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#include <linux/module.h>
#include <linux/prio_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 prio_tree_root root;
static struct prio_tree_node nodes[NODES];
static u32 queries[SEARCHES];
static struct rnd_state rnd;
static inline unsigned long
search(unsigned long query, struct prio_tree_root *root)
{
struct prio_tree_iter iter;
unsigned long results = 0;
prio_tree_iter_init(&iter, root, query, query);
while (prio_tree_next(&iter))
results++;
return results;
}
static void init(void)
{
int i;
for (i = 0; i < NODES; i++) {
u32 a = prandom32(&rnd), b = prandom32(&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] = prandom32(&rnd);
}
static int prio_tree_test_init(void)
{
int i, j;
unsigned long results;
cycles_t time1, time2, time;
printk(KERN_ALERT "prio tree insert/remove");
prandom32_seed(&rnd, 3141592653589793238ULL);
INIT_PRIO_TREE_ROOT(&root);
init();
time1 = get_cycles();
for (i = 0; i < PERF_LOOPS; i++) {
for (j = 0; j < NODES; j++)
prio_tree_insert(&root, nodes + j);
for (j = 0; j < NODES; j++)
prio_tree_remove(&root, nodes + j);
}
time2 = get_cycles();
time = time2 - time1;
time = div_u64(time, PERF_LOOPS);
printk(" -> %llu cycles\n", (unsigned long long)time);
printk(KERN_ALERT "prio tree search");
for (j = 0; j < NODES; j++)
prio_tree_insert(&root, nodes + j);
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 prio_tree_test_exit(void)
{
printk(KERN_ALERT "test exit\n");
}
module_init(prio_tree_test_init)
module_exit(prio_tree_test_exit)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michel Lespinasse");
MODULE_DESCRIPTION("Prio Tree test");
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