| Michel Lespinasse | fff3fd8 | 2012-10-08 16:31:23 -0700 | [diff] [blame] | 1 | #include <linux/module.h> |
| 2 | #include <linux/interval_tree.h> |
| 3 | #include <linux/random.h> |
| 4 | #include <asm/timex.h> |
| 5 | |
| 6 | #define NODES 100 |
| 7 | #define PERF_LOOPS 100000 |
| 8 | #define SEARCHES 100 |
| 9 | #define SEARCH_LOOPS 10000 |
| 10 | |
| 11 | static struct rb_root root = RB_ROOT; |
| 12 | static struct interval_tree_node nodes[NODES]; |
| 13 | static u32 queries[SEARCHES]; |
| 14 | |
| 15 | static struct rnd_state rnd; |
| 16 | |
| 17 | static inline unsigned long |
| 18 | search(unsigned long query, struct rb_root *root) |
| 19 | { |
| 20 | struct interval_tree_node *node; |
| 21 | unsigned long results = 0; |
| 22 | |
| 23 | for (node = interval_tree_iter_first(root, query, query); node; |
| 24 | node = interval_tree_iter_next(node, query, query)) |
| 25 | results++; |
| 26 | return results; |
| 27 | } |
| 28 | |
| 29 | static void init(void) |
| 30 | { |
| 31 | int i; |
| 32 | for (i = 0; i < NODES; i++) { |
| 33 | u32 a = prandom32(&rnd), b = prandom32(&rnd); |
| 34 | if (a <= b) { |
| 35 | nodes[i].start = a; |
| 36 | nodes[i].last = b; |
| 37 | } else { |
| 38 | nodes[i].start = b; |
| 39 | nodes[i].last = a; |
| 40 | } |
| 41 | } |
| 42 | for (i = 0; i < SEARCHES; i++) |
| 43 | queries[i] = prandom32(&rnd); |
| 44 | } |
| 45 | |
| 46 | static int interval_tree_test_init(void) |
| 47 | { |
| 48 | int i, j; |
| 49 | unsigned long results; |
| 50 | cycles_t time1, time2, time; |
| 51 | |
| 52 | printk(KERN_ALERT "interval tree insert/remove"); |
| 53 | |
| 54 | prandom32_seed(&rnd, 3141592653589793238ULL); |
| 55 | init(); |
| 56 | |
| 57 | time1 = get_cycles(); |
| 58 | |
| 59 | for (i = 0; i < PERF_LOOPS; i++) { |
| 60 | for (j = 0; j < NODES; j++) |
| 61 | interval_tree_insert(nodes + j, &root); |
| 62 | for (j = 0; j < NODES; j++) |
| 63 | interval_tree_remove(nodes + j, &root); |
| 64 | } |
| 65 | |
| 66 | time2 = get_cycles(); |
| 67 | time = time2 - time1; |
| 68 | |
| 69 | time = div_u64(time, PERF_LOOPS); |
| 70 | printk(" -> %llu cycles\n", (unsigned long long)time); |
| 71 | |
| 72 | printk(KERN_ALERT "interval tree search"); |
| 73 | |
| 74 | for (j = 0; j < NODES; j++) |
| 75 | interval_tree_insert(nodes + j, &root); |
| 76 | |
| 77 | time1 = get_cycles(); |
| 78 | |
| 79 | results = 0; |
| 80 | for (i = 0; i < SEARCH_LOOPS; i++) |
| 81 | for (j = 0; j < SEARCHES; j++) |
| 82 | results += search(queries[j], &root); |
| 83 | |
| 84 | time2 = get_cycles(); |
| 85 | time = time2 - time1; |
| 86 | |
| 87 | time = div_u64(time, SEARCH_LOOPS); |
| 88 | results = div_u64(results, SEARCH_LOOPS); |
| 89 | printk(" -> %llu cycles (%lu results)\n", |
| 90 | (unsigned long long)time, results); |
| 91 | |
| 92 | return -EAGAIN; /* Fail will directly unload the module */ |
| 93 | } |
| 94 | |
| 95 | static void interval_tree_test_exit(void) |
| 96 | { |
| 97 | printk(KERN_ALERT "test exit\n"); |
| 98 | } |
| 99 | |
| 100 | module_init(interval_tree_test_init) |
| 101 | module_exit(interval_tree_test_exit) |
| 102 | |
| 103 | MODULE_LICENSE("GPL"); |
| 104 | MODULE_AUTHOR("Michel Lespinasse"); |
| 105 | MODULE_DESCRIPTION("Interval Tree test"); |