Revision b11e7b81bf94f633ae44f12a3d2e198277781952 authored by Linus Torvalds on 27 September 2015, 00:56:50 UTC, committed by Linus Torvalds on 27 September 2015, 00:56:50 UTC
Pull staging driver fixes from Greg KH: "Here are some tiny staging driver and documentation fixes for 4.3-rc3. All of these resolve reported issues that people have found and have been in the linux-next tree for a while with no problems" * tag 'staging-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: MAINTAINERS: Update email address for Martyn Welch staging: ion: fix corruption of ion_import_dma_buf staging: dgap: Remove myself from the MAINTAINERS file staging: most: Add dependency to HAS_IOMEM staging: unisys: remove reference of visorutil staging: unisys: visornic: handle error return from device registration staging: unisys: stop device registration before visorbus registration staging: unisys: visorbus: Unregister driver on error staging: unisys: visornic: Fix receive bytes statistics staging: unisys: unregister netdev when create debugfs fails staging: fbtft: replace master->setup() with spi_setup() staging: fbtft: fix 9-bit SPI support detection staging/lustre: change Lustre URLs and mailing list staging/android: Update ION TODO per LPC discussion Staging: most: MOST and MOSTCORE should depend on HAS_DMA staging: most: fix HDM_USB dependencies and build errors
interval_tree_test.c
#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");
Computing file changes ...