8bf98b8968
When NDEBUG is defined, the assert macro will be expanded to nothing.
Some assert calls used in perf are also including some functionality
(e.g. system calls), not only validity checks. Therefore, if NDEBUG is
defined, this functionality will be removed along with the assert. Perf
also defines BUG_ON based on assert, so it has the same problem.
Define BUG_ON so that the condition will be executed when NDEBUG is
defined. Replace the assert statements that have these side effects
with BUG_ON.
For defining BUG_ON, use "if (cond) {}" insted of "if (cond) ;" because
in the latter case build fails with "error: suggest braces around empty
body in an ‘if’ statement [-Werror=empty-body]"
Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1347082551-2394-1-git-send-email-irina.tirdea@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/*
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*
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* sched-pipe.c
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*
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* pipe: Benchmark for pipe()
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*
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* Based on pipe-test-1m.c by Ingo Molnar <mingo@redhat.com>
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* http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c
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* Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
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*
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*/
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#include "../perf.h"
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#include "../util/util.h"
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#include "../util/parse-options.h"
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#include "../builtin.h"
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#include "bench.h"
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <linux/unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#define LOOPS_DEFAULT 1000000
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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,
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"Specify number of loops"),
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OPT_END()
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};
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static const char * const bench_sched_pipe_usage[] = {
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"perf bench sched pipe <options>",
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NULL
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};
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int bench_sched_pipe(int argc, const char **argv,
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const char *prefix __used)
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{
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int pipe_1[2], pipe_2[2];
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int m = 0, i;
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struct timeval start, stop, diff;
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unsigned long long result_usec = 0;
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/*
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* why does "ret" exist?
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* discarding returned value of read(), write()
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* causes error in building environment for perf
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*/
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int __used ret, wait_stat;
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pid_t pid, retpid __used;
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argc = parse_options(argc, argv, options,
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bench_sched_pipe_usage, 0);
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BUG_ON(pipe(pipe_1));
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BUG_ON(pipe(pipe_2));
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pid = fork();
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assert(pid >= 0);
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gettimeofday(&start, NULL);
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if (!pid) {
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for (i = 0; i < loops; i++) {
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ret = read(pipe_1[0], &m, sizeof(int));
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ret = write(pipe_2[1], &m, sizeof(int));
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}
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} else {
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for (i = 0; i < loops; i++) {
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ret = write(pipe_1[1], &m, sizeof(int));
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ret = read(pipe_2[0], &m, sizeof(int));
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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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if (pid) {
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retpid = waitpid(pid, &wait_stat, 0);
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assert((retpid == pid) && WIFEXITED(wait_stat));
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} else {
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exit(0);
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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 pipe operations between two tasks\n\n",
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loops);
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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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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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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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