diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/bench/syscall.c | 123 |
1 files changed, 115 insertions, 8 deletions
diff --git a/tools/perf/bench/syscall.c b/tools/perf/bench/syscall.c index 5fe621cff8e9..e7dc216f717f 100644 --- a/tools/perf/bench/syscall.c +++ b/tools/perf/bench/syscall.c @@ -14,11 +14,15 @@ #include <sys/time.h> #include <sys/syscall.h> #include <sys/types.h> +#include <sys/wait.h> #include <unistd.h> #include <stdlib.h> -#define LOOPS_DEFAULT 10000000 -static int loops = LOOPS_DEFAULT; +#ifndef __NR_fork +#define __NR_fork -1 +#endif + +static int loops; static const struct option options[] = { OPT_INTEGER('l', "loop", &loops, "Specify number of loops"), @@ -30,31 +34,114 @@ static const char * const bench_syscall_usage[] = { NULL }; -int bench_syscall_basic(int argc, const char **argv) +static void test_fork(void) +{ + pid_t pid = fork(); + + if (pid < 0) { + fprintf(stderr, "fork failed\n"); + exit(1); + } else if (pid == 0) { + exit(0); + } else { + if (waitpid(pid, NULL, 0) < 0) { + fprintf(stderr, "waitpid failed\n"); + exit(1); + } + } +} + +static void test_execve(void) +{ + const char *pathname = "/bin/true"; + char *const argv[] = { (char *)pathname, NULL }; + pid_t pid = fork(); + + if (pid < 0) { + fprintf(stderr, "fork failed\n"); + exit(1); + } else if (pid == 0) { + execve(pathname, argv, NULL); + fprintf(stderr, "execve /bin/true failed\n"); + exit(1); + } else { + if (waitpid(pid, NULL, 0) < 0) { + fprintf(stderr, "waitpid failed\n"); + exit(1); + } + } +} + +static int bench_syscall_common(int argc, const char **argv, int syscall) { struct timeval start, stop, diff; unsigned long long result_usec = 0; + const char *name = NULL; int i; + switch (syscall) { + case __NR_fork: + case __NR_execve: + /* Limit default loop to 10000 times to save time */ + loops = 10000; + break; + default: + loops = 10000000; + break; + } + + /* Options -l and --loops override default above */ argc = parse_options(argc, argv, options, bench_syscall_usage, 0); gettimeofday(&start, NULL); - for (i = 0; i < loops; i++) - getppid(); + for (i = 0; i < loops; i++) { + switch (syscall) { + case __NR_getppid: + getppid(); + break; + case __NR_getpgid: + getpgid(0); + break; + case __NR_fork: + test_fork(); + break; + case __NR_execve: + test_execve(); + default: + break; + } + } gettimeofday(&stop, NULL); timersub(&stop, &start, &diff); + switch (syscall) { + case __NR_getppid: + name = "getppid()"; + break; + case __NR_getpgid: + name = "getpgid()"; + break; + case __NR_fork: + name = "fork()"; + break; + case __NR_execve: + name = "execve()"; + break; + default: + break; + } + switch (bench_format) { case BENCH_FORMAT_DEFAULT: - printf("# Executed %'d getppid() calls\n", loops); + printf("# Executed %'d %s calls\n", loops, name); result_usec = diff.tv_sec * 1000000; result_usec += diff.tv_usec; printf(" %14s: %lu.%03lu [sec]\n\n", "Total time", - diff.tv_sec, + (unsigned long) diff.tv_sec, (unsigned long) (diff.tv_usec/1000)); printf(" %14lf usecs/op\n", @@ -66,7 +153,7 @@ int bench_syscall_basic(int argc, const char **argv) case BENCH_FORMAT_SIMPLE: printf("%lu.%03lu\n", - diff.tv_sec, + (unsigned long) diff.tv_sec, (unsigned long) (diff.tv_usec / 1000)); break; @@ -79,3 +166,23 @@ int bench_syscall_basic(int argc, const char **argv) return 0; } + +int bench_syscall_basic(int argc, const char **argv) +{ + return bench_syscall_common(argc, argv, __NR_getppid); +} + +int bench_syscall_getpgid(int argc, const char **argv) +{ + return bench_syscall_common(argc, argv, __NR_getpgid); +} + +int bench_syscall_fork(int argc, const char **argv) +{ + return bench_syscall_common(argc, argv, __NR_fork); +} + +int bench_syscall_execve(int argc, const char **argv) +{ + return bench_syscall_common(argc, argv, __NR_execve); +} |