1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun *
3*4882a593Smuzhiyun * syscall.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * syscall: Benchmark for system call performance
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include "../perf.h"
8*4882a593Smuzhiyun #include "../util/util.h"
9*4882a593Smuzhiyun #include <subcmd/parse-options.h>
10*4882a593Smuzhiyun #include "../builtin.h"
11*4882a593Smuzhiyun #include "bench.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <stdio.h>
14*4882a593Smuzhiyun #include <sys/time.h>
15*4882a593Smuzhiyun #include <sys/syscall.h>
16*4882a593Smuzhiyun #include <sys/types.h>
17*4882a593Smuzhiyun #include <unistd.h>
18*4882a593Smuzhiyun #include <stdlib.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #define LOOPS_DEFAULT 10000000
21*4882a593Smuzhiyun static int loops = LOOPS_DEFAULT;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static const struct option options[] = {
24*4882a593Smuzhiyun OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
25*4882a593Smuzhiyun OPT_END()
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun static const char * const bench_syscall_usage[] = {
29*4882a593Smuzhiyun "perf bench syscall <options>",
30*4882a593Smuzhiyun NULL
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
bench_syscall_basic(int argc,const char ** argv)33*4882a593Smuzhiyun int bench_syscall_basic(int argc, const char **argv)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun struct timeval start, stop, diff;
36*4882a593Smuzhiyun unsigned long long result_usec = 0;
37*4882a593Smuzhiyun int i;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun argc = parse_options(argc, argv, options, bench_syscall_usage, 0);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun gettimeofday(&start, NULL);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun for (i = 0; i < loops; i++)
44*4882a593Smuzhiyun getppid();
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun gettimeofday(&stop, NULL);
47*4882a593Smuzhiyun timersub(&stop, &start, &diff);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun switch (bench_format) {
50*4882a593Smuzhiyun case BENCH_FORMAT_DEFAULT:
51*4882a593Smuzhiyun printf("# Executed %'d getppid() calls\n", loops);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun result_usec = diff.tv_sec * 1000000;
54*4882a593Smuzhiyun result_usec += diff.tv_usec;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
57*4882a593Smuzhiyun diff.tv_sec,
58*4882a593Smuzhiyun (unsigned long) (diff.tv_usec/1000));
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun printf(" %14lf usecs/op\n",
61*4882a593Smuzhiyun (double)result_usec / (double)loops);
62*4882a593Smuzhiyun printf(" %'14d ops/sec\n",
63*4882a593Smuzhiyun (int)((double)loops /
64*4882a593Smuzhiyun ((double)result_usec / (double)1000000)));
65*4882a593Smuzhiyun break;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun case BENCH_FORMAT_SIMPLE:
68*4882a593Smuzhiyun printf("%lu.%03lu\n",
69*4882a593Smuzhiyun diff.tv_sec,
70*4882a593Smuzhiyun (unsigned long) (diff.tv_usec / 1000));
71*4882a593Smuzhiyun break;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun default:
74*4882a593Smuzhiyun /* reaching here is something disaster */
75*4882a593Smuzhiyun fprintf(stderr, "Unknown format:%d\n", bench_format);
76*4882a593Smuzhiyun exit(1);
77*4882a593Smuzhiyun break;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun return 0;
81*4882a593Smuzhiyun }
82