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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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lib/rbtree_test.c: support rb_root_cached
We can work with a single rb_root_cached root to test both cached and non-cached rbtrees. In addition, also add a test to measure latencies between rb_first and its fast counterpart. Link: http://lkml.kernel.org/r/20170719014603.19029-7-dave@stgolabs.net Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso
Linus Torvalds
parent
977bd8d5e1
commit
b10d43f989
@ -23,14 +23,14 @@ struct test_node {
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u32 augmented;
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};
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static struct rb_root root = RB_ROOT;
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static struct rb_root_cached root = RB_ROOT_CACHED;
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static struct test_node *nodes = NULL;
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static struct rnd_state rnd;
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static void insert(struct test_node *node, struct rb_root *root)
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static void insert(struct test_node *node, struct rb_root_cached *root)
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{
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struct rb_node **new = &root->rb_node, *parent = NULL;
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struct rb_node **new = &root->rb_root.rb_node, *parent = NULL;
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u32 key = node->key;
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while (*new) {
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@ -42,14 +42,40 @@ static void insert(struct test_node *node, struct rb_root *root)
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}
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rb_link_node(&node->rb, parent, new);
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rb_insert_color(&node->rb, root);
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rb_insert_color(&node->rb, &root->rb_root);
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}
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static inline void erase(struct test_node *node, struct rb_root *root)
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static void insert_cached(struct test_node *node, struct rb_root_cached *root)
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{
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rb_erase(&node->rb, root);
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struct rb_node **new = &root->rb_root.rb_node, *parent = NULL;
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u32 key = node->key;
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bool leftmost = true;
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while (*new) {
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parent = *new;
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if (key < rb_entry(parent, struct test_node, rb)->key)
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new = &parent->rb_left;
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else {
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new = &parent->rb_right;
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leftmost = false;
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}
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}
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rb_link_node(&node->rb, parent, new);
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rb_insert_color_cached(&node->rb, root, leftmost);
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}
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static inline void erase(struct test_node *node, struct rb_root_cached *root)
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{
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rb_erase(&node->rb, &root->rb_root);
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}
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static inline void erase_cached(struct test_node *node, struct rb_root_cached *root)
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{
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rb_erase_cached(&node->rb, root);
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}
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static inline u32 augment_recompute(struct test_node *node)
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{
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u32 max = node->val, child_augmented;
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@ -71,9 +97,10 @@ static inline u32 augment_recompute(struct test_node *node)
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RB_DECLARE_CALLBACKS(static, augment_callbacks, struct test_node, rb,
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u32, augmented, augment_recompute)
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static void insert_augmented(struct test_node *node, struct rb_root *root)
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static void insert_augmented(struct test_node *node,
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struct rb_root_cached *root)
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{
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struct rb_node **new = &root->rb_node, *rb_parent = NULL;
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struct rb_node **new = &root->rb_root.rb_node, *rb_parent = NULL;
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u32 key = node->key;
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u32 val = node->val;
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struct test_node *parent;
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@ -91,12 +118,47 @@ static void insert_augmented(struct test_node *node, struct rb_root *root)
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node->augmented = val;
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rb_link_node(&node->rb, rb_parent, new);
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rb_insert_augmented(&node->rb, root, &augment_callbacks);
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rb_insert_augmented(&node->rb, &root->rb_root, &augment_callbacks);
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}
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static void erase_augmented(struct test_node *node, struct rb_root *root)
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static void insert_augmented_cached(struct test_node *node,
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struct rb_root_cached *root)
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{
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rb_erase_augmented(&node->rb, root, &augment_callbacks);
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struct rb_node **new = &root->rb_root.rb_node, *rb_parent = NULL;
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u32 key = node->key;
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u32 val = node->val;
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struct test_node *parent;
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bool leftmost = true;
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while (*new) {
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rb_parent = *new;
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parent = rb_entry(rb_parent, struct test_node, rb);
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if (parent->augmented < val)
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parent->augmented = val;
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if (key < parent->key)
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new = &parent->rb.rb_left;
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else {
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new = &parent->rb.rb_right;
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leftmost = false;
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}
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}
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node->augmented = val;
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rb_link_node(&node->rb, rb_parent, new);
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rb_insert_augmented_cached(&node->rb, root,
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leftmost, &augment_callbacks);
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}
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static void erase_augmented(struct test_node *node, struct rb_root_cached *root)
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{
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rb_erase_augmented(&node->rb, &root->rb_root, &augment_callbacks);
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}
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static void erase_augmented_cached(struct test_node *node,
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struct rb_root_cached *root)
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{
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rb_erase_augmented_cached(&node->rb, root, &augment_callbacks);
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}
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static void init(void)
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@ -125,7 +187,7 @@ static void check_postorder_foreach(int nr_nodes)
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{
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struct test_node *cur, *n;
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int count = 0;
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rbtree_postorder_for_each_entry_safe(cur, n, &root, rb)
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rbtree_postorder_for_each_entry_safe(cur, n, &root.rb_root, rb)
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count++;
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WARN_ON_ONCE(count != nr_nodes);
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@ -135,7 +197,7 @@ static void check_postorder(int nr_nodes)
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{
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struct rb_node *rb;
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int count = 0;
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for (rb = rb_first_postorder(&root); rb; rb = rb_next_postorder(rb))
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for (rb = rb_first_postorder(&root.rb_root); rb; rb = rb_next_postorder(rb))
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count++;
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WARN_ON_ONCE(count != nr_nodes);
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@ -147,7 +209,7 @@ static void check(int nr_nodes)
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int count = 0, blacks = 0;
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u32 prev_key = 0;
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for (rb = rb_first(&root); rb; rb = rb_next(rb)) {
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for (rb = rb_first(&root.rb_root); rb; rb = rb_next(rb)) {
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struct test_node *node = rb_entry(rb, struct test_node, rb);
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WARN_ON_ONCE(node->key < prev_key);
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WARN_ON_ONCE(is_red(rb) &&
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@ -162,7 +224,7 @@ static void check(int nr_nodes)
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}
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WARN_ON_ONCE(count != nr_nodes);
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WARN_ON_ONCE(count < (1 << black_path_count(rb_last(&root))) - 1);
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WARN_ON_ONCE(count < (1 << black_path_count(rb_last(&root.rb_root))) - 1);
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check_postorder(nr_nodes);
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check_postorder_foreach(nr_nodes);
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@ -173,7 +235,7 @@ static void check_augmented(int nr_nodes)
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struct rb_node *rb;
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check(nr_nodes);
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for (rb = rb_first(&root); rb; rb = rb_next(rb)) {
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for (rb = rb_first(&root.rb_root); rb; rb = rb_next(rb)) {
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struct test_node *node = rb_entry(rb, struct test_node, rb);
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WARN_ON_ONCE(node->augmented != augment_recompute(node));
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}
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@ -207,7 +269,24 @@ static int __init rbtree_test_init(void)
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time = time2 - time1;
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time = div_u64(time, perf_loops);
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printk(" -> test 1 (latency of nnodes insert+delete): %llu cycles\n", (unsigned long long)time);
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printk(" -> test 1 (latency of nnodes insert+delete): %llu cycles\n",
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(unsigned long long)time);
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time1 = get_cycles();
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for (i = 0; i < perf_loops; i++) {
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for (j = 0; j < nnodes; j++)
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insert_cached(nodes + j, &root);
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for (j = 0; j < nnodes; j++)
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erase_cached(nodes + j, &root);
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}
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, perf_loops);
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printk(" -> test 2 (latency of nnodes cached insert+delete): %llu cycles\n",
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(unsigned long long)time);
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for (i = 0; i < nnodes; i++)
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insert(nodes + i, &root);
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@ -215,7 +294,7 @@ static int __init rbtree_test_init(void)
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time1 = get_cycles();
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for (i = 0; i < perf_loops; i++) {
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for (node = rb_first(&root); node; node = rb_next(node))
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for (node = rb_first(&root.rb_root); node; node = rb_next(node))
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;
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}
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@ -223,7 +302,31 @@ static int __init rbtree_test_init(void)
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time = time2 - time1;
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time = div_u64(time, perf_loops);
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printk(" -> test 2 (latency of inorder traversal): %llu cycles\n", (unsigned long long)time);
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printk(" -> test 3 (latency of inorder traversal): %llu cycles\n",
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(unsigned long long)time);
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time1 = get_cycles();
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for (i = 0; i < perf_loops; i++)
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node = rb_first(&root.rb_root);
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, perf_loops);
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printk(" -> test 4 (latency to fetch first node)\n");
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printk(" non-cached: %llu cycles\n", (unsigned long long)time);
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time1 = get_cycles();
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for (i = 0; i < perf_loops; i++)
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node = rb_first_cached(&root);
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, perf_loops);
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printk(" cached: %llu cycles\n", (unsigned long long)time);
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for (i = 0; i < nnodes; i++)
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erase(nodes + i, &root);
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@ -261,6 +364,21 @@ static int __init rbtree_test_init(void)
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time = div_u64(time, perf_loops);
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printk(" -> test 1 (latency of nnodes insert+delete): %llu cycles\n", (unsigned long long)time);
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time1 = get_cycles();
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for (i = 0; i < perf_loops; i++) {
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for (j = 0; j < nnodes; j++)
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insert_augmented_cached(nodes + j, &root);
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for (j = 0; j < nnodes; j++)
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erase_augmented_cached(nodes + j, &root);
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}
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, perf_loops);
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printk(" -> test 2 (latency of nnodes cached insert+delete): %llu cycles\n", (unsigned long long)time);
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for (i = 0; i < check_loops; i++) {
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init();
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for (j = 0; j < nnodes; j++) {
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