rhashtable-test: Measure time to insert, remove & traverse entries

Make test configurable by allowing to specify all relevant knobs
through module parameters.

Do several test runs and measure the average time it takes to
insert & remove all entries. Note, a deferred resize might still
continue to run in the background.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

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)