By far the most expensive part of the selftest was the allocation of entries. Using a static array allows to measure the rhashtable operations. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
231 lines
5.2 KiB
C
231 lines
5.2 KiB
C
/*
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* Resizable, Scalable, Concurrent Hash Table
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*
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* Copyright (c) 2014-2015 Thomas Graf <tgraf@suug.ch>
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* Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/**************************************************************************
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* Self Test
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**************************************************************************/
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#include <linux/init.h>
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#include <linux/jhash.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rcupdate.h>
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#include <linux/rhashtable.h>
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#include <linux/slab.h>
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#define MAX_ENTRIES 1000000
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static int entries = 50000;
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module_param(entries, int, 0);
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MODULE_PARM_DESC(entries, "Number of entries to add (default: 50000)");
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static int runs = 4;
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module_param(runs, int, 0);
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MODULE_PARM_DESC(runs, "Number of test runs per variant (default: 4)");
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static int max_size = 65536;
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module_param(max_size, int, 0);
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MODULE_PARM_DESC(runs, "Maximum table size (default: 65536)");
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static bool shrinking = false;
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module_param(shrinking, bool, 0);
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MODULE_PARM_DESC(shrinking, "Enable automatic shrinking (default: off)");
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static int size = 8;
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module_param(size, int, 0);
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MODULE_PARM_DESC(size, "Initial size hint of table (default: 8)");
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struct test_obj {
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int value;
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struct rhash_head node;
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};
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static struct test_obj array[MAX_ENTRIES];
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static struct rhashtable_params test_rht_params = {
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.head_offset = offsetof(struct test_obj, node),
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.key_offset = offsetof(struct test_obj, value),
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.key_len = sizeof(int),
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.hashfn = jhash,
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.nulls_base = (3U << RHT_BASE_SHIFT),
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};
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static int __init test_rht_lookup(struct rhashtable *ht)
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{
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unsigned int i;
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for (i = 0; i < entries * 2; i++) {
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struct test_obj *obj;
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bool expected = !(i % 2);
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u32 key = i;
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obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
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if (expected && !obj) {
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pr_warn("Test failed: Could not find key %u\n", key);
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return -ENOENT;
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} else if (!expected && obj) {
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pr_warn("Test failed: Unexpected entry found for key %u\n",
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key);
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return -EEXIST;
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} else if (expected && obj) {
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if (obj->value != i) {
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pr_warn("Test failed: Lookup value mismatch %u!=%u\n",
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obj->value, i);
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return -EINVAL;
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}
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}
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}
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return 0;
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}
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static void test_bucket_stats(struct rhashtable *ht, bool quiet)
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{
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unsigned int cnt, rcu_cnt, i, total = 0;
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struct rhash_head *pos;
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struct test_obj *obj;
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struct bucket_table *tbl;
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tbl = rht_dereference_rcu(ht->tbl, ht);
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for (i = 0; i < tbl->size; i++) {
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rcu_cnt = cnt = 0;
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if (!quiet)
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pr_info(" [%#4x/%u]", i, tbl->size);
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rht_for_each_entry_rcu(obj, pos, tbl, i, node) {
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cnt++;
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total++;
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if (!quiet)
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pr_cont(" [%p],", obj);
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}
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rht_for_each_entry_rcu(obj, pos, tbl, i, node)
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rcu_cnt++;
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if (rcu_cnt != cnt)
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pr_warn("Test failed: Chain count mismach %d != %d",
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cnt, rcu_cnt);
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if (!quiet)
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pr_cont("\n [%#x] first element: %p, chain length: %u\n",
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i, tbl->buckets[i], cnt);
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}
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pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d\n",
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total, atomic_read(&ht->nelems), entries);
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if (total != atomic_read(&ht->nelems) || total != entries)
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pr_warn("Test failed: Total count mismatch ^^^");
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}
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static s64 __init test_rhashtable(struct rhashtable *ht)
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{
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struct test_obj *obj;
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int err;
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unsigned int i;
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s64 start, end;
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/*
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* Insertion Test:
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* Insert entries into table with all keys even numbers
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*/
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pr_info(" Adding %d keys\n", entries);
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start = ktime_get_ns();
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for (i = 0; i < entries; i++) {
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struct test_obj *obj = &array[i];
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obj->value = i * 2;
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err = rhashtable_insert_fast(ht, &obj->node, test_rht_params);
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if (err)
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return err;
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}
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rcu_read_lock();
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test_bucket_stats(ht, true);
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test_rht_lookup(ht);
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rcu_read_unlock();
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rcu_read_lock();
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test_bucket_stats(ht, true);
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rcu_read_unlock();
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pr_info(" Deleting %d keys\n", entries);
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for (i = 0; i < entries; i++) {
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u32 key = i * 2;
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obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
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BUG_ON(!obj);
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rhashtable_remove_fast(ht, &obj->node, test_rht_params);
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}
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end = ktime_get_ns();
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pr_info(" Duration of test: %lld ns\n", end - start);
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return end - start;
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}
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static struct rhashtable ht;
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static int __init test_rht_init(void)
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{
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int i, err;
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u64 total_time = 0;
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entries = min(entries, MAX_ENTRIES);
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test_rht_params.automatic_shrinking = shrinking;
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test_rht_params.max_size = max_size;
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test_rht_params.nelem_hint = size;
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pr_info("Running rhashtable test nelem=%d, max_size=%d, shrinking=%d\n",
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size, max_size, shrinking);
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for (i = 0; i < runs; i++) {
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s64 time;
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pr_info("Test %02d:\n", i);
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memset(&array, 0, sizeof(array));
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err = rhashtable_init(&ht, &test_rht_params);
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if (err < 0) {
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pr_warn("Test failed: Unable to initialize hashtable: %d\n",
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err);
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continue;
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}
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time = test_rhashtable(&ht);
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rhashtable_destroy(&ht);
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if (time < 0) {
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pr_warn("Test failed: return code %lld\n", time);
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return -EINVAL;
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}
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total_time += time;
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}
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pr_info("Average test time: %llu\n", total_time / runs);
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return 0;
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}
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static void __exit test_rht_exit(void)
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{
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}
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module_init(test_rht_init);
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module_exit(test_rht_exit);
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MODULE_LICENSE("GPL v2");
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