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Slab memory allocator unit test
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commit
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@ -2,6 +2,6 @@ src := bitmap.c bitops.c blake2s.c blake2b.c checksum.c event.c flowspec.c idm.c
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obj := $(src-o-files)
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$(all-daemon)
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tests_src := bitmap_test.c heap_test.c buffer_test.c event_test.c flowspec_test.c bitops_test.c patmatch_test.c fletcher16_test.c slist_test.c checksum_test.c lists_test.c mac_test.c ip_test.c hash_test.c printf_test.c
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tests_src := bitmap_test.c heap_test.c buffer_test.c event_test.c flowspec_test.c bitops_test.c patmatch_test.c fletcher16_test.c slist_test.c checksum_test.c lists_test.c mac_test.c ip_test.c hash_test.c printf_test.c slab_test.c
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tests_targets := $(tests_targets) $(tests-target-files)
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tests_objs := $(tests_objs) $(src-o-files)
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@ -394,7 +394,7 @@ slab_memsize(resource *r)
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WALK_LIST(h, s->empty_heads)
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heads++;
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size_t eff = items * s->obj_size;
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size_t eff = items * s->data_size;
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return (struct resmem) {
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.effective = eff,
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177
lib/slab_test.c
Normal file
177
lib/slab_test.c
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@ -0,0 +1,177 @@
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/*
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* BIRD Library -- Slab Alloc / Dealloc Tests
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*
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* (c) 2022 Maria Matejka <mq@jmq.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "test/birdtest.h"
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#include "lib/resource.h"
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#include "lib/bitops.h"
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static const int sizes[] = {
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8, 12, 18, 27, 41, 75, 131, 269,
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};
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#define TEST_SIZE 1024 * 128
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#define ITEMS(sz) TEST_SIZE / ( (sz) >> u32_log2((sz))/2 )
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static inline byte *test_alloc(slab *s, int sz, struct resmem *sliz)
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{
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byte *out = sl_alloc(s);
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for (int p=0; p < sz; p++)
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out[p] = p & 0xff;
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struct resmem ns = rmemsize((resource *) s);
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bt_assert(sliz->effective + sz == ns.effective);
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bt_assert((sliz->overhead - sz - ns.overhead) % page_size == 0);
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*sliz = ns;
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return out;
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}
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static inline void test_free(slab *s, byte *block, int sz, struct resmem *sliz)
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{
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for (int p=0; p < sz; p++)
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{
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bt_assert(block[p] == (p & 0xff));
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block[p]++;
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}
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sl_free(s, block);
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struct resmem ns = rmemsize((resource *) s);
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bt_assert(sliz->effective - sz == ns.effective);
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bt_assert((sliz->overhead + sz - ns.overhead) % page_size == 0);
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*sliz = ns;
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}
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static inline struct resmem get_memsize(slab *s)
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{
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struct resmem sz = rmemsize((resource *) s);
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bt_assert(sz.effective == 0);
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return sz;
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}
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static int
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t_slab_forwards(const void *data)
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{
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int sz = (intptr_t) data;
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slab *s = sl_new(&root_pool, sz);
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struct resmem sliz = get_memsize(s);
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int n = ITEMS(sz);
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byte **block = mb_alloc(&root_pool, n * sizeof(*block));
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for (int i = 0; i < n; i++)
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block[i] = test_alloc(s, sz, &sliz);
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for (int i = 0; i < n; i++)
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test_free(s, block[i], sz, &sliz);
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mb_free(block);
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return 1;
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}
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static int
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t_slab_backwards(const void *data)
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{
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int sz = (intptr_t) data;
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slab *s = sl_new(&root_pool, sz);
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struct resmem sliz = get_memsize(s);
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int n = ITEMS(sz);
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byte **block = mb_alloc(&root_pool, n * sizeof(*block));
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for (int i = 0; i < n; i++)
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block[i] = test_alloc(s, sz, &sliz);
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for (int i = n - 1; i >= 0; i--)
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test_free(s, block[i], sz, &sliz);
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mb_free(block);
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return 1;
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}
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static int
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t_slab_random(const void *data)
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{
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int sz = (intptr_t) data;
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slab *s = sl_new(&root_pool, sz);
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struct resmem sliz = get_memsize(s);
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int n = ITEMS(sz);
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byte **block = mb_alloc(&root_pool, n * sizeof(*block));
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for (int i = 0; i < n; i++)
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block[i] = test_alloc(s, sz, &sliz);
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for (int i = 0; i < n; i++)
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{
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int pos = bt_random() % (n - i);
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test_free(s, block[pos], sz, &sliz);
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if (pos != n - i - 1)
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block[pos] = block[n - i - 1];
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}
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mb_free(block);
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return 1;
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}
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static int
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t_slab_mixed(const void *data)
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{
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int sz = (intptr_t) data;
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slab *s = sl_new(&root_pool, sz);
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struct resmem sliz = get_memsize(s);
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int n = ITEMS(sz);
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byte **block = mb_alloc(&root_pool, n * sizeof(*block));
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int cur = 0;
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int pending = n;
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while (cur + pending > 0) {
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int action = bt_random() % (cur + pending);
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if (action < cur) {
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test_free(s, block[action], sz, &sliz);
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if (action != --cur)
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block[action] = block[cur];
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} else {
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block[cur++] = test_alloc(s, sz, &sliz);
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pending--;
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}
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}
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mb_free(block);
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return 1;
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}
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int main(int argc, char *argv[])
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{
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bt_init(argc, argv);
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for (uint i = 0; i < sizeof(sizes) / sizeof(*sizes); i++)
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{
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bt_test_suite_arg(t_slab_forwards, (void *) (intptr_t) sizes[i], "Slab deallocation from beginning to end, size=%d", sizes[i]);
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bt_test_suite_arg(t_slab_backwards, (void *) (intptr_t) sizes[i], "Slab deallocation from end to beginning, size=%d", sizes[i]);
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bt_test_suite_arg(t_slab_random, (void *) (intptr_t) sizes[i], "Slab deallocation in random order, size=%d", sizes[i]);
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bt_test_suite_arg(t_slab_mixed, (void *) (intptr_t) sizes[i], "Slab deallocation in mixed order, size=%d", sizes[i]);
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}
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return bt_exit_value();
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}
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