mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
09c434b8a0
Add SPDX license identifiers to all files which:
- Have no license information of any form
- Have MODULE_LICENCE("GPL*") inside which was used in the initial
scan/conversion to ignore the file
These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:
GPL-2.0-only
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/interval_tree.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <asm/timex.h>
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#define __param(type, name, init, msg) \
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static type name = init; \
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module_param(name, type, 0444); \
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MODULE_PARM_DESC(name, msg);
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__param(int, nnodes, 100, "Number of nodes in the interval tree");
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__param(int, perf_loops, 1000, "Number of iterations modifying the tree");
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__param(int, nsearches, 100, "Number of searches to the interval tree");
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__param(int, search_loops, 1000, "Number of iterations searching the tree");
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__param(bool, search_all, false, "Searches will iterate all nodes in the tree");
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__param(uint, max_endpoint, ~0, "Largest value for the interval's endpoint");
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static struct rb_root_cached root = RB_ROOT_CACHED;
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static struct interval_tree_node *nodes = NULL;
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static u32 *queries = NULL;
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static struct rnd_state rnd;
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static inline unsigned long
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search(struct rb_root_cached *root, unsigned long start, unsigned long last)
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{
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struct interval_tree_node *node;
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unsigned long results = 0;
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for (node = interval_tree_iter_first(root, start, last); node;
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node = interval_tree_iter_next(node, start, last))
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results++;
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return results;
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}
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static void init(void)
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{
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int i;
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for (i = 0; i < nnodes; i++) {
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u32 b = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
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u32 a = (prandom_u32_state(&rnd) >> 4) % b;
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nodes[i].start = a;
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nodes[i].last = b;
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}
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/*
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* Limit the search scope to what the user defined.
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* Otherwise we are merely measuring empty walks,
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* which is pointless.
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*/
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for (i = 0; i < nsearches; i++)
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queries[i] = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
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}
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static int interval_tree_test_init(void)
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{
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int i, j;
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unsigned long results;
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cycles_t time1, time2, time;
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nodes = kmalloc_array(nnodes, sizeof(struct interval_tree_node),
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GFP_KERNEL);
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if (!nodes)
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return -ENOMEM;
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queries = kmalloc_array(nsearches, sizeof(int), GFP_KERNEL);
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if (!queries) {
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kfree(nodes);
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return -ENOMEM;
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}
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printk(KERN_ALERT "interval tree insert/remove");
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prandom_seed_state(&rnd, 3141592653589793238ULL);
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init();
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time1 = get_cycles();
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for (i = 0; i < perf_loops; i++) {
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for (j = 0; j < nnodes; j++)
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interval_tree_insert(nodes + j, &root);
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for (j = 0; j < nnodes; j++)
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interval_tree_remove(nodes + j, &root);
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}
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, perf_loops);
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printk(" -> %llu cycles\n", (unsigned long long)time);
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printk(KERN_ALERT "interval tree search");
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for (j = 0; j < nnodes; j++)
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interval_tree_insert(nodes + j, &root);
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time1 = get_cycles();
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results = 0;
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for (i = 0; i < search_loops; i++)
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for (j = 0; j < nsearches; j++) {
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unsigned long start = search_all ? 0 : queries[j];
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unsigned long last = search_all ? max_endpoint : queries[j];
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results += search(&root, start, last);
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}
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, search_loops);
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results = div_u64(results, search_loops);
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printk(" -> %llu cycles (%lu results)\n",
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(unsigned long long)time, results);
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kfree(queries);
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kfree(nodes);
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return -EAGAIN; /* Fail will directly unload the module */
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}
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static void interval_tree_test_exit(void)
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{
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printk(KERN_ALERT "test exit\n");
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}
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module_init(interval_tree_test_init)
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module_exit(interval_tree_test_exit)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Michel Lespinasse");
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MODULE_DESCRIPTION("Interval Tree test");
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