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/*
* BIRD Library -- Slab Alloc / Dealloc Tests
*
* (c) 2022 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "test/birdtest.h"
#include "lib/resource.h"
#include "lib/bitops.h"
static const int sizes[] = {
8, 12, 18, 27, 41, 75, 131, 269,
};
#define TEST_SIZE 1024 * 128
#define ITEMS(sz) TEST_SIZE / ( (sz) >> u32_log2((sz))/2 )
struct test_request {
int size;
enum strategy {
TEST_NONE,
TEST_FORWARDS,
TEST_BACKWARDS,
TEST_RANDOM,
TEST_MIXED,
TEST__MAX,
} strategy;
};
const char * const strategy_name[TEST__MAX] = {
[TEST_FORWARDS] = "forwards",
[TEST_BACKWARDS] = "backwards",
[TEST_RANDOM] = "random",
[TEST_MIXED] = "mixed",
};
static inline byte *test_alloc(slab *s, int sz, struct resmem *sliz)
{
byte *out = sl_alloc(s);
for (int p=0; p < sz; p++)
out[p] = p & 0xff;
struct resmem ns = rmemsize((resource *) s);
bt_assert(sliz->effective + sz == ns.effective);
bt_assert((sliz->overhead - sz - ns.overhead) % page_size == 0);
*sliz = ns;
return out;
}
static inline void test_free(slab *s, byte *block, int sz, struct resmem *sliz)
{
for (int p=0; p < sz; p++)
{
bt_assert(block[p] == (p & 0xff));
block[p]++;
}
sl_free(block);
struct resmem ns = rmemsize((resource *) s);
bt_assert(sliz->effective - sz == ns.effective);
bt_assert((sliz->overhead + sz - ns.overhead) % page_size == 0);
*sliz = ns;
}
static inline struct resmem get_memsize(slab *s)
{
struct resmem sz = rmemsize((resource *) s);
bt_assert(sz.effective == 0);
return sz;
}
static int
t_slab(const void *data)
{
const struct test_request *tr = data;
int sz = tr->size;
slab *s = sl_new(&root_pool, sz);
struct resmem sliz = get_memsize(s);
int n = ITEMS(sz);
byte **block = mb_alloc(&root_pool, n * sizeof(*block));
switch (tr->strategy) {
case TEST_FORWARDS:
for (int i = 0; i < n; i++)
block[i] = test_alloc(s, sz, &sliz);
for (int i = 0; i < n; i++)
test_free(s, block[i], sz, &sliz);
break;
case TEST_BACKWARDS:
for (int i = 0; i < n; i++)
block[i] = test_alloc(s, sz, &sliz);
for (int i = n - 1; i >= 0; i--)
test_free(s, block[i], sz, &sliz);
break;
case TEST_RANDOM:
for (int i = 0; i < n; i++)
block[i] = test_alloc(s, sz, &sliz);
for (int i = 0; i < n; i++)
{
int pos = bt_random() % (n - i);
test_free(s, block[pos], sz, &sliz);
if (pos != n - i - 1)
block[pos] = block[n - i - 1];
}
break;
case TEST_MIXED:
{
int cur = 0;
int pending = n;
while (cur + pending > 0) {
int action = bt_random() % (cur + pending);
if (action < cur) {
test_free(s, block[action], sz, &sliz);
if (action != --cur)
block[action] = block[cur];
} else {
block[cur++] = test_alloc(s, sz, &sliz);
pending--;
}
}
break;
}
default: bug("This shouldn't happen");
}
mb_free(block);
return 1;
}
int main(int argc, char *argv[])
{
bt_init(argc, argv);
struct test_request tr;
for (uint i = 0; i < sizeof(sizes) / sizeof(*sizes); i++)
for (uint strategy = TEST_FORWARDS; strategy < TEST__MAX; strategy++)
{
tr = (struct test_request) {
.size = sizes[i],
.strategy = strategy,
};
bt_test_suite_arg(t_slab, &tr, "Slab allocator test, size=%d, strategy=%s",
tr.size, strategy_name[strategy]);
}
return bt_exit_value();
}
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