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![Davidlohr Bueso](/assets/img/avatar_default.png)
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>
410 lines
9.4 KiB
C
410 lines
9.4 KiB
C
#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/rbtree_augmented.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <asm/timex.h>
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#define __param(type, name, init, msg) \
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static type name = init; \
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module_param(name, type, 0444); \
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MODULE_PARM_DESC(name, msg);
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__param(int, nnodes, 100, "Number of nodes in the rb-tree");
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__param(int, perf_loops, 100000, "Number of iterations modifying the rb-tree");
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__param(int, check_loops, 100, "Number of iterations modifying and verifying the rb-tree");
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struct test_node {
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u32 key;
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struct rb_node rb;
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/* following fields used for testing augmented rbtree functionality */
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u32 val;
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u32 augmented;
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};
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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_cached *root)
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{
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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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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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}
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rb_link_node(&node->rb, parent, new);
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rb_insert_color(&node->rb, &root->rb_root);
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}
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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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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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if (node->rb.rb_left) {
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child_augmented = rb_entry(node->rb.rb_left, struct test_node,
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rb)->augmented;
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if (max < child_augmented)
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max = child_augmented;
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}
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if (node->rb.rb_right) {
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child_augmented = rb_entry(node->rb.rb_right, struct test_node,
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rb)->augmented;
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if (max < child_augmented)
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max = child_augmented;
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}
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return max;
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}
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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,
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struct rb_root_cached *root)
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{
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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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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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}
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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->rb_root, &augment_callbacks);
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}
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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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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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{
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int i;
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for (i = 0; i < nnodes; i++) {
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nodes[i].key = prandom_u32_state(&rnd);
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nodes[i].val = prandom_u32_state(&rnd);
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}
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}
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static bool is_red(struct rb_node *rb)
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{
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return !(rb->__rb_parent_color & 1);
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}
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static int black_path_count(struct rb_node *rb)
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{
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int count;
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for (count = 0; rb; rb = rb_parent(rb))
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count += !is_red(rb);
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return count;
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}
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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_root, rb)
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count++;
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WARN_ON_ONCE(count != nr_nodes);
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}
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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_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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}
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static void check(int nr_nodes)
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{
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struct rb_node *rb;
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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_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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(!rb_parent(rb) || is_red(rb_parent(rb))));
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if (!count)
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blacks = black_path_count(rb);
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else
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WARN_ON_ONCE((!rb->rb_left || !rb->rb_right) &&
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blacks != black_path_count(rb));
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prev_key = node->key;
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count++;
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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.rb_root))) - 1);
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check_postorder(nr_nodes);
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check_postorder_foreach(nr_nodes);
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}
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static void check_augmented(int nr_nodes)
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{
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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_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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}
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static int __init rbtree_test_init(void)
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{
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int i, j;
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cycles_t time1, time2, time;
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struct rb_node *node;
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nodes = kmalloc(nnodes * sizeof(*nodes), GFP_KERNEL);
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if (!nodes)
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return -ENOMEM;
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printk(KERN_ALERT "rbtree testing");
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prandom_seed_state(&rnd, 3141592653589793238ULL);
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init();
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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(nodes + j, &root);
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for (j = 0; j < nnodes; j++)
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erase(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 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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time1 = get_cycles();
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for (i = 0; i < perf_loops; i++) {
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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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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 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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/* run checks */
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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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check(j);
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insert(nodes + j, &root);
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}
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for (j = 0; j < nnodes; j++) {
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check(nnodes - j);
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erase(nodes + j, &root);
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}
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check(0);
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}
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printk(KERN_ALERT "augmented rbtree testing");
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init();
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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(nodes + j, &root);
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for (j = 0; j < nnodes; j++)
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erase_augmented(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 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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check_augmented(j);
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insert_augmented(nodes + j, &root);
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}
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for (j = 0; j < nnodes; j++) {
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check_augmented(nnodes - j);
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erase_augmented(nodes + j, &root);
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}
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check_augmented(0);
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}
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kfree(nodes);
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return -EAGAIN; /* Fail will directly unload the module */
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}
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static void __exit rbtree_test_exit(void)
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{
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printk(KERN_ALERT "test exit\n");
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}
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module_init(rbtree_test_init)
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module_exit(rbtree_test_exit)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Michel Lespinasse");
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MODULE_DESCRIPTION("Red Black Tree test");
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