1// SPDX-License-Identifier: GPL-2.0-only
  2/* Copyright (c) 2016 Facebook
  3 */
  4#define _GNU_SOURCE
  5#include <sched.h>
  6#include <errno.h>
  7#include <stdio.h>
  8#include <sys/types.h>
  9#include <asm/unistd.h>
 10#include <fcntl.h>
 11#include <unistd.h>
 12#include <assert.h>
 13#include <sys/wait.h>
 14#include <stdlib.h>
 15#include <signal.h>
 16#include <linux/bpf.h>
 17#include <string.h>
 18#include <time.h>
 19#include <sys/resource.h>
 20#include <bpf/bpf.h>
 21#include "bpf_load.h"
 22
 23#define MAX_CNT 1000000
 24
 25static __u64 time_get_ns(void)
 26{
 27	struct timespec ts;
 28
 29	clock_gettime(CLOCK_MONOTONIC, &ts);
 30	return ts.tv_sec * 1000000000ull + ts.tv_nsec;
 31}
 32
 33static void test_task_rename(int cpu)
 34{
 35	__u64 start_time;
 36	char buf[] = "test\n";
 37	int i, fd;
 38
 39	fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
 40	if (fd < 0) {
 41		printf("couldn't open /proc\n");
 42		exit(1);
 43	}
 44	start_time = time_get_ns();
 45	for (i = 0; i < MAX_CNT; i++) {
 46		if (write(fd, buf, sizeof(buf)) < 0) {
 47			printf("task rename failed: %s\n", strerror(errno));
 48			close(fd);
 49			return;
 50		}
 51	}
 52	printf("task_rename:%d: %lld events per sec\n",
 53	       cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
 54	close(fd);
 55}
 56
 57static void test_urandom_read(int cpu)
 58{
 59	__u64 start_time;
 60	char buf[4];
 61	int i, fd;
 62
 63	fd = open("/dev/urandom", O_RDONLY);
 64	if (fd < 0) {
 65		printf("couldn't open /dev/urandom\n");
 66		exit(1);
 67	}
 68	start_time = time_get_ns();
 69	for (i = 0; i < MAX_CNT; i++) {
 70		if (read(fd, buf, sizeof(buf)) < 0) {
 71			printf("failed to read from /dev/urandom: %s\n", strerror(errno));
 72			close(fd);
 73			return;
 74		}
 75	}
 76	printf("urandom_read:%d: %lld events per sec\n",
 77	       cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
 78	close(fd);
 79}
 80
 81static void loop(int cpu, int flags)
 82{
 83	cpu_set_t cpuset;
 84
 85	CPU_ZERO(&cpuset);
 86	CPU_SET(cpu, &cpuset);
 87	sched_setaffinity(0, sizeof(cpuset), &cpuset);
 88
 89	if (flags & 1)
 90		test_task_rename(cpu);
 91	if (flags & 2)
 92		test_urandom_read(cpu);
 93}
 94
 95static void run_perf_test(int tasks, int flags)
 96{
 97	pid_t pid[tasks];
 98	int i;
 99
100	for (i = 0; i < tasks; i++) {
101		pid[i] = fork();
102		if (pid[i] == 0) {
103			loop(i, flags);
104			exit(0);
105		} else if (pid[i] == -1) {
106			printf("couldn't spawn #%d process\n", i);
107			exit(1);
108		}
109	}
110	for (i = 0; i < tasks; i++) {
111		int status;
112
113		assert(waitpid(pid[i], &status, 0) == pid[i]);
114		assert(status == 0);
115	}
116}
117
118static void unload_progs(void)
119{
120	close(prog_fd[0]);
121	close(prog_fd[1]);
122	close(event_fd[0]);
123	close(event_fd[1]);
124}
125
126int main(int argc, char **argv)
127{
128	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
129	char filename[256];
130	int num_cpu = 8;
131	int test_flags = ~0;
132
133	setrlimit(RLIMIT_MEMLOCK, &r);
134
135	if (argc > 1)
136		test_flags = atoi(argv[1]) ? : test_flags;
137	if (argc > 2)
138		num_cpu = atoi(argv[2]) ? : num_cpu;
139
140	if (test_flags & 0x3) {
141		printf("BASE\n");
142		run_perf_test(num_cpu, test_flags);
143	}
144
145	if (test_flags & 0xC) {
146		snprintf(filename, sizeof(filename),
147			 "%s_kprobe_kern.o", argv[0]);
148		if (load_bpf_file(filename)) {
149			printf("%s", bpf_log_buf);
150			return 1;
151		}
152		printf("w/KPROBE\n");
153		run_perf_test(num_cpu, test_flags >> 2);
154		unload_progs();
155	}
156
157	if (test_flags & 0x30) {
158		snprintf(filename, sizeof(filename),
159			 "%s_tp_kern.o", argv[0]);
160		if (load_bpf_file(filename)) {
161			printf("%s", bpf_log_buf);
162			return 1;
163		}
164		printf("w/TRACEPOINT\n");
165		run_perf_test(num_cpu, test_flags >> 4);
166		unload_progs();
167	}
168
169	if (test_flags & 0xC0) {
170		snprintf(filename, sizeof(filename),
171			 "%s_raw_tp_kern.o", argv[0]);
172		if (load_bpf_file(filename)) {
173			printf("%s", bpf_log_buf);
174			return 1;
175		}
176		printf("w/RAW_TRACEPOINT\n");
177		run_perf_test(num_cpu, test_flags >> 6);
178		unload_progs();
179	}
180
181	return 0;
182}