Commit dd40c5b4 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman

selftests/powerpc: Add process creation benchmark

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
[mpe: Add SPDX, and fixup formatting]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent a0828cf5
gettimeofday
context_switch
fork
exec_target
mmap_bench
futex_bench
null_syscall
# SPDX-License-Identifier: GPL-2.0
TEST_GEN_PROGS := gettimeofday context_switch mmap_bench futex_bench null_syscall
TEST_GEN_PROGS := gettimeofday context_switch fork mmap_bench futex_bench null_syscall
TEST_GEN_FILES := exec_target
CFLAGS += -O2
......@@ -10,3 +11,7 @@ $(TEST_GEN_PROGS): ../harness.c
$(OUTPUT)/context_switch: ../utils.c
$(OUTPUT)/context_switch: CFLAGS += -maltivec -mvsx -mabi=altivec
$(OUTPUT)/context_switch: LDLIBS += -lpthread
$(OUTPUT)/fork: LDLIBS += -lpthread
$(OUTPUT)/exec_target: CFLAGS += -static -nostartfiles
// SPDX-License-Identifier: GPL-2.0+
/*
* Part of fork context switch microbenchmark.
*
* Copyright 2018, Anton Blanchard, IBM Corp.
*/
void _exit(int);
void _start(void)
{
_exit(0);
}
// SPDX-License-Identifier: GPL-2.0+
/*
* Context switch microbenchmark.
*
* Copyright 2018, Anton Blanchard, IBM Corp.
*/
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <linux/futex.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/shm.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
static unsigned int timeout = 30;
static void set_cpu(int cpu)
{
cpu_set_t cpuset;
if (cpu == -1)
return;
CPU_ZERO(&cpuset);
CPU_SET(cpu, &cpuset);
if (sched_setaffinity(0, sizeof(cpuset), &cpuset)) {
perror("sched_setaffinity");
exit(1);
}
}
static void start_process_on(void *(*fn)(void *), void *arg, int cpu)
{
int pid;
pid = fork();
if (pid == -1) {
perror("fork");
exit(1);
}
if (pid)
return;
set_cpu(cpu);
fn(arg);
exit(0);
}
static int cpu;
static int do_fork = 0;
static int do_vfork = 0;
static int do_exec = 0;
static char *exec_file;
static int exec_target = 0;
static unsigned long iterations;
static unsigned long iterations_prev;
static void run_exec(void)
{
char *const argv[] = { "./exec_target", NULL };
if (execve("./exec_target", argv, NULL) == -1) {
perror("execve");
exit(1);
}
}
static void bench_fork(void)
{
while (1) {
pid_t pid = fork();
if (pid == -1) {
perror("fork");
exit(1);
}
if (pid == 0) {
if (do_exec)
run_exec();
_exit(0);
}
pid = waitpid(pid, NULL, 0);
if (pid == -1) {
perror("waitpid");
exit(1);
}
iterations++;
}
}
static void bench_vfork(void)
{
while (1) {
pid_t pid = vfork();
if (pid == -1) {
perror("fork");
exit(1);
}
if (pid == 0) {
if (do_exec)
run_exec();
_exit(0);
}
pid = waitpid(pid, NULL, 0);
if (pid == -1) {
perror("waitpid");
exit(1);
}
iterations++;
}
}
static void *null_fn(void *arg)
{
pthread_exit(NULL);
}
static void bench_thread(void)
{
pthread_t tid;
cpu_set_t cpuset;
pthread_attr_t attr;
int rc;
rc = pthread_attr_init(&attr);
if (rc) {
errno = rc;
perror("pthread_attr_init");
exit(1);
}
if (cpu != -1) {
CPU_ZERO(&cpuset);
CPU_SET(cpu, &cpuset);
rc = pthread_attr_setaffinity_np(&attr, sizeof(cpu_set_t), &cpuset);
if (rc) {
errno = rc;
perror("pthread_attr_setaffinity_np");
exit(1);
}
}
while (1) {
rc = pthread_create(&tid, &attr, null_fn, NULL);
if (rc) {
errno = rc;
perror("pthread_create");
exit(1);
}
rc = pthread_join(tid, NULL);
if (rc) {
errno = rc;
perror("pthread_join");
exit(1);
}
iterations++;
}
}
static void sigalrm_handler(int junk)
{
unsigned long i = iterations;
printf("%ld\n", i - iterations_prev);
iterations_prev = i;
if (--timeout == 0)
kill(0, SIGUSR1);
alarm(1);
}
static void sigusr1_handler(int junk)
{
exit(0);
}
static void *bench_proc(void *arg)
{
signal(SIGALRM, sigalrm_handler);
alarm(1);
if (do_fork)
bench_fork();
else if (do_vfork)
bench_vfork();
else
bench_thread();
return NULL;
}
static struct option options[] = {
{ "fork", no_argument, &do_fork, 1 },
{ "vfork", no_argument, &do_vfork, 1 },
{ "exec", no_argument, &do_exec, 1 },
{ "timeout", required_argument, 0, 's' },
{ "exec-target", no_argument, &exec_target, 1 },
{ NULL },
};
static void usage(void)
{
fprintf(stderr, "Usage: fork <options> CPU\n\n");
fprintf(stderr, "\t\t--fork\tUse fork() (default threads)\n");
fprintf(stderr, "\t\t--vfork\tUse vfork() (default threads)\n");
fprintf(stderr, "\t\t--exec\tAlso exec() (default no exec)\n");
fprintf(stderr, "\t\t--timeout=X\tDuration in seconds to run (default 30)\n");
fprintf(stderr, "\t\t--exec-target\tInternal option for exec workload\n");
}
int main(int argc, char *argv[])
{
signed char c;
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "", options, &option_index);
if (c == -1)
break;
switch (c) {
case 0:
if (options[option_index].flag != 0)
break;
usage();
exit(1);
break;
case 's':
timeout = atoi(optarg);
break;
default:
usage();
exit(1);
}
}
if (do_fork && do_vfork) {
usage();
exit(1);
}
if (do_exec && !do_fork && !do_vfork) {
usage();
exit(1);
}
if (do_exec) {
char *dirname = strdup(argv[0]);
int i;
i = strlen(dirname) - 1;
while (i) {
if (dirname[i] == '/') {
dirname[i] = '\0';
if (chdir(dirname) == -1) {
perror("chdir");
exit(1);
}
break;
}
i--;
}
}
if (exec_target) {
exit(0);
}
if (((argc - optind) != 1)) {
cpu = -1;
} else {
cpu = atoi(argv[optind++]);
}
if (do_exec)
exec_file = argv[0];
set_cpu(cpu);
printf("Using ");
if (do_fork)
printf("fork");
else if (do_vfork)
printf("vfork");
else
printf("clone");
if (do_exec)
printf(" + exec");
printf(" on cpu %d\n", cpu);
/* Create a new process group so we can signal everyone for exit */
setpgid(getpid(), getpid());
signal(SIGUSR1, sigusr1_handler);
start_process_on(bench_proc, NULL, cpu);
while (1)
sleep(3600);
return 0;
}
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