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Commit bf8db5d2 authored by Martin KaFai Lau's avatar Martin KaFai Lau Committed by David S. Miller
Browse files

bpf: lru: Refactor LRU map tests in map_perf_test 



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: default avatarMartin KaFai Lau <kafai@fb.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6467acbc

samples/bpf/map_perf_test_kern.c

+31 −12
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ struct bpf_map_def SEC("maps") lru_hash_map = { 
	.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,

	.key_size = sizeof(u32),

	.value_size = sizeof(long),
@@ -100,6 +100,7 @@ int stress_percpu_hmap(struct pt_regs *ctx) 
		bpf_map_delete_elem(&percpu_hash_map, &key);

	return 0;

}



SEC("kprobe/sys_getgid")

int stress_hmap_alloc(struct pt_regs *ctx)

{
@@ -128,24 +129,42 @@ int stress_percpu_hmap_alloc(struct pt_regs *ctx) 
	return 0;

}



SEC("kprobe/sys_getpid")

SEC("kprobe/sys_connect")

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;

	u32 key = bpf_get_prandom_u32();



	bpf_map_update_elem(&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;

}



SEC("kprobe/sys_getppid")

int stress_percpu_lru_hmap_alloc(struct pt_regs *ctx)

{

	u32 key = bpf_get_prandom_u32();

	long val = 1;

	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;



	bpf_map_update_elem(&percpu_lru_hash_map, &key, &val, BPF_ANY);

done:

	if (ret)

		bpf_trace_printk(fmt, sizeof(fmt), ret);



	return 0;

}

samples/bpf/map_perf_test_user.c

+36 −17
Original line number Diff line number Diff line
@@ -18,6 +18,9 @@ 
#include <string.h>

#include <time.h>

#include <sys/resource.h>

#include <arpa/inet.h>

#include <errno.h>



#include "libbpf.h"

#include "bpf_load.h"
@@ -36,7 +39,7 @@ static __u64 time_get_ns(void) 
#define HASH_KMALLOC		(1 << 2)

#define PERCPU_HASH_KMALLOC	(1 << 3)

#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 HASH_LOOKUP		(1 << 7)

#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));

}



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;

	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();

	for (i = 0; i < MAX_CNT; i++)

		syscall(__NR_getpid);

	printf("%d:lru_hash_map_perf pre-alloc %lld events per sec\n",

	       cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));

	for (i = 0; i < MAX_CNT; i++) {

		ret = connect(-1, (const struct sockaddr *)&in6, sizeof(in6));

		assert(ret == -1 && errno == EBADF);

	}

	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;

	int i;

	do_test_lru(LRU_HASH_PREALLOC, cpu);

}



	start_time = time_get_ns();

	for (i = 0; i < MAX_CNT; i++)

		syscall(__NR_getppid);

	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_nocommon_lru_hash_prealloc(int cpu)

{

	do_test_lru(NOCOMMON_LRU_HASH_PREALLOC, cpu);

}



static void test_percpu_hash_prealloc(int cpu)
@@ -174,8 +193,8 @@ static void loop(int cpu) 
	if (test_flags & LRU_HASH_PREALLOC)

		test_lru_hash_prealloc(cpu);



	if (test_flags & PERCPU_LRU_HASH_PREALLOC)

		test_percpu_lru_hash_prealloc(cpu);

	if (test_flags & NOCOMMON_LRU_HASH_PREALLOC)

		test_nocommon_lru_hash_prealloc(cpu);



	if (test_flags & LPM_KMALLOC)

		test_lpm_kmalloc(cpu);