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Commit 26e90931 authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by David S. Miller
Browse files

samples/bpf: add map performance test 



performance tests for hash map and per-cpu hash map
with and without pre-allocation

Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7dcc42b6

samples/bpf/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ hostprogs-y += trace_output 
hostprogs-y += lathist

hostprogs-y += offwaketime

hostprogs-y += spintest

hostprogs-y += map_perf_test



test_verifier-objs := test_verifier.o libbpf.o

test_maps-objs := test_maps.o libbpf.o
@@ -36,6 +37,7 @@ trace_output-objs := bpf_load.o libbpf.o trace_output_user.o 
lathist-objs := bpf_load.o libbpf.o lathist_user.o

offwaketime-objs := bpf_load.o libbpf.o offwaketime_user.o

spintest-objs := bpf_load.o libbpf.o spintest_user.o

map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o



# Tell kbuild to always build the programs

always := $(hostprogs-y)
@@ -53,6 +55,7 @@ always += tcbpf1_kern.o 
always += lathist_kern.o

always += offwaketime_kern.o

always += spintest_kern.o

always += map_perf_test_kern.o



HOSTCFLAGS += -I$(objtree)/usr/include
@@ -71,6 +74,7 @@ HOSTLOADLIBES_trace_output += -lelf -lrt 
HOSTLOADLIBES_lathist += -lelf

HOSTLOADLIBES_offwaketime += -lelf

HOSTLOADLIBES_spintest += -lelf

HOSTLOADLIBES_map_perf_test += -lelf -lrt



# point this to your LLVM backend with bpf support

LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc

samples/bpf/map_perf_test_kern.c

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+100 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2016 Facebook

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of version 2 of the GNU General Public

 * License as published by the Free Software Foundation.

 */

#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/version.h>

#include <uapi/linux/bpf.h>

#include "bpf_helpers.h"



#define MAX_ENTRIES 1000



struct bpf_map_def SEC("maps") hash_map = {

	.type = BPF_MAP_TYPE_HASH,

	.key_size = sizeof(u32),

	.value_size = sizeof(long),

	.max_entries = MAX_ENTRIES,

};



struct bpf_map_def SEC("maps") percpu_hash_map = {

	.type = BPF_MAP_TYPE_PERCPU_HASH,

	.key_size = sizeof(u32),

	.value_size = sizeof(long),

	.max_entries = MAX_ENTRIES,

};



struct bpf_map_def SEC("maps") hash_map_alloc = {

	.type = BPF_MAP_TYPE_HASH,

	.key_size = sizeof(u32),

	.value_size = sizeof(long),

	.max_entries = MAX_ENTRIES,

	.map_flags = BPF_F_NO_PREALLOC,

};



struct bpf_map_def SEC("maps") percpu_hash_map_alloc = {

	.type = BPF_MAP_TYPE_PERCPU_HASH,

	.key_size = sizeof(u32),

	.value_size = sizeof(long),

	.max_entries = MAX_ENTRIES,

	.map_flags = BPF_F_NO_PREALLOC,

};



SEC("kprobe/sys_getuid")

int stress_hmap(struct pt_regs *ctx)

{

	u32 key = bpf_get_current_pid_tgid();

	long init_val = 1;

	long *value;



	bpf_map_update_elem(&hash_map, &key, &init_val, BPF_ANY);

	value = bpf_map_lookup_elem(&hash_map, &key);

	if (value)

		bpf_map_delete_elem(&hash_map, &key);

	return 0;

}



SEC("kprobe/sys_geteuid")

int stress_percpu_hmap(struct pt_regs *ctx)

{

	u32 key = bpf_get_current_pid_tgid();

	long init_val = 1;

	long *value;



	bpf_map_update_elem(&percpu_hash_map, &key, &init_val, BPF_ANY);

	value = bpf_map_lookup_elem(&percpu_hash_map, &key);

	if (value)

		bpf_map_delete_elem(&percpu_hash_map, &key);

	return 0;

}

SEC("kprobe/sys_getgid")

int stress_hmap_alloc(struct pt_regs *ctx)

{

	u32 key = bpf_get_current_pid_tgid();

	long init_val = 1;

	long *value;



	bpf_map_update_elem(&hash_map_alloc, &key, &init_val, BPF_ANY);

	value = bpf_map_lookup_elem(&hash_map_alloc, &key);

	if (value)

		bpf_map_delete_elem(&hash_map_alloc, &key);

	return 0;

}



SEC("kprobe/sys_getegid")

int stress_percpu_hmap_alloc(struct pt_regs *ctx)

{

	u32 key = bpf_get_current_pid_tgid();

	long init_val = 1;

	long *value;



	bpf_map_update_elem(&percpu_hash_map_alloc, &key, &init_val, BPF_ANY);

	value = bpf_map_lookup_elem(&percpu_hash_map_alloc, &key);

	if (value)

		bpf_map_delete_elem(&percpu_hash_map_alloc, &key);

	return 0;

}

char _license[] SEC("license") = "GPL";

u32 _version SEC("version") = LINUX_VERSION_CODE;

samples/bpf/map_perf_test_user.c

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+155 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2016 Facebook

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of version 2 of the GNU General Public

 * License as published by the Free Software Foundation.

 */

#define _GNU_SOURCE

#include <sched.h>

#include <stdio.h>

#include <sys/types.h>

#include <asm/unistd.h>

#include <unistd.h>

#include <assert.h>

#include <sys/wait.h>

#include <stdlib.h>

#include <signal.h>

#include <linux/bpf.h>

#include <string.h>

#include <time.h>

#include "libbpf.h"

#include "bpf_load.h"



#define MAX_CNT 1000000



static __u64 time_get_ns(void)

{

	struct timespec ts;



	clock_gettime(CLOCK_MONOTONIC, &ts);

	return ts.tv_sec * 1000000000ull + ts.tv_nsec;

}



#define HASH_PREALLOC		(1 << 0)

#define PERCPU_HASH_PREALLOC	(1 << 1)

#define HASH_KMALLOC		(1 << 2)

#define PERCPU_HASH_KMALLOC	(1 << 3)



static int test_flags = ~0;



static void test_hash_prealloc(int cpu)

{

	__u64 start_time;

	int i;



	start_time = time_get_ns();

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

		syscall(__NR_getuid);

	printf("%d: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)

{

	__u64 start_time;

	int i;



	start_time = time_get_ns();

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

		syscall(__NR_geteuid);

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

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

}



static void test_hash_kmalloc(int cpu)

{

	__u64 start_time;

	int i;



	start_time = time_get_ns();

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

		syscall(__NR_getgid);

	printf("%d:hash_map_perf kmalloc %lld events per sec\n",

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

}



static void test_percpu_hash_kmalloc(int cpu)

{

	__u64 start_time;

	int i;



	start_time = time_get_ns();

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

		syscall(__NR_getegid);

	printf("%d:percpu_hash_map_perf kmalloc %lld events per sec\n",

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

}



static void loop(int cpu)

{

	cpu_set_t cpuset;



	CPU_ZERO(&cpuset);

	CPU_SET(cpu, &cpuset);

	sched_setaffinity(0, sizeof(cpuset), &cpuset);



	if (test_flags & HASH_PREALLOC)

		test_hash_prealloc(cpu);



	if (test_flags & PERCPU_HASH_PREALLOC)

		test_percpu_hash_prealloc(cpu);



	if (test_flags & HASH_KMALLOC)

		test_hash_kmalloc(cpu);



	if (test_flags & PERCPU_HASH_KMALLOC)

		test_percpu_hash_kmalloc(cpu);

}



static void run_perf_test(int tasks)

{

	pid_t pid[tasks];

	int i;



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

		pid[i] = fork();

		if (pid[i] == 0) {

			loop(i);

			exit(0);

		} else if (pid[i] == -1) {

			printf("couldn't spawn #%d process\n", i);

			exit(1);

		}

	}

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

		int status;



		assert(waitpid(pid[i], &status, 0) == pid[i]);

		assert(status == 0);

	}

}



int main(int argc, char **argv)

{

	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};

	char filename[256];

	int num_cpu = 8;



	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

	setrlimit(RLIMIT_MEMLOCK, &r);



	if (argc > 1)

		test_flags = atoi(argv[1]) ? : test_flags;



	if (argc > 2)

		num_cpu = atoi(argv[2]) ? : num_cpu;



	if (load_bpf_file(filename)) {

		printf("%s", bpf_log_buf);

		return 1;

	}



	run_perf_test(num_cpu);



	return 0;

}