The patch titled
Subject: maple_tree: use cached node end in mas_next()
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-use-cached-node-end-in-mas_next.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-use-cached-node-end-in-mas_next.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: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: maple_tree: use cached node end in mas_next()
Date: Wed, 1 Nov 2023 13:16:22 -0400
When looking for the next entry, don't recalculate the node end as it is
now tracked in the maple state.
Link: https://lkml.kernel.org/r/20231101171629.3612299-6-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
--- a/lib/maple_tree.c~maple_tree-use-cached-node-end-in-mas_next
+++ a/lib/maple_tree.c
@@ -4539,6 +4539,7 @@ static inline int mas_next_node(struct m
unsigned long min;
unsigned long *pivots;
struct maple_enode *enode;
+ struct maple_node *tmp;
int level = 0;
unsigned char node_end;
enum maple_type mt;
@@ -4591,6 +4592,10 @@ static inline int mas_next_node(struct m
pivots = ma_pivots(node, mt);
mas->max = mas_safe_pivot(mas, pivots, mas->offset, mt);
+ tmp = mte_to_node(enode);
+ mt = mte_node_type(enode);
+ pivots = ma_pivots(tmp, mt);
+ mas->end = ma_data_end(tmp, mt, pivots, mas->max);
if (unlikely(ma_dead_node(node)))
return 1;
@@ -4625,7 +4630,6 @@ static void *mas_next_slot(struct ma_sta
unsigned long pivot;
enum maple_type type;
struct maple_node *node;
- unsigned char data_end;
unsigned long save_point = mas->last;
void *entry;
@@ -4633,12 +4637,11 @@ retry:
node = mas_mn(mas);
type = mte_node_type(mas->node);
pivots = ma_pivots(node, type);
- data_end = ma_data_end(node, type, pivots, mas->max);
if (unlikely(mas_rewalk_if_dead(mas, node, save_point)))
goto retry;
if (mas->max >= max) {
- if (likely(mas->offset < data_end))
+ if (likely(mas->offset < mas->end))
pivot = pivots[mas->offset];
else
goto overflow;
@@ -4650,11 +4653,11 @@ retry:
goto overflow;
}
- if (likely(mas->offset < data_end)) {
+ if (likely(mas->offset < mas->end)) {
mas->index = pivots[mas->offset] + 1;
again:
mas->offset++;
- if (likely(mas->offset < data_end))
+ if (likely(mas->offset < mas->end))
mas->last = pivots[mas->offset];
else
mas->last = mas->max;
@@ -4691,7 +4694,6 @@ again:
goto overflow;
mas->index = mas->last + 1;
- /* Node cannot end on NULL, so it's safe to short-cut here */
goto again;
}
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
maple_tree-remove-unnecessary-default-labels-from-switch-statements.patch
maple_tree-make-mas_erase-more-robust.patch
maple_tree-move-debug-check-to-__mas_set_range.patch
maple_tree-add-end-of-node-tracking-to-the-maple-state.patch
maple_tree-use-cached-node-end-in-mas_next.patch
maple_tree-use-cached-node-end-in-mas_destroy.patch
maple_tree-clean-up-inlines-for-some-functions.patch
maple_tree-separate-ma_state-node-from-status.patch
maple_tree-separate-ma_state-node-from-status-fix-1.patch
maple_tree-separate-ma_state-node-from-status-fix-2.patch
maple_tree-remove-mas_searchable.patch
maple_tree-use-maple-state-end-for-write-operations.patch
maple_tree-dont-find-node-end-in-mtree_lookup_walk.patch
maple_tree-mtree_range_walk-clean-up.patch
