Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 215 insertions, 0 deletions

diff --git a/samples/bpf/test_overhead_user.c b/samples/bpf/test_overhead_user.c
new file mode 100644
index 000000000..88717f8ec
--- /dev/null
+++ b/samples/bpf/test_overhead_user.c
@@ -0,0 +1,215 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2016 Facebook
+ */
+#define _GNU_SOURCE
+#include <sched.h>
+#include <errno.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 <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#define MAX_CNT 1000000
+
+static struct bpf_link *links[2];
+static struct bpf_object *obj;
+static int cnt;
+
+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++) {
+		if (write(fd, buf, sizeof(buf)) < 0) {
+			printf("task rename failed: %s\n", strerror(errno));
+			close(fd);
+			return;
+		}
+	}
+	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++) {
+		if (read(fd, buf, sizeof(buf)) < 0) {
+			printf("failed to read from /dev/urandom: %s\n", strerror(errno));
+			close(fd);
+			return;
+		}
+	}
+	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 int load_progs(char *filename)
+{
+	struct bpf_program *prog;
+	int err = 0;
+
+	obj = bpf_object__open_file(filename, NULL);
+	err = libbpf_get_error(obj);
+	if (err < 0) {
+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
+		return err;
+	}
+
+	/* load BPF program */
+	err = bpf_object__load(obj);
+	if (err < 0) {
+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
+		return err;
+	}
+
+	bpf_object__for_each_program(prog, obj) {
+		links[cnt] = bpf_program__attach(prog);
+		err = libbpf_get_error(links[cnt]);
+		if (err < 0) {
+			fprintf(stderr, "ERROR: bpf_program__attach failed\n");
+			links[cnt] = NULL;
+			return err;
+		}
+		cnt++;
+	}
+
+	return err;
+}
+
+static void unload_progs(void)
+{
+	while (cnt)
+		bpf_link__destroy(links[--cnt]);
+
+	bpf_object__close(obj);
+}
+
+int main(int argc, char **argv)
+{
+	int num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
+	int test_flags = ~0;
+	char filename[256];
+	int err = 0;
+
+
+	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]);
+
+		printf("w/KPROBE\n");
+		err = load_progs(filename);
+		if (!err)
+			run_perf_test(num_cpu, test_flags >> 2);
+
+		unload_progs();
+	}
+
+	if (test_flags & 0x30) {
+		snprintf(filename, sizeof(filename),
+			 "%s_tp_kern.o", argv[0]);
+		printf("w/TRACEPOINT\n");
+		err = load_progs(filename);
+		if (!err)
+			run_perf_test(num_cpu, test_flags >> 4);
+
+		unload_progs();
+	}
+
+	if (test_flags & 0xC0) {
+		snprintf(filename, sizeof(filename),
+			 "%s_raw_tp_kern.o", argv[0]);
+		printf("w/RAW_TRACEPOINT\n");
+		err = load_progs(filename);
+		if (!err)
+			run_perf_test(num_cpu, test_flags >> 6);
+
+		unload_progs();
+	}
+
+	return err;
+}