rhashtable-test: calculate max_entries value by default

A maximum table size of 64k entries is insufficient for the multiple
threads test even in default configuration (10 threads * 50000 objects =
500000 objects in total). Since we know how many objects will be
inserted, calculate the max size unless overridden by parameter.

Note that specifying the exact number of objects upon table init won't
suffice as that value is being rounded down to the next power of two -
anticipate this by rounding up to the next power of two in beforehand.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c
index cfc3440f17e7b16272555df0c310eb6a4743b867..6fa77b3f0e805ddd03b396c7d150ff55647d1fbb 100644 (file)
--- a/lib/test_rhashtable.c
+++ b/lib/test_rhashtable.c
@@ -36,9 +36,9 @@ 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;
+static int max_size = 0;
 module_param(max_size, int, 0);
-MODULE_PARM_DESC(runs, "Maximum table size (default: 65536)");
+MODULE_PARM_DESC(runs, "Maximum table size (default: calculated)");
 
 static bool shrinking = false;
 module_param(shrinking, bool, 0);
@@ -321,7 +321,7 @@ static int __init test_rht_init(void)
        entries = min(entries, MAX_ENTRIES);
 
        test_rht_params.automatic_shrinking = shrinking;
-       test_rht_params.max_size = max_size;
+       test_rht_params.max_size = max_size ? : roundup_pow_of_two(entries);
        test_rht_params.nelem_hint = size;
 
        pr_info("Running rhashtable test nelem=%d, max_size=%d, shrinking=%d\n",
@@ -367,6 +367,8 @@ static int __init test_rht_init(void)
                return -ENOMEM;
        }
 
+       test_rht_params.max_size = max_size ? :
+                                  roundup_pow_of_two(tcount * entries);
        err = rhashtable_init(&ht, &test_rht_params);
        if (err < 0) {
                pr_warn("Test failed: Unable to initialize hashtable: %d\n",