samples/bpf: add tracepoint vs kprobe performance tests

the first microbenchmark does
fd=open("/proc/self/comm");
for() {
  write(fd, "test");
}
and on 4 cpus in parallel:
                                      writes per sec
base (no tracepoints, no kprobes)         930k
with kprobe at __set_task_comm()          420k
with tracepoint at task:task_rename       730k

For kprobe + full bpf program manully fetches oldcomm, newcomm via bpf_probe_read.
For tracepint bpf program does nothing, since arguments are copied by tracepoint.

2nd microbenchmark does:
fd=open("/dev/urandom");
for() {
  read(fd, buf);
}
and on 4 cpus in parallel:
                                       reads per sec
base (no tracepoints, no kprobes)         300k
with kprobe at urandom_read()             279k
with tracepoint at random:urandom_read    290k

bpf progs attached to kprobe and tracepoint are noop.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 162 insertions, 0 deletions

diff --git a/samples/bpf/test_overhead_user.c b/samples/bpf/test_overhead_user.c
new file mode 100644
index 000000000000..d291167fd3c7
--- /dev/null
+++ b/samples/bpf/test_overhead_user.c
@@ -0,0 +1,162 @@
+/* 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 <fcntl.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 <sys/resource.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;
+}
+
+static void test_task_rename(int cpu)
+{
+	__u64 start_time;
+	char buf[] = "test\n";
+	int i, fd;
+
+	fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
+	if (fd < 0) {
+		printf("couldn't open /proc\n");
+		exit(1);
+	}
+	start_time = time_get_ns();
+	for (i = 0; i < MAX_CNT; i++)
+		write(fd, buf, sizeof(buf));
+	printf("task_rename:%d: %lld events per sec\n",
+	       cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
+	close(fd);
+}
+
+static void test_urandom_read(int cpu)
+{
+	__u64 start_time;
+	char buf[4];
+	int i, fd;
+
+	fd = open("/dev/urandom", O_RDONLY);
+	if (fd < 0) {
+		printf("couldn't open /dev/urandom\n");
+		exit(1);
+	}
+	start_time = time_get_ns();
+	for (i = 0; i < MAX_CNT; i++)
+		read(fd, buf, sizeof(buf));
+	printf("urandom_read:%d: %lld events per sec\n",
+	       cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
+	close(fd);
+}
+
+static void loop(int cpu, int flags)
+{
+	cpu_set_t cpuset;
+
+	CPU_ZERO(&cpuset);
+	CPU_SET(cpu, &cpuset);
+	sched_setaffinity(0, sizeof(cpuset), &cpuset);
+
+	if (flags & 1)
+		test_task_rename(cpu);
+	if (flags & 2)
+		test_urandom_read(cpu);
+}
+
+static void run_perf_test(int tasks, int flags)
+{
+	pid_t pid[tasks];
+	int i;
+
+	for (i = 0; i < tasks; i++) {
+		pid[i] = fork();
+		if (pid[i] == 0) {
+			loop(i, flags);
+			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);
+	}
+}
+
+static void unload_progs(void)
+{
+	close(prog_fd[0]);
+	close(prog_fd[1]);
+	close(event_fd[0]);
+	close(event_fd[1]);
+}
+
+int main(int argc, char **argv)
+{
+	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+	char filename[256];
+	int num_cpu = 8;
+	int test_flags = ~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 (test_flags & 0x3) {
+		printf("BASE\n");
+		run_perf_test(num_cpu, test_flags);
+	}
+
+	if (test_flags & 0xC) {
+		snprintf(filename, sizeof(filename),
+			 "%s_kprobe_kern.o", argv[0]);
+		if (load_bpf_file(filename)) {
+			printf("%s", bpf_log_buf);
+			return 1;
+		}
+		printf("w/KPROBE\n");
+		run_perf_test(num_cpu, test_flags >> 2);
+		unload_progs();
+	}
+
+	if (test_flags & 0x30) {
+		snprintf(filename, sizeof(filename),
+			 "%s_tp_kern.o", argv[0]);
+		if (load_bpf_file(filename)) {
+			printf("%s", bpf_log_buf);
+			return 1;
+		}
+		printf("w/TRACEPOINT\n");
+		run_perf_test(num_cpu, test_flags >> 4);
+		unload_progs();
+	}
+
+	return 0;
+}