#include <linux/module.h> #include <linux/interval_tree.h> #include <linux/random.h> #include <asm/timex.h> #define NODES 100 #define PERF_LOOPS 100000 #define SEARCHES 100 #define SEARCH_LOOPS 10000 static struct rb_root root = RB_ROOT; static struct interval_tree_node nodes[NODES]; static u32 queries[SEARCHES]; static struct rnd_state rnd; static inline unsigned long search(unsigned long query, struct rb_root *root) { struct interval_tree_node *node; unsigned long results = 0; for (node = interval_tree_iter_first(root, query, query); node; node = interval_tree_iter_next(node, query, query)) results++; return results; } static void init(void) { int i; for (i = 0; i < NODES; i++) { u32 a = prandom_u32_state(&rnd); u32 b = prandom_u32_state(&rnd); if (a <= b) { nodes[i].start = a; nodes[i].last = b; } else { nodes[i].start = b; nodes[i].last = a; } } for (i = 0; i < SEARCHES; i++) queries[i] = prandom_u32_state(&rnd); } static int interval_tree_test_init(void) { int i, j; unsigned long results; cycles_t time1, time2, time; printk(KERN_ALERT "interval tree insert/remove"); prandom_seed_state(&rnd, 3141592653589793238ULL); init(); time1 = get_cycles(); for (i = 0; i < PERF_LOOPS; i++) { for (j = 0; j < NODES; j++) interval_tree_insert(nodes + j, &root); for (j = 0; j < NODES; j++) interval_tree_remove(nodes + j, &root); } time2 = get_cycles(); time = time2 - time1; time = div_u64(time, PERF_LOOPS); printk(" -> %llu cycles\n", (unsigned long long)time); printk(KERN_ALERT "interval tree search"); for (j = 0; j < NODES; j++) interval_tree_insert(nodes + j, &root); time1 = get_cycles(); results = 0; for (i = 0; i < SEARCH_LOOPS; i++) for (j = 0; j < SEARCHES; j++) results += search(queries[j], &root); time2 = get_cycles(); time = time2 - time1; time = div_u64(time, SEARCH_LOOPS); results = div_u64(results, SEARCH_LOOPS); printk(" -> %llu cycles (%lu results)\n", (unsigned long long)time, results); return -EAGAIN; /* Fail will directly unload the module */ } static void interval_tree_test_exit(void) { printk(KERN_ALERT "test exit\n"); } module_init(interval_tree_test_init) module_exit(interval_tree_test_exit) MODULE_LICENSE("GPL"); MODULE_AUTHOR("Michel Lespinasse"); MODULE_DESCRIPTION("Interval Tree test");