1/*
 2 *
 3 * syscall.c
 4 *
 5 * syscall: Benchmark for system call performance
 6 */
 7#include "../perf.h"
 8#include "../util/util.h"
 9#include <subcmd/parse-options.h>
10#include "../builtin.h"
11#include "bench.h"
12
13#include <stdio.h>
14#include <sys/time.h>
15#include <sys/syscall.h>
16#include <sys/types.h>
17#include <unistd.h>
18#include <stdlib.h>
19
20#define LOOPS_DEFAULT 10000000
21static	int loops = LOOPS_DEFAULT;
22
23static const struct option options[] = {
24	OPT_INTEGER('l', "loop",	&loops,		"Specify number of loops"),
25	OPT_END()
26};
27
28static const char * const bench_syscall_usage[] = {
29	"perf bench syscall <options>",
30	NULL
31};
32
33int bench_syscall_basic(int argc, const char **argv)
34{
35	struct timeval start, stop, diff;
36	unsigned long long result_usec = 0;
37	int i;
38
39	argc = parse_options(argc, argv, options, bench_syscall_usage, 0);
40
41	gettimeofday(&start, NULL);
42
43	for (i = 0; i < loops; i++)
44		getppid();
45
46	gettimeofday(&stop, NULL);
47	timersub(&stop, &start, &diff);
48
49	switch (bench_format) {
50	case BENCH_FORMAT_DEFAULT:
51		printf("# Executed %'d getppid() calls\n", loops);
52
53		result_usec = diff.tv_sec * 1000000;
54		result_usec += diff.tv_usec;
55
56		printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
57		       diff.tv_sec,
58		       (unsigned long) (diff.tv_usec/1000));
59
60		printf(" %14lf usecs/op\n",
61		       (double)result_usec / (double)loops);
62		printf(" %'14d ops/sec\n",
63		       (int)((double)loops /
64			     ((double)result_usec / (double)1000000)));
65		break;
66
67	case BENCH_FORMAT_SIMPLE:
68		printf("%lu.%03lu\n",
69		       diff.tv_sec,
70		       (unsigned long) (diff.tv_usec / 1000));
71		break;
72
73	default:
74		/* reaching here is something disaster */
75		fprintf(stderr, "Unknown format:%d\n", bench_format);
76		exit(1);
77		break;
78	}
79
80	return 0;
81}