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
search(unsigned long query,struct rb_root * root)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
init(void)29 static void init(void)
30 {
31 int i;
32 for (i = 0; i < NODES; i++) {
33 u32 a = prandom_u32_state(&rnd);
34 u32 b = prandom_u32_state(&rnd);
35 if (a <= b) {
36 nodes[i].start = a;
37 nodes[i].last = b;
38 } else {
39 nodes[i].start = b;
40 nodes[i].last = a;
41 }
42 }
43 for (i = 0; i < SEARCHES; i++)
44 queries[i] = prandom_u32_state(&rnd);
45 }
46
interval_tree_test_init(void)47 static int interval_tree_test_init(void)
48 {
49 int i, j;
50 unsigned long results;
51 cycles_t time1, time2, time;
52
53 printk(KERN_ALERT "interval tree insert/remove");
54
55 prandom_seed_state(&rnd, 3141592653589793238ULL);
56 init();
57
58 time1 = get_cycles();
59
60 for (i = 0; i < PERF_LOOPS; i++) {
61 for (j = 0; j < NODES; j++)
62 interval_tree_insert(nodes + j, &root);
63 for (j = 0; j < NODES; j++)
64 interval_tree_remove(nodes + j, &root);
65 }
66
67 time2 = get_cycles();
68 time = time2 - time1;
69
70 time = div_u64(time, PERF_LOOPS);
71 printk(" -> %llu cycles\n", (unsigned long long)time);
72
73 printk(KERN_ALERT "interval tree search");
74
75 for (j = 0; j < NODES; j++)
76 interval_tree_insert(nodes + j, &root);
77
78 time1 = get_cycles();
79
80 results = 0;
81 for (i = 0; i < SEARCH_LOOPS; i++)
82 for (j = 0; j < SEARCHES; j++)
83 results += search(queries[j], &root);
84
85 time2 = get_cycles();
86 time = time2 - time1;
87
88 time = div_u64(time, SEARCH_LOOPS);
89 results = div_u64(results, SEARCH_LOOPS);
90 printk(" -> %llu cycles (%lu results)\n",
91 (unsigned long long)time, results);
92
93 return -EAGAIN; /* Fail will directly unload the module */
94 }
95
interval_tree_test_exit(void)96 static void interval_tree_test_exit(void)
97 {
98 printk(KERN_ALERT "test exit\n");
99 }
100
101 module_init(interval_tree_test_init)
102 module_exit(interval_tree_test_exit)
103
104 MODULE_LICENSE("GPL");
105 MODULE_AUTHOR("Michel Lespinasse");
106 MODULE_DESCRIPTION("Interval Tree test");
107