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test_rhashtable: don't allocate huge static array

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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 01:12:11 +02:00 committed by David S. Miller
parent 3d5cc728c4
commit 7e936bd734
1 changed files with 16 additions and 11 deletions
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27
lib/test_rhashtable.c
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@ -72,8 +72,6 @@ struct thread_data {
struct test_obj *objs;
};
static struct test_obj array[MAX_ENTRIES];
static struct rhashtable_params test_rht_params = {
.head_offset = offsetof(struct test_obj, node),
.key_offset = offsetof(struct test_obj, value),
@ -85,7 +83,7 @@ static struct rhashtable_params test_rht_params = {
static struct semaphore prestart_sem;
static struct semaphore startup_sem = __SEMAPHORE_INITIALIZER(startup_sem, 0);
static int insert_retry(struct rhashtable *ht, struct rhash_head *obj,
static int insert_retry(struct rhashtable *ht, struct test_obj *obj,
const struct rhashtable_params params)
{
int err, retries = -1, enomem_retries = 0;
@ -93,7 +91,7 @@ static int insert_retry(struct rhashtable *ht, struct rhash_head *obj,
do {
retries++;
cond_resched();
err = rhashtable_insert_fast(ht, obj, params);
err = rhashtable_insert_fast(ht, &obj->node, params);
if (err == -ENOMEM && enomem_retry) {
enomem_retries++;
err = -EBUSY;
@ -107,7 +105,7 @@ static int insert_retry(struct rhashtable *ht, struct rhash_head *obj,
return err ? : retries;
}
static int __init test_rht_lookup(struct rhashtable *ht)
static int __init test_rht_lookup(struct rhashtable *ht, struct test_obj *array)
{
unsigned int i;
@ -186,7 +184,7 @@ static void test_bucket_stats(struct rhashtable *ht)
pr_warn("Test failed: Total count mismatch ^^^");
}
static s64 __init test_rhashtable(struct rhashtable *ht)
static s64 __init test_rhashtable(struct rhashtable *ht, struct test_obj *array)
{
struct test_obj *obj;
int err;
@ -203,7 +201,7 @@ static s64 __init test_rhashtable(struct rhashtable *ht)
struct test_obj *obj = &array[i];
obj->value.id = i * 2;
err = insert_retry(ht, &obj->node, test_rht_params);
err = insert_retry(ht, obj, test_rht_params);
if (err > 0)
insert_retries += err;
else if (err)
@ -216,7 +214,7 @@ static s64 __init test_rhashtable(struct rhashtable *ht)
test_bucket_stats(ht);
rcu_read_lock();
test_rht_lookup(ht);
test_rht_lookup(ht, array);
rcu_read_unlock();
test_bucket_stats(ht);
@ -286,7 +284,7 @@ static int threadfunc(void *data)
for (i = 0; i < entries; i++) {
tdata->objs[i].value.id = i;
tdata->objs[i].value.tid = tdata->id;
err = insert_retry(&ht, &tdata->objs[i].node, test_rht_params);
err = insert_retry(&ht, &tdata->objs[i], test_rht_params);
if (err > 0) {
insert_retries += err;
} else if (err) {
@ -349,6 +347,10 @@ static int __init test_rht_init(void)
test_rht_params.max_size = max_size ? : roundup_pow_of_two(entries);
test_rht_params.nelem_hint = size;
objs = vzalloc((test_rht_params.max_size + 1) * sizeof(struct test_obj));
if (!objs)
return -ENOMEM;
pr_info("Running rhashtable test nelem=%d, max_size=%d, shrinking=%d\n",
size, max_size, shrinking);
@ -356,7 +358,8 @@ static int __init test_rht_init(void)
s64 time;
pr_info("Test %02d:\n", i);
memset(&array, 0, sizeof(array));
memset(objs, 0, test_rht_params.max_size * sizeof(struct test_obj));
err = rhashtable_init(&ht, &test_rht_params);
if (err < 0) {
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
@ -364,9 +367,10 @@ static int __init test_rht_init(void)
continue;
}
time = test_rhashtable(&ht);
time = test_rhashtable(&ht, objs);
rhashtable_destroy(&ht);
if (time < 0) {
vfree(objs);
pr_warn("Test failed: return code %lld\n", time);
return -EINVAL;
}
@ -374,6 +378,7 @@ static int __init test_rht_init(void)
total_time += time;
}
vfree(objs);
do_div(total_time, runs);
pr_info("Average test time: %llu\n", total_time);