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rbtree: Add rb_add_augmented_cached() helper 

While slightly sub-optimal, updating the augmented data while going
down the tree during lookup would be faster -- alas the augment
interface does not currently allow for that, provide a generic helper
to add a node to an augmented cached tree.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230531124603.862983648@infradead.org
This commit is contained in:
Peter Zijlstra 2023-05-31 13:58:43 +02:00 committed by Ingo Molnar
parent 86bfbb7ce4
commit 99d4d26551
1 changed files with 26 additions and 0 deletions
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26
include/linux/rbtree_augmented.h
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@ -60,6 +60,32 @@ rb_insert_augmented_cached(struct rb_node *node,
rb_insert_augmented(node, &root->rb_root, augment);
}
static __always_inline struct rb_node *
rb_add_augmented_cached(struct rb_node *node, struct rb_root_cached *tree,
bool (*less)(struct rb_node *, const struct rb_node *),
const struct rb_augment_callbacks *augment)
{
struct rb_node **link = &tree->rb_root.rb_node;
struct rb_node *parent = NULL;
bool leftmost = true;
while (*link) {
parent = *link;
if (less(node, parent)) {
link = &parent->rb_left;
} else {
link = &parent->rb_right;
leftmost = false;
}
}
rb_link_node(node, parent, link);
augment->propagate(parent, NULL); /* suboptimal */
rb_insert_augmented_cached(node, tree, leftmost, augment);
return leftmost ? node : NULL;
}
/*
* Template for declaring augmented rbtree callbacks (generic case)
*