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https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 23:36:23 +09:00
bpf: Add lru_hash_lookup performance test
Create a new case to test the LRU lookup performance. At the beginning, the LRU map is fully loaded (i.e. the number of keys is equal to map->max_entries). The lookup is done through key 0 to num_map_entries and then repeats from 0 again. This patch also creates an anonymous struct to properly name the test params in stress_lru_hmap_alloc() in map_perf_test_kern.c. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau
David S. Miller
parent
08daaec742
commit
637cd8c312
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@ -88,6 +88,13 @@ struct bpf_map_def SEC("maps") array_map = {
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.max_entries = MAX_ENTRIES,
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};
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struct bpf_map_def SEC("maps") lru_hash_lookup_map = {
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.type = BPF_MAP_TYPE_LRU_HASH,
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.key_size = sizeof(u32),
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.value_size = sizeof(long),
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.max_entries = MAX_ENTRIES,
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};
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SEC("kprobe/sys_getuid")
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int stress_hmap(struct pt_regs *ctx)
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{
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@ -148,12 +155,23 @@ int stress_percpu_hmap_alloc(struct pt_regs *ctx)
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SEC("kprobe/sys_connect")
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int stress_lru_hmap_alloc(struct pt_regs *ctx)
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{
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char fmt[] = "Failed at stress_lru_hmap_alloc. ret:%dn";
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union {
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u16 dst6[8];
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struct {
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u16 magic0;
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u16 magic1;
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u16 tcase;
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u16 unused16;
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u32 unused32;
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u32 key;
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};
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} test_params;
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struct sockaddr_in6 *in6;
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u16 test_case, dst6[8];
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u16 test_case;
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int addrlen, ret;
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char fmt[] = "Failed at stress_lru_hmap_alloc. ret:%d\n";
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long val = 1;
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u32 key = bpf_get_prandom_u32();
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u32 key = 0;
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in6 = (struct sockaddr_in6 *)PT_REGS_PARM2(ctx);
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addrlen = (int)PT_REGS_PARM3(ctx);
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@ -161,14 +179,18 @@ int stress_lru_hmap_alloc(struct pt_regs *ctx)
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if (addrlen != sizeof(*in6))
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return 0;
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ret = bpf_probe_read(dst6, sizeof(dst6), &in6->sin6_addr);
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ret = bpf_probe_read(test_params.dst6, sizeof(test_params.dst6),
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&in6->sin6_addr);
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if (ret)
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goto done;
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if (dst6[0] != 0xdead || dst6[1] != 0xbeef)
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if (test_params.magic0 != 0xdead ||
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test_params.magic1 != 0xbeef)
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return 0;
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test_case = dst6[7];
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test_case = test_params.tcase;
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if (test_case != 3)
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key = bpf_get_prandom_u32();
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if (test_case == 0) {
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ret = bpf_map_update_elem(&lru_hash_map, &key, &val, BPF_ANY);
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@ -188,6 +210,16 @@ int stress_lru_hmap_alloc(struct pt_regs *ctx)
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ret = bpf_map_update_elem(nolocal_lru_map, &key, &val,
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BPF_ANY);
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} else if (test_case == 3) {
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u32 i;
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key = test_params.key;
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#pragma clang loop unroll(full)
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for (i = 0; i < 32; i++) {
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bpf_map_lookup_elem(&lru_hash_lookup_map, &key);
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key++;
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}
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} else {
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ret = -EINVAL;
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}
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@ -46,6 +46,7 @@ enum test_type {
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HASH_LOOKUP,
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ARRAY_LOOKUP,
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INNER_LRU_HASH_PREALLOC,
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LRU_HASH_LOOKUP,
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NR_TESTS,
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};
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@ -60,6 +61,7 @@ const char *test_map_names[NR_TESTS] = {
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[HASH_LOOKUP] = "hash_map",
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[ARRAY_LOOKUP] = "array_map",
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[INNER_LRU_HASH_PREALLOC] = "inner_lru_hash_map",
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[LRU_HASH_LOOKUP] = "lru_hash_lookup_map",
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};
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static int test_flags = ~0;
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@ -67,6 +69,8 @@ static uint32_t num_map_entries;
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static uint32_t inner_lru_hash_size;
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static int inner_lru_hash_idx = -1;
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static int array_of_lru_hashs_idx = -1;
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static int lru_hash_lookup_idx = -1;
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static int lru_hash_lookup_test_entries = 32;
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static uint32_t max_cnt = 1000000;
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static int check_test_flags(enum test_type t)
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@ -86,6 +90,32 @@ static void test_hash_prealloc(int cpu)
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cpu, max_cnt * 1000000000ll / (time_get_ns() - start_time));
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}
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static int pre_test_lru_hash_lookup(int tasks)
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{
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int fd = map_fd[lru_hash_lookup_idx];
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uint32_t key;
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long val = 1;
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int ret;
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if (num_map_entries > lru_hash_lookup_test_entries)
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lru_hash_lookup_test_entries = num_map_entries;
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/* Populate the lru_hash_map for LRU_HASH_LOOKUP perf test.
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*
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* It is fine that the user requests for a map with
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* num_map_entries < 32 and some of the later lru hash lookup
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* may return not found. For LRU map, we are not interested
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* in such small map performance.
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*/
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for (key = 0; key < lru_hash_lookup_test_entries; key++) {
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ret = bpf_map_update_elem(fd, &key, &val, BPF_NOEXIST);
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if (ret)
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return ret;
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}
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return 0;
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}
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static void do_test_lru(enum test_type test, int cpu)
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{
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static int inner_lru_map_fds[MAX_NR_CPUS];
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@ -135,13 +165,17 @@ static void do_test_lru(enum test_type test, int cpu)
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if (test == LRU_HASH_PREALLOC) {
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test_name = "lru_hash_map_perf";
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in6.sin6_addr.s6_addr16[7] = 0;
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in6.sin6_addr.s6_addr16[2] = 0;
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} else if (test == NOCOMMON_LRU_HASH_PREALLOC) {
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test_name = "nocommon_lru_hash_map_perf";
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in6.sin6_addr.s6_addr16[7] = 1;
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in6.sin6_addr.s6_addr16[2] = 1;
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} else if (test == INNER_LRU_HASH_PREALLOC) {
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test_name = "inner_lru_hash_map_perf";
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in6.sin6_addr.s6_addr16[7] = 2;
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in6.sin6_addr.s6_addr16[2] = 2;
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} else if (test == LRU_HASH_LOOKUP) {
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test_name = "lru_hash_lookup_perf";
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in6.sin6_addr.s6_addr16[2] = 3;
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in6.sin6_addr.s6_addr32[3] = 0;
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} else {
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assert(0);
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}
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@ -150,6 +184,11 @@ static void do_test_lru(enum test_type test, int cpu)
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for (i = 0; i < max_cnt; i++) {
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ret = connect(-1, (const struct sockaddr *)&in6, sizeof(in6));
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assert(ret == -1 && errno == EBADF);
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if (in6.sin6_addr.s6_addr32[3] <
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lru_hash_lookup_test_entries - 32)
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in6.sin6_addr.s6_addr32[3] += 32;
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else
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in6.sin6_addr.s6_addr32[3] = 0;
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}
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printf("%d:%s pre-alloc %lld events per sec\n",
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cpu, test_name,
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@ -171,6 +210,11 @@ static void test_inner_lru_hash_prealloc(int cpu)
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do_test_lru(INNER_LRU_HASH_PREALLOC, cpu);
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}
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static void test_lru_hash_lookup(int cpu)
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{
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do_test_lru(LRU_HASH_LOOKUP, cpu);
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}
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static void test_percpu_hash_prealloc(int cpu)
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{
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__u64 start_time;
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@ -243,6 +287,11 @@ static void test_array_lookup(int cpu)
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cpu, max_cnt * 1000000000ll * 64 / (time_get_ns() - start_time));
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}
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typedef int (*pre_test_func)(int tasks);
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const pre_test_func pre_test_funcs[] = {
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[LRU_HASH_LOOKUP] = pre_test_lru_hash_lookup,
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};
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typedef void (*test_func)(int cpu);
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const test_func test_funcs[] = {
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[HASH_PREALLOC] = test_hash_prealloc,
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@ -255,8 +304,25 @@ const test_func test_funcs[] = {
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[HASH_LOOKUP] = test_hash_lookup,
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[ARRAY_LOOKUP] = test_array_lookup,
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[INNER_LRU_HASH_PREALLOC] = test_inner_lru_hash_prealloc,
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[LRU_HASH_LOOKUP] = test_lru_hash_lookup,
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};
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static int pre_test(int tasks)
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{
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int i;
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for (i = 0; i < NR_TESTS; i++) {
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if (pre_test_funcs[i] && check_test_flags(i)) {
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int ret = pre_test_funcs[i](tasks);
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if (ret)
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return ret;
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}
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}
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return 0;
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}
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static void loop(int cpu)
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{
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cpu_set_t cpuset;
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@ -277,6 +343,8 @@ static void run_perf_test(int tasks)
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pid_t pid[tasks];
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int i;
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assert(!pre_test(tasks));
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for (i = 0; i < tasks; i++) {
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pid[i] = fork();
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if (pid[i] == 0) {
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@ -344,6 +412,9 @@ static void fixup_map(struct bpf_map_data *map, int idx)
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array_of_lru_hashs_idx = idx;
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}
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if (!strcmp("lru_hash_lookup_map", map->name))
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lru_hash_lookup_idx = idx;
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if (num_map_entries <= 0)
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return;
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