Merge branch 'rhashtable-test'
Thomas Graf says:
====================
rhashtable self-test improvements
This series improves the rhashtable self-test to:
* Avoid allocation of test objects
* Measure the time of test runs
* Use the iterator to walk the table for consistency
* Account for failed insertions due to memory pressure or
utilization pressure
* Ignore failed insertions when checking for consistency
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
10308220f3
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@ -1,14 +1,9 @@
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/*
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* Resizable, Scalable, Concurrent Hash Table
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*
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* Copyright (c) 2014 Thomas Graf <tgraf@suug.ch>
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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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* Based on the following paper:
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* https://www.usenix.org/legacy/event/atc11/tech/final_files/Triplett.pdf
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*
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* Code partially derived from nft_hash
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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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@ -26,20 +21,37 @@
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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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#define TEST_INSERT_FAIL INT_MAX
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#define TEST_HT_SIZE 8
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#define TEST_ENTRIES 2048
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#define TEST_PTR ((void *) 0xdeadbeef)
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#define TEST_NEXPANDS 4
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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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void *ptr;
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int value;
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struct rhash_head node;
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};
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static const struct rhashtable_params test_rht_params = {
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.nelem_hint = TEST_HT_SIZE,
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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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@ -51,11 +63,14 @@ 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 < TEST_ENTRIES * 2; 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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if (array[i / 2].value == TEST_INSERT_FAIL)
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expected = false;
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obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
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if (expected && !obj) {
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@ -66,9 +81,9 @@ static int __init test_rht_lookup(struct rhashtable *ht)
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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->ptr != TEST_PTR || obj->value != i) {
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pr_warn("Test failed: Lookup value mismatch %p!=%p, %u!=%u\n",
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obj->ptr, TEST_PTR, obj->value, i);
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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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@ -77,129 +92,146 @@ static int __init test_rht_lookup(struct rhashtable *ht)
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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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static void test_bucket_stats(struct rhashtable *ht)
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{
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unsigned int cnt, rcu_cnt, i, total = 0;
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unsigned int err, total = 0, chain_len = 0;
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struct rhashtable_iter hti;
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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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err = rhashtable_walk_init(ht, &hti);
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if (err) {
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pr_warn("Test failed: allocation error");
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return;
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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), TEST_ENTRIES);
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err = rhashtable_walk_start(&hti);
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if (err && err != -EAGAIN) {
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pr_warn("Test failed: iterator failed: %d\n", err);
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return;
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}
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if (total != atomic_read(&ht->nelems) || total != TEST_ENTRIES)
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while ((pos = rhashtable_walk_next(&hti))) {
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if (PTR_ERR(pos) == -EAGAIN) {
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pr_info("Info: encountered resize\n");
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chain_len++;
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continue;
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} else if (IS_ERR(pos)) {
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pr_warn("Test failed: rhashtable_walk_next() error: %ld\n",
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PTR_ERR(pos));
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break;
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}
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total++;
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}
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rhashtable_walk_stop(&hti);
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rhashtable_walk_exit(&hti);
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pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d, table-jumps=%u\n",
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total, atomic_read(&ht->nelems), entries, chain_len);
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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 int __init test_rhashtable(struct rhashtable *ht)
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static s64 __init test_rhashtable(struct rhashtable *ht)
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{
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struct bucket_table *tbl;
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struct test_obj *obj;
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struct rhash_head *pos, *next;
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int err;
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unsigned int i;
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unsigned int i, insert_fails = 0;
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s64 start, end;
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/*
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* Insertion Test:
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* Insert TEST_ENTRIES into table with all keys even numbers
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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", TEST_ENTRIES);
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for (i = 0; i < TEST_ENTRIES; i++) {
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struct test_obj *obj;
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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 = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (!obj) {
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err = -ENOMEM;
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goto error;
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}
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obj->ptr = TEST_PTR;
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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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kfree(obj);
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goto error;
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if (err == -ENOMEM || err == -EBUSY) {
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/* Mark failed inserts but continue */
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obj->value = TEST_INSERT_FAIL;
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insert_fails++;
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} else if (err) {
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return err;
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}
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}
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if (insert_fails)
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pr_info(" %u insertions failed due to memory pressure\n",
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insert_fails);
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test_bucket_stats(ht);
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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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test_bucket_stats(ht);
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pr_info(" Deleting %d keys\n", TEST_ENTRIES);
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for (i = 0; i < TEST_ENTRIES; i++) {
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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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if (array[i].value != TEST_INSERT_FAIL) {
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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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kfree(obj);
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rhashtable_remove_fast(ht, &obj->node, test_rht_params);
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}
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}
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return 0;
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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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error:
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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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rht_for_each_entry_safe(obj, pos, next, tbl, i, node)
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kfree(obj);
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return err;
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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 err;
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int i, err;
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u64 total_time = 0;
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pr_info("Running resizable hashtable tests...\n");
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entries = min(entries, MAX_ENTRIES);
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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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return err;
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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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err = test_rhashtable(&ht);
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pr_info("Average test time: %llu\n", total_time / runs);
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rhashtable_destroy(&ht);
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return err;
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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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