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bpf: lru: Refactor LRU map tests in map_perf_test

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One more LRU test will be added later in this patch series.
In this patch, we first move all existing LRU map tests into
a single syscall (connect) first so that the future new
LRU test can be added without hunting another syscall.

One of the map name is also changed from percpu_lru_hash_map
to nocommon_lru_hash_map to avoid the confusion with percpu_hash_map.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2017-04-14 10:30:27 -07:00 committed by David S. Miller
parent 6467acbc70
commit bf8db5d243
2 changed files with 69 additions and 31 deletions
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47
samples/bpf/map_perf_test_kern.c
View File

@ -26,7 +26,7 @@ struct bpf_map_def SEC("maps") lru_hash_map = {
.max_entries = 10000, .max_entries = 10000,
}; };
struct bpf_map_def SEC("maps") percpu_lru_hash_map = { struct bpf_map_def SEC("maps") nocommon_lru_hash_map = {
.type = BPF_MAP_TYPE_LRU_HASH, .type = BPF_MAP_TYPE_LRU_HASH,
.key_size = sizeof(u32), .key_size = sizeof(u32),
.value_size = sizeof(long), .value_size = sizeof(long),
@ -100,6 +100,7 @@ int stress_percpu_hmap(struct pt_regs *ctx)
bpf_map_delete_elem(&percpu_hash_map, &key); bpf_map_delete_elem(&percpu_hash_map, &key);
return 0; return 0;
} }
SEC("kprobe/sys_getgid") SEC("kprobe/sys_getgid")
int stress_hmap_alloc(struct pt_regs *ctx) int stress_hmap_alloc(struct pt_regs *ctx)
{ {
@ -128,24 +129,42 @@ int stress_percpu_hmap_alloc(struct pt_regs *ctx)
return 0; return 0;
} }
SEC("kprobe/sys_getpid") SEC("kprobe/sys_connect")
int stress_lru_hmap_alloc(struct pt_regs *ctx) int stress_lru_hmap_alloc(struct pt_regs *ctx)
{ {
u32 key = bpf_get_prandom_u32(); struct sockaddr_in6 *in6;
u16 test_case, dst6[8];
int addrlen, ret;
char fmt[] = "Failed at stress_lru_hmap_alloc. ret:%d\n";
long val = 1; long val = 1;
bpf_map_update_elem(&lru_hash_map, &key, &val, BPF_ANY);
return 0;
}
SEC("kprobe/sys_getppid")
int stress_percpu_lru_hmap_alloc(struct pt_regs *ctx)
{
u32 key = bpf_get_prandom_u32(); u32 key = bpf_get_prandom_u32();
long val = 1;
bpf_map_update_elem(&percpu_lru_hash_map, &key, &val, BPF_ANY); in6 = (struct sockaddr_in6 *)PT_REGS_PARM2(ctx);
addrlen = (int)PT_REGS_PARM3(ctx);
if (addrlen != sizeof(*in6))
return 0;
ret = bpf_probe_read(dst6, sizeof(dst6), &in6->sin6_addr);
if (ret)
goto done;
if (dst6[0] != 0xdead || dst6[1] != 0xbeef)
return 0;
test_case = dst6[7];
if (test_case == 0)
ret = bpf_map_update_elem(&lru_hash_map, &key, &val, BPF_ANY);
else if (test_case == 1)
ret = bpf_map_update_elem(&nocommon_lru_hash_map, &key, &val,
BPF_ANY);
else
ret = -EINVAL;
done:
if (ret)
bpf_trace_printk(fmt, sizeof(fmt), ret);
return 0; return 0;
} }

53
samples/bpf/map_perf_test_user.c
View File

@ -18,6 +18,9 @@
#include <string.h> #include <string.h>
#include <time.h> #include <time.h>
#include <sys/resource.h> #include <sys/resource.h>
#include <arpa/inet.h>
#include <errno.h>
#include "libbpf.h" #include "libbpf.h"
#include "bpf_load.h" #include "bpf_load.h"
@ -36,7 +39,7 @@ static __u64 time_get_ns(void)
#define HASH_KMALLOC (1 << 2) #define HASH_KMALLOC (1 << 2)
#define PERCPU_HASH_KMALLOC (1 << 3) #define PERCPU_HASH_KMALLOC (1 << 3)
#define LRU_HASH_PREALLOC (1 << 4) #define LRU_HASH_PREALLOC (1 << 4)
#define PERCPU_LRU_HASH_PREALLOC (1 << 5) #define NOCOMMON_LRU_HASH_PREALLOC (1 << 5)
#define LPM_KMALLOC (1 << 6) #define LPM_KMALLOC (1 << 6)
#define HASH_LOOKUP (1 << 7) #define HASH_LOOKUP (1 << 7)
#define ARRAY_LOOKUP (1 << 8) #define ARRAY_LOOKUP (1 << 8)
@ -55,28 +58,44 @@ static void test_hash_prealloc(int cpu)
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
} }
static void test_lru_hash_prealloc(int cpu) static void do_test_lru(int lru_test_flag, int cpu)
{ {
struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
const char *test_name;
__u64 start_time; __u64 start_time;
int i; int i, ret;
in6.sin6_addr.s6_addr16[0] = 0xdead;
in6.sin6_addr.s6_addr16[1] = 0xbeef;
if (lru_test_flag & LRU_HASH_PREALLOC) {
test_name = "lru_hash_map_perf";
in6.sin6_addr.s6_addr16[7] = 0;
} else if (lru_test_flag & NOCOMMON_LRU_HASH_PREALLOC) {
test_name = "nocommon_lru_hash_map_perf";
in6.sin6_addr.s6_addr16[7] = 1;
} else {
assert(0);
}
start_time = time_get_ns(); start_time = time_get_ns();
for (i = 0; i < MAX_CNT; i++) for (i = 0; i < MAX_CNT; i++) {
syscall(__NR_getpid); ret = connect(-1, (const struct sockaddr *)&in6, sizeof(in6));
printf("%d:lru_hash_map_perf pre-alloc %lld events per sec\n", assert(ret == -1 && errno == EBADF);
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); }
printf("%d:%s pre-alloc %lld events per sec\n",
cpu, test_name,
MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
} }
static void test_percpu_lru_hash_prealloc(int cpu) static void test_lru_hash_prealloc(int cpu)
{ {
__u64 start_time; do_test_lru(LRU_HASH_PREALLOC, cpu);
int i; }
start_time = time_get_ns(); static void test_nocommon_lru_hash_prealloc(int cpu)
for (i = 0; i < MAX_CNT; i++) {
syscall(__NR_getppid); do_test_lru(NOCOMMON_LRU_HASH_PREALLOC, cpu);
printf("%d:lru_hash_map_perf pre-alloc %lld events per sec\n",
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
} }
static void test_percpu_hash_prealloc(int cpu) static void test_percpu_hash_prealloc(int cpu)
@ -174,8 +193,8 @@ static void loop(int cpu)
if (test_flags & LRU_HASH_PREALLOC) if (test_flags & LRU_HASH_PREALLOC)
test_lru_hash_prealloc(cpu); test_lru_hash_prealloc(cpu);
if (test_flags & PERCPU_LRU_HASH_PREALLOC) if (test_flags & NOCOMMON_LRU_HASH_PREALLOC)
test_percpu_lru_hash_prealloc(cpu); test_nocommon_lru_hash_prealloc(cpu);
if (test_flags & LPM_KMALLOC) if (test_flags & LPM_KMALLOC)
test_lpm_kmalloc(cpu); test_lpm_kmalloc(cpu);