150 lines
3.0 KiB
C
150 lines
3.0 KiB
C
/*
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*
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* syscall.c
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*
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* syscall: Benchmark for system call performance
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*/
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#include "../perf.h"
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#include "../util/util.h"
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#include <subcmd/parse-options.h>
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#include "../builtin.h"
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#include "bench.h"
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#include <stdio.h>
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#include <sys/time.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <stdlib.h>
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#define LOOPS_DEFAULT 10000000
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static int loops = LOOPS_DEFAULT;
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static const struct option options[] = {
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OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
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OPT_END()
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};
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static const char * const bench_syscall_usage[] = {
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"perf bench syscall <options>",
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NULL
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};
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static void test_execve(void)
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{
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const char *pathname = "/bin/true";
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char *const argv[] = { (char *)pathname, NULL };
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pid_t pid = fork();
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if (pid < 0) {
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fprintf(stderr, "fork failed\n");
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exit(1);
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} else if (pid == 0) {
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execve(pathname, argv, NULL);
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fprintf(stderr, "execve /bin/true failed\n");
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exit(1);
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} else {
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if (waitpid(pid, NULL, 0) < 0) {
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fprintf(stderr, "waitpid failed\n");
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exit(1);
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}
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}
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}
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static int bench_syscall_common(int argc, const char **argv, int syscall)
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{
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struct timeval start, stop, diff;
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unsigned long long result_usec = 0;
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const char *name = NULL;
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int i;
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argc = parse_options(argc, argv, options, bench_syscall_usage, 0);
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gettimeofday(&start, NULL);
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for (i = 0; i < loops; i++) {
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switch (syscall) {
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case __NR_getppid:
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getppid();
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break;
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case __NR_getpgid:
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getpgid(0);
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break;
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case __NR_execve:
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test_execve();
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/* Only loop 10000 times to save time */
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if (i == 10000)
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loops = 10000;
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break;
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default:
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break;
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}
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}
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gettimeofday(&stop, NULL);
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timersub(&stop, &start, &diff);
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switch (syscall) {
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case __NR_getppid:
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name = "getppid()";
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break;
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case __NR_getpgid:
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name = "getpgid()";
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break;
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case __NR_execve:
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name = "execve()";
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break;
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default:
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break;
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}
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switch (bench_format) {
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case BENCH_FORMAT_DEFAULT:
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printf("# Executed %'d %s calls\n", loops, name);
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result_usec = diff.tv_sec * 1000000;
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result_usec += diff.tv_usec;
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printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
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(unsigned long) diff.tv_sec,
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(unsigned long) (diff.tv_usec/1000));
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printf(" %14lf usecs/op\n",
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(double)result_usec / (double)loops);
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printf(" %'14d ops/sec\n",
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(int)((double)loops /
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((double)result_usec / (double)1000000)));
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break;
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case BENCH_FORMAT_SIMPLE:
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printf("%lu.%03lu\n",
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(unsigned long) diff.tv_sec,
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(unsigned long) (diff.tv_usec / 1000));
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break;
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default:
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/* reaching here is something disaster */
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fprintf(stderr, "Unknown format:%d\n", bench_format);
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exit(1);
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break;
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}
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return 0;
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}
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int bench_syscall_basic(int argc, const char **argv)
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{
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return bench_syscall_common(argc, argv, __NR_getppid);
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}
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int bench_syscall_getpgid(int argc, const char **argv)
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{
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return bench_syscall_common(argc, argv, __NR_getpgid);
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}
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int bench_syscall_execve(int argc, const char **argv)
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{
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return bench_syscall_common(argc, argv, __NR_execve);
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}
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