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test_rhashtable: add a check for max_size 

add a test that tries to insert more than max_size elements.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2017-09-20 01:12:13 +02:00 committed by David S. Miller
parent f651616e79
commit a6359bd8dd
1 changed files with 41 additions and 0 deletions
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41
lib/test_rhashtable.c
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@ -246,6 +246,43 @@ static s64 __init test_rhashtable(struct rhashtable *ht, struct test_obj *array,
static struct rhashtable ht;
static int __init test_rhashtable_max(struct test_obj *array,
unsigned int entries)
{
unsigned int i, insert_retries = 0;
int err;
test_rht_params.max_size = roundup_pow_of_two(entries / 8);
err = rhashtable_init(&ht, &test_rht_params);
if (err)
return err;
for (i = 0; i < ht.max_elems; i++) {
struct test_obj *obj = &array[i];
obj->value.id = i * 2;
err = insert_retry(&ht, obj, test_rht_params);
if (err > 0)
insert_retries += err;
else if (err)
return err;
}
err = insert_retry(&ht, &array[ht.max_elems], test_rht_params);
if (err == -E2BIG) {
err = 0;
} else {
pr_info("insert element %u should have failed with %d, got %d\n",
ht.max_elems, -E2BIG, err);
if (err == 0)
err = -1;
}
rhashtable_destroy(&ht);
return err;
}
static int thread_lookup_test(struct thread_data *tdata)
{
unsigned int entries = tdata->entries;
@ -386,7 +423,11 @@ static int __init test_rht_init(void)
total_time += time;
}
pr_info("test if its possible to exceed max_size %d: %s\n",
test_rht_params.max_size, test_rhashtable_max(objs, entries) == 0 ?
"no, ok" : "YES, failed");
vfree(objs);
do_div(total_time, runs);
pr_info("Average test time: %llu\n", total_time);