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1#include <linux/module.h>
2#include <linux/moduleparam.h>
3#include <linux/interval_tree.h>
4#include <linux/random.h>
5#include <linux/slab.h>
6#include <asm/timex.h>
7
8#define __param(type, name, init, msg) \
9 static type name = init; \
10 module_param(name, type, 0444); \
11 MODULE_PARM_DESC(name, msg);
12
13__param(int, nnodes, 100, "Number of nodes in the interval tree");
14__param(int, perf_loops, 1000, "Number of iterations modifying the tree");
15
16__param(int, nsearches, 100, "Number of searches to the interval tree");
17__param(int, search_loops, 1000, "Number of iterations searching the tree");
18__param(bool, search_all, false, "Searches will iterate all nodes in the tree");
19
20__param(uint, max_endpoint, ~0, "Largest value for the interval's endpoint");
21
22static struct rb_root_cached root = RB_ROOT_CACHED;
23static struct interval_tree_node *nodes = NULL;
24static u32 *queries = NULL;
25
26static struct rnd_state rnd;
27
28static inline unsigned long
29search(struct rb_root_cached *root, unsigned long start, unsigned long last)
30{
31 struct interval_tree_node *node;
32 unsigned long results = 0;
33
34 for (node = interval_tree_iter_first(root, start, last); node;
35 node = interval_tree_iter_next(node, start, last))
36 results++;
37 return results;
38}
39
40static void init(void)
41{
42 int i;
43
44 for (i = 0; i < nnodes; i++) {
45 u32 b = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
46 u32 a = (prandom_u32_state(&rnd) >> 4) % b;
47
48 nodes[i].start = a;
49 nodes[i].last = b;
50 }
51
52 /*
53 * Limit the search scope to what the user defined.
54 * Otherwise we are merely measuring empty walks,
55 * which is pointless.
56 */
57 for (i = 0; i < nsearches; i++)
58 queries[i] = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
59}
60
61static int interval_tree_test_init(void)
62{
63 int i, j;
64 unsigned long results;
65 cycles_t time1, time2, time;
66
67 nodes = kmalloc(nnodes * sizeof(struct interval_tree_node), GFP_KERNEL);
68 if (!nodes)
69 return -ENOMEM;
70
71 queries = kmalloc(nsearches * sizeof(int), GFP_KERNEL);
72 if (!queries) {
73 kfree(nodes);
74 return -ENOMEM;
75 }
76
77 printk(KERN_ALERT "interval tree insert/remove");
78
79 prandom_seed_state(&rnd, 3141592653589793238ULL);
80 init();
81
82 time1 = get_cycles();
83
84 for (i = 0; i < perf_loops; i++) {
85 for (j = 0; j < nnodes; j++)
86 interval_tree_insert(nodes + j, &root);
87 for (j = 0; j < nnodes; j++)
88 interval_tree_remove(nodes + j, &root);
89 }
90
91 time2 = get_cycles();
92 time = time2 - time1;
93
94 time = div_u64(time, perf_loops);
95 printk(" -> %llu cycles\n", (unsigned long long)time);
96
97 printk(KERN_ALERT "interval tree search");
98
99 for (j = 0; j < nnodes; j++)
100 interval_tree_insert(nodes + j, &root);
101
102 time1 = get_cycles();
103
104 results = 0;
105 for (i = 0; i < search_loops; i++)
106 for (j = 0; j < nsearches; j++) {
107 unsigned long start = search_all ? 0 : queries[j];
108 unsigned long last = search_all ? max_endpoint : queries[j];
109
110 results += search(&root, start, last);
111 }
112
113 time2 = get_cycles();
114 time = time2 - time1;
115
116 time = div_u64(time, search_loops);
117 results = div_u64(results, search_loops);
118 printk(" -> %llu cycles (%lu results)\n",
119 (unsigned long long)time, results);
120
121 kfree(queries);
122 kfree(nodes);
123
124 return -EAGAIN; /* Fail will directly unload the module */
125}
126
127static void interval_tree_test_exit(void)
128{
129 printk(KERN_ALERT "test exit\n");
130}
131
132module_init(interval_tree_test_init)
133module_exit(interval_tree_test_exit)
134
135MODULE_LICENSE("GPL");
136MODULE_AUTHOR("Michel Lespinasse");
137MODULE_DESCRIPTION("Interval Tree test");