mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 19:26:40 +07:00
6decd63aca
A 64bit division went in unnoticed. Use do_div() to accomodate
non 64bit architectures.
Reported-by: kbuild test robot
Fixes: 1aa661f5c3
("rhashtable-test: Measure time to insert, remove & traverse entries")
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
246 lines
5.6 KiB
C
246 lines
5.6 KiB
C
/*
|
|
* Resizable, Scalable, Concurrent Hash Table
|
|
*
|
|
* Copyright (c) 2014-2015 Thomas Graf <tgraf@suug.ch>
|
|
* Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
/**************************************************************************
|
|
* Self Test
|
|
**************************************************************************/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/jhash.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/rhashtable.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define MAX_ENTRIES 1000000
|
|
#define TEST_INSERT_FAIL INT_MAX
|
|
|
|
static int entries = 50000;
|
|
module_param(entries, int, 0);
|
|
MODULE_PARM_DESC(entries, "Number of entries to add (default: 50000)");
|
|
|
|
static int runs = 4;
|
|
module_param(runs, int, 0);
|
|
MODULE_PARM_DESC(runs, "Number of test runs per variant (default: 4)");
|
|
|
|
static int max_size = 65536;
|
|
module_param(max_size, int, 0);
|
|
MODULE_PARM_DESC(runs, "Maximum table size (default: 65536)");
|
|
|
|
static bool shrinking = false;
|
|
module_param(shrinking, bool, 0);
|
|
MODULE_PARM_DESC(shrinking, "Enable automatic shrinking (default: off)");
|
|
|
|
static int size = 8;
|
|
module_param(size, int, 0);
|
|
MODULE_PARM_DESC(size, "Initial size hint of table (default: 8)");
|
|
|
|
struct test_obj {
|
|
int value;
|
|
struct rhash_head node;
|
|
};
|
|
|
|
static struct test_obj array[MAX_ENTRIES];
|
|
|
|
static struct rhashtable_params test_rht_params = {
|
|
.head_offset = offsetof(struct test_obj, node),
|
|
.key_offset = offsetof(struct test_obj, value),
|
|
.key_len = sizeof(int),
|
|
.hashfn = jhash,
|
|
.nulls_base = (3U << RHT_BASE_SHIFT),
|
|
};
|
|
|
|
static int __init test_rht_lookup(struct rhashtable *ht)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < entries * 2; i++) {
|
|
struct test_obj *obj;
|
|
bool expected = !(i % 2);
|
|
u32 key = i;
|
|
|
|
if (array[i / 2].value == TEST_INSERT_FAIL)
|
|
expected = false;
|
|
|
|
obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
|
|
|
|
if (expected && !obj) {
|
|
pr_warn("Test failed: Could not find key %u\n", key);
|
|
return -ENOENT;
|
|
} else if (!expected && obj) {
|
|
pr_warn("Test failed: Unexpected entry found for key %u\n",
|
|
key);
|
|
return -EEXIST;
|
|
} else if (expected && obj) {
|
|
if (obj->value != i) {
|
|
pr_warn("Test failed: Lookup value mismatch %u!=%u\n",
|
|
obj->value, i);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void test_bucket_stats(struct rhashtable *ht)
|
|
{
|
|
unsigned int err, total = 0, chain_len = 0;
|
|
struct rhashtable_iter hti;
|
|
struct rhash_head *pos;
|
|
|
|
err = rhashtable_walk_init(ht, &hti);
|
|
if (err) {
|
|
pr_warn("Test failed: allocation error");
|
|
return;
|
|
}
|
|
|
|
err = rhashtable_walk_start(&hti);
|
|
if (err && err != -EAGAIN) {
|
|
pr_warn("Test failed: iterator failed: %d\n", err);
|
|
return;
|
|
}
|
|
|
|
while ((pos = rhashtable_walk_next(&hti))) {
|
|
if (PTR_ERR(pos) == -EAGAIN) {
|
|
pr_info("Info: encountered resize\n");
|
|
chain_len++;
|
|
continue;
|
|
} else if (IS_ERR(pos)) {
|
|
pr_warn("Test failed: rhashtable_walk_next() error: %ld\n",
|
|
PTR_ERR(pos));
|
|
break;
|
|
}
|
|
|
|
total++;
|
|
}
|
|
|
|
rhashtable_walk_stop(&hti);
|
|
rhashtable_walk_exit(&hti);
|
|
|
|
pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d, table-jumps=%u\n",
|
|
total, atomic_read(&ht->nelems), entries, chain_len);
|
|
|
|
if (total != atomic_read(&ht->nelems) || total != entries)
|
|
pr_warn("Test failed: Total count mismatch ^^^");
|
|
}
|
|
|
|
static s64 __init test_rhashtable(struct rhashtable *ht)
|
|
{
|
|
struct test_obj *obj;
|
|
int err;
|
|
unsigned int i, insert_fails = 0;
|
|
s64 start, end;
|
|
|
|
/*
|
|
* Insertion Test:
|
|
* Insert entries into table with all keys even numbers
|
|
*/
|
|
pr_info(" Adding %d keys\n", entries);
|
|
start = ktime_get_ns();
|
|
for (i = 0; i < entries; i++) {
|
|
struct test_obj *obj = &array[i];
|
|
|
|
obj->value = i * 2;
|
|
|
|
err = rhashtable_insert_fast(ht, &obj->node, test_rht_params);
|
|
if (err == -ENOMEM || err == -EBUSY) {
|
|
/* Mark failed inserts but continue */
|
|
obj->value = TEST_INSERT_FAIL;
|
|
insert_fails++;
|
|
} else if (err) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (insert_fails)
|
|
pr_info(" %u insertions failed due to memory pressure\n",
|
|
insert_fails);
|
|
|
|
test_bucket_stats(ht);
|
|
rcu_read_lock();
|
|
test_rht_lookup(ht);
|
|
rcu_read_unlock();
|
|
|
|
test_bucket_stats(ht);
|
|
|
|
pr_info(" Deleting %d keys\n", entries);
|
|
for (i = 0; i < entries; i++) {
|
|
u32 key = i * 2;
|
|
|
|
if (array[i].value != TEST_INSERT_FAIL) {
|
|
obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
|
|
BUG_ON(!obj);
|
|
|
|
rhashtable_remove_fast(ht, &obj->node, test_rht_params);
|
|
}
|
|
}
|
|
|
|
end = ktime_get_ns();
|
|
pr_info(" Duration of test: %lld ns\n", end - start);
|
|
|
|
return end - start;
|
|
}
|
|
|
|
static struct rhashtable ht;
|
|
|
|
static int __init test_rht_init(void)
|
|
{
|
|
int i, err;
|
|
u64 total_time = 0;
|
|
|
|
entries = min(entries, MAX_ENTRIES);
|
|
|
|
test_rht_params.automatic_shrinking = shrinking;
|
|
test_rht_params.max_size = max_size;
|
|
test_rht_params.nelem_hint = size;
|
|
|
|
pr_info("Running rhashtable test nelem=%d, max_size=%d, shrinking=%d\n",
|
|
size, max_size, shrinking);
|
|
|
|
for (i = 0; i < runs; i++) {
|
|
s64 time;
|
|
|
|
pr_info("Test %02d:\n", i);
|
|
memset(&array, 0, sizeof(array));
|
|
err = rhashtable_init(&ht, &test_rht_params);
|
|
if (err < 0) {
|
|
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
|
|
err);
|
|
continue;
|
|
}
|
|
|
|
time = test_rhashtable(&ht);
|
|
rhashtable_destroy(&ht);
|
|
if (time < 0) {
|
|
pr_warn("Test failed: return code %lld\n", time);
|
|
return -EINVAL;
|
|
}
|
|
|
|
total_time += time;
|
|
}
|
|
|
|
do_div(total_time, runs);
|
|
pr_info("Average test time: %llu\n", total_time);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit test_rht_exit(void)
|
|
{
|
|
}
|
|
|
|
module_init(test_rht_init);
|
|
module_exit(test_rht_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|