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/* bmark.c */
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include "config.h"
#include "bmark.h"
#include "main.h"
#include "sysinfo.h"
#include "trivial.h"
#include "programs.h"
extern int opt_prog_bar;
static pid_t pid; /* we need to get to it from the signal handler */
unsigned long bmark(struct load *ld)
{
int status, tmpfd;
char template[]="bmark_tmpXXXXXX";
struct bench_results res;
struct rusage ru;
struct timeval before, after;
sigset_t sigset;
struct sigaction sa;
struct stat statbuf;
ld->child_pid=0;
if(pipe(ld->pipe)==-1){
printsys("error creating pipe\n");
}
if((pid=fork())==-1){
printsys("fork error\n");
} else if(pid){ /* parent, returns to caller in main.c */
ld->child_pid=pid;
return pid;
}
/* child */
/*
* TODO: just make a freaking pipe (when feeling less lazy)
*/
if((tmpfd=mkstemp(template))==-1){
if(errno==EINVAL){
printe("internal error: contact maintainer\n");
exit(2);
}
printsys("Can't get a temporary file name in the current "
"directory\n");
}
if(dup2(tmpfd, TMP_FD)==-1){
printsys("error dup2ing tmpfd\n");
}
close(tmpfd);
restore_signals();
/* fill a structure to block all irrelevant signals */
sigfillset(&sigset);
sigdelset(&sigset, SIGCHLD);
sigdelset(&sigset, SIGUSR1);
/* pass it to the kernel */
sigprocmask(SIG_SETMASK, &sigset, NULL);
/* prepare sigaction struct */
sa.sa_handler=&sig_usr1;
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGUSR1);
sa.sa_flags=SA_RESTART;
gettimeofday(&before, NULL);
if((pid=fork())==-1){
printf("fork error\n");
return 0;
} else if(!pid){ /* child, is waited for in bmark() */
unblock_signals();
ld->do_load();
exit(0);
}
/* parent */
/*
* we wait for the child, but if we get
* SIGUSR1, we kill it from the signal handler
* and return here to wait for it again
*/
sigaction(SIGUSR1, &sa, NULL);
if(wait4(pid, &status, 0, &ru)!=pid){
printsys("bmark: error waiting for child\n");
}
gettimeofday(&after, NULL);
if(stat(template, &statbuf)==-1){
printsys("could not get loadruns");
}
if(unlink(template)){
printsys("could not unlink file %s\n", template);
}
res.loadruns=statbuf.st_size;
printd("read loadruns=%lu\n", res.loadruns);
res.utime=ru.ru_utime.tv_sec;
res.systime=ru.ru_stime.tv_sec;
res.elapsed=after.tv_sec - before.tv_sec;
res.major_faults=ru.ru_majflt;
res.minor_faults=ru.ru_minflt;
printd("child: about to write data to parent\n");
if(write(ld->pipe[1], &res, sizeof(struct bench_results))!=
sizeof(struct bench_results)){
printf("error transferring data to parent\n");
exit(1);
}
printd("child: wrote it\n");
exit(0);
}
/*
* we get SIGUSR1 by the parent when kernel compilation
* has finished and we must kill the child that generates
* the load
*/
void sig_usr1(int whatever)
{
printd("pid=%d, got SIGUSR1, killing process %d\n", getpid(), pid);
if(kill(pid, SIGTERM) && (errno!=ESRCH)){
printsys("could not kill process %lu\n", pid);
}
whatever=0;
return;
}
struct bench_results compile_kernel(struct load *ld)
{
pid_t pid;
int status, ret, perc;
unsigned long time=0, estimate;
struct rusage ru;
struct bench_results res;
struct timeval before, after;
estimate=est_elapsed(ld->logfile);
if(opt_prog_bar){
if(estimate){
printf("estimated progress according to previous runs:\n");
} else {
printf("no previous results for estimate...\n");
}
}
estimate *= 4; /* we sleep for 1/4 sec */
block_signals(); /* we need to unblock them in the child, too */
gettimeofday(&before, NULL);
if((pid=fork())<0){
printf("fork error, aborting\n");
exit(1);
} else if(!pid){ /* child */
int fd;
int cpus;
char buf[20];
unblock_signals();
if(get_cpus(&cpus)){
printw("no info on number of cpus, using default=1\n");
cpus=1;
}
if((fd=open("/dev/null", O_WRONLY))==-1){
printsys("could not open /dev/null\n");
}
close(STDOUT_FILENO);
close(STDERR_FILENO);
if(dup2(fd, STDOUT_FILENO)==-1){
printsys("error redirecting stdout to /dev/null\n");
}
if(dup2(fd, STDERR_FILENO)==-1){
printsys("error redirecting stderr to /dev/null\n");
}
snprintf(buf, 20, "%d", 4*cpus);
if(execlp(MAKE_BIN, MAKE_BIN, "bzImage", "-j", buf, NULL)){
printsys("failed execing make bzImage\n");
}
}
harvester_add_child(pid);
unblock_signals();
printd("waiting for child with pid %d\n", pid);
if(opt_prog_bar){
while((ret=wait4(pid, &status, WNOHANG, &ru))!=pid){
if(ret==-1){
printsys("wait failed\n");
}
usleep(250000); /* 1/4 sec */
time+=1;
if(estimate){
perc=(100*time)/estimate;
if(perc>100){
perc=100;
estimate=0;
print_prog_bar(100);
printf("\nalmost done ...\n");
} else {
print_prog_bar(perc);
}
}
}
} else if(wait4(pid, &status, 0, &ru)!=pid){
printsys("could not wait for pid %d\n", pid);
}
gettimeofday(&after, NULL);
harvester_del_child(pid);
if(estimate && opt_prog_bar){
print_prog_bar(100);
printf("\n");
}
res.utime=ru.ru_utime.tv_sec;
res.systime=ru.ru_stime.tv_sec;
res.elapsed=after.tv_sec - before.tv_sec;
res.major_faults=ru.ru_majflt;
res.minor_faults=ru.ru_minflt;
return res;
}
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