138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/interval_tree.h>
|
|
#include <linux/random.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/timex.h>
|
|
|
|
#define __param(type, name, init, msg) \
|
|
static type name = init; \
|
|
module_param(name, type, 0444); \
|
|
MODULE_PARM_DESC(name, msg);
|
|
|
|
__param(int, nnodes, 100, "Number of nodes in the interval tree");
|
|
__param(int, perf_loops, 1000, "Number of iterations modifying the tree");
|
|
|
|
__param(int, nsearches, 100, "Number of searches to the interval tree");
|
|
__param(int, search_loops, 1000, "Number of iterations searching the tree");
|
|
__param(bool, search_all, false, "Searches will iterate all nodes in the tree");
|
|
|
|
__param(uint, max_endpoint, ~0, "Largest value for the interval's endpoint");
|
|
|
|
static struct rb_root_cached root = RB_ROOT_CACHED;
|
|
static struct interval_tree_node *nodes = NULL;
|
|
static u32 *queries = NULL;
|
|
|
|
static struct rnd_state rnd;
|
|
|
|
static inline unsigned long
|
|
search(struct rb_root_cached *root, unsigned long start, unsigned long last)
|
|
{
|
|
struct interval_tree_node *node;
|
|
unsigned long results = 0;
|
|
|
|
for (node = interval_tree_iter_first(root, start, last); node;
|
|
node = interval_tree_iter_next(node, start, last))
|
|
results++;
|
|
return results;
|
|
}
|
|
|
|
static void init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nnodes; i++) {
|
|
u32 b = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
|
|
u32 a = (prandom_u32_state(&rnd) >> 4) % b;
|
|
|
|
nodes[i].start = a;
|
|
nodes[i].last = b;
|
|
}
|
|
|
|
/*
|
|
* Limit the search scope to what the user defined.
|
|
* Otherwise we are merely measuring empty walks,
|
|
* which is pointless.
|
|
*/
|
|
for (i = 0; i < nsearches; i++)
|
|
queries[i] = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
|
|
}
|
|
|
|
static int interval_tree_test_init(void)
|
|
{
|
|
int i, j;
|
|
unsigned long results;
|
|
cycles_t time1, time2, time;
|
|
|
|
nodes = kmalloc(nnodes * sizeof(struct interval_tree_node), GFP_KERNEL);
|
|
if (!nodes)
|
|
return -ENOMEM;
|
|
|
|
queries = kmalloc(nsearches * sizeof(int), GFP_KERNEL);
|
|
if (!queries) {
|
|
kfree(nodes);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
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 < nnodes; j++)
|
|
interval_tree_insert(nodes + j, &root);
|
|
for (j = 0; j < nnodes; 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 < nnodes; j++)
|
|
interval_tree_insert(nodes + j, &root);
|
|
|
|
time1 = get_cycles();
|
|
|
|
results = 0;
|
|
for (i = 0; i < search_loops; i++)
|
|
for (j = 0; j < nsearches; j++) {
|
|
unsigned long start = search_all ? 0 : queries[j];
|
|
unsigned long last = search_all ? max_endpoint : queries[j];
|
|
|
|
results += search(&root, start, last);
|
|
}
|
|
|
|
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);
|
|
|
|
kfree(queries);
|
|
kfree(nodes);
|
|
|
|
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");
|