diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/test_rhashtable.c | 100 |
1 files changed, 69 insertions, 31 deletions
diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c index c60fd5d9eb6b..e3d31bf527a9 100644 --- a/lib/test_rhashtable.c +++ b/lib/test_rhashtable.c @@ -1,14 +1,9 @@ /* * Resizable, Scalable, Concurrent Hash Table * - * Copyright (c) 2014 Thomas Graf <tgraf@suug.ch> + * Copyright (c) 2014-2015 Thomas Graf <tgraf@suug.ch> * Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net> * - * Based on the following paper: - * https://www.usenix.org/legacy/event/atc11/tech/final_files/Triplett.pdf - * - * Code partially derived from nft_hash - * * 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. @@ -27,9 +22,28 @@ #include <linux/slab.h> -#define TEST_HT_SIZE 8 -#define TEST_ENTRIES 2048 #define TEST_PTR ((void *) 0xdeadbeef) +#define MAX_ENTRIES 1000000 + +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 { void *ptr; @@ -37,8 +51,7 @@ struct test_obj { struct rhash_head node; }; -static const struct rhashtable_params test_rht_params = { - .nelem_hint = TEST_HT_SIZE, +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), @@ -50,7 +63,7 @@ static int __init test_rht_lookup(struct rhashtable *ht) { unsigned int i; - for (i = 0; i < TEST_ENTRIES * 2; i++) { + for (i = 0; i < entries * 2; i++) { struct test_obj *obj; bool expected = !(i % 2); u32 key = i; @@ -110,26 +123,28 @@ static void test_bucket_stats(struct rhashtable *ht, bool quiet) } pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d\n", - total, atomic_read(&ht->nelems), TEST_ENTRIES); + total, atomic_read(&ht->nelems), entries); - if (total != atomic_read(&ht->nelems) || total != TEST_ENTRIES) + if (total != atomic_read(&ht->nelems) || total != entries) pr_warn("Test failed: Total count mismatch ^^^"); } -static int __init test_rhashtable(struct rhashtable *ht) +static s64 __init test_rhashtable(struct rhashtable *ht) { struct bucket_table *tbl; struct test_obj *obj; struct rhash_head *pos, *next; int err; unsigned int i; + s64 start, end; /* * Insertion Test: - * Insert TEST_ENTRIES into table with all keys even numbers + * Insert entries into table with all keys even numbers */ - pr_info(" Adding %d keys\n", TEST_ENTRIES); - for (i = 0; i < TEST_ENTRIES; i++) { + pr_info(" Adding %d keys\n", entries); + start = ktime_get_ns(); + for (i = 0; i < entries; i++) { struct test_obj *obj; obj = kzalloc(sizeof(*obj), GFP_KERNEL); @@ -157,8 +172,8 @@ static int __init test_rhashtable(struct rhashtable *ht) test_bucket_stats(ht, true); rcu_read_unlock(); - pr_info(" Deleting %d keys\n", TEST_ENTRIES); - for (i = 0; i < TEST_ENTRIES; i++) { + pr_info(" Deleting %d keys\n", entries); + for (i = 0; i < entries; i++) { u32 key = i * 2; obj = rhashtable_lookup_fast(ht, &key, test_rht_params); @@ -168,7 +183,10 @@ static int __init test_rhashtable(struct rhashtable *ht) kfree(obj); } - return 0; + end = ktime_get_ns(); + pr_info(" Duration of test: %lld ns\n", end - start); + + return end - start; error: tbl = rht_dereference_rcu(ht->tbl, ht); @@ -183,22 +201,42 @@ static struct rhashtable ht; static int __init test_rht_init(void) { - int err; + int i, err; + u64 total_time = 0; - pr_info("Running resizable hashtable tests...\n"); + entries = min(entries, MAX_ENTRIES); - err = rhashtable_init(&ht, &test_rht_params); - if (err < 0) { - pr_warn("Test failed: Unable to initialize hashtable: %d\n", - err); - return err; - } + test_rht_params.automatic_shrinking = shrinking; + test_rht_params.max_size = max_size; + test_rht_params.nelem_hint = size; - err = test_rhashtable(&ht); + pr_info("Running rhashtable test nelem=%d, max_size=%d, shrinking=%d\n", + size, max_size, shrinking); - rhashtable_destroy(&ht); + for (i = 0; i < runs; i++) { + s64 time; - return err; + pr_info("Test %02d:\n", i); + 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; + } + + pr_info("Average test time: %llu\n", total_time / runs); + + return 0; } static void __exit test_rht_exit(void) |