two-identical-checks.patch
maple_tree-simplify-mas_leaf_set_meta.patch