/******************************************************************************
* *
* Function: *
* *
* Purpose: *
* *
* Parameters: *
* *
* Return value: *
* *
* Comments: *
* *
******************************************************************************/
ZBX_THREAD_ENTRY(monitor_thread, args)
{
assert(args);
zabbix_log(LOG_LEVEL_INFORMATION, "jobarg_monitor #%d started [monitor]", ((zbx_thread_args_t *) args)->thread_num);
zbx_free(args);
DBconnect(ZBX_DB_CONNECT_NORMAL);
CONFIG_SPAN_TIME = ja_schedule_load_span();
while (ZBX_IS_RUNNING()) {
zbx_setproctitle("process monitor");
process_monitor();
zbx_sleep(CONFIG_JAMONITOR_INTERVAL);
}
zabbix_log(LOG_LEVEL_INFORMATION, "jobarg_monitor stopped");
zbx_thread_exit(0);
}
void limit_process(pid_t pid, double limit, int ignore_children)
{
//slice of the slot in which the process is allowed to run
struct timespec twork;
//slice of the slot in which the process is stopped
struct timespec tsleep;
//when the last twork has started
struct timeval startwork;
//when the last twork has finished
struct timeval endwork;
//initialization
memset(&twork, 0, sizeof(struct timespec));
memset(&tsleep, 0, sizeof(struct timespec));
memset(&startwork, 0, sizeof(struct timeval));
memset(&endwork, 0, sizeof(struct timeval));
//last working time in microseconds
unsigned long workingtime = 0;
//generic list item
struct list_node *node;
//counter
int c = 0;
//get a better priority
//increase_priority();
//build the family
if (create_process_family(&pf, pid) == -1)
{
printf("create process family failed");
return ;
}
if (ignore_children) {
//delete any process with a different pid than the father
node = pf.members.first;
while (node!=NULL) {
struct process *proc = (struct process*)(node->data);
if (proc->pid != pid)
{
remove_process_from_family(&pf, proc->pid);
node = pf.members.first;
continue;
}
node = node->next;
}
}
if (!ignore_children && verbose) printf("Members in the family owned by %d: %d\n", pf.father, pf.members.count);
//rate at which we are keeping active the processes (range 0-1)
//1 means that the process are using all the twork slice
double workingrate = -1;
while(1) {
if (!ignore_children && c%10==0) {
//update the process family (checks only for new members)
int new_children = update_process_family(&pf);
if (verbose && new_children) {
printf("%d new children processes detected (", new_children);
int j;
node = pf.members.last;
for (j=0; j<new_children; j++) {
printf("%d", ((struct process*)(node->data))->pid);
if (j<new_children-1) printf(" ");
node = node->previous;
}
printf(")\n");
}
}
if (pf.members.count==0) {
if (verbose) printf("No more processes.\n");
break;
}
//total cpu actual usage (range 0-1)
//1 means that the processes are using 100% cpu
double pcpu = -1;
//estimate how much the controlled processes are using the cpu in the working interval
node = pf.members.first;
while (node!=NULL) {
struct process *proc = (struct process*)(node->data);
if (proc->is_zombie) {
//process is zombie, remove it from family
fprintf(stderr,"Process %d is zombie!\n", proc->pid);
remove_process_from_family(&pf, proc->pid);
node = pf.members.first;
continue;
}
if (process_monitor(proc) != 0) {
//process is dead, remove it from family
if (verbose) fprintf(stderr,"Process %d dead!\n", proc->pid);
remove_process_from_family(&pf, proc->pid);
node = pf.members.first;
continue;
}
node = node->next;
if (proc->cpu_usage<0) {
continue;
}
if (pcpu<0) pcpu = 0;
pcpu += proc->cpu_usage;
}
//adjust work and sleep time slices
if (pcpu < 0) {
//it's the 1st cycle, initialize workingrate
pcpu = limit;
workingrate = limit;
twork.tv_nsec = TIME_SLOT*limit*1000;
}
else {
//adjust workingrate
workingrate = MIN(workingrate / pcpu * limit, 1);
twork.tv_nsec = TIME_SLOT*1000*workingrate;
}
tsleep.tv_nsec = TIME_SLOT*1000-twork.tv_nsec;
if (verbose) {
if (c%200==0)
printf("\n%%CPU\twork quantum\tsleep quantum\tactive rate\n");
if (c%10==0 && c>0)
printf("%0.2lf%%\t%6ld us\t%6ld us\t%0.2lf%%\n",pcpu*100,twork.tv_nsec/1000,tsleep.tv_nsec/1000,workingrate*100);
}
//resume processes
node = pf.members.first;
while (node!=NULL) {
struct process *proc = (struct process*)(node->data);
if (kill(proc->pid,SIGCONT)!=0) {
//process is dead, remove it from family
if (verbose) fprintf(stderr,"Process %d dead!\n", proc->pid);
remove_process_from_family(&pf, proc->pid);
node = pf.members.first;
continue;
}
node=node->next;
}
//now processes are free to run (same working slice for all)
gettimeofday(&startwork, NULL);
nanosleep(&twork,NULL);
gettimeofday(&endwork, NULL);
workingtime = timediff(&endwork,&startwork);
long delay = workingtime-twork.tv_nsec/1000;
if (c>0 && delay>10000) {
//delay is too much! signal to user?
//fprintf(stderr, "%d %ld us\n", c, delay);
}
if (tsleep.tv_nsec>0) {
//stop only if tsleep>0, instead it's useless
node=pf.members.first;
while (node!=NULL) {
struct process *proc = (struct process*)(node->data);
if (kill(proc->pid,SIGSTOP)!=0) {
//process is dead, remove it from family
if (verbose) fprintf(stderr,"Process %d dead!\n", proc->pid);
remove_process_from_family(&pf, proc->pid);
node=pf.members.first;
continue;
}
node=node->next;
}
//now the processes are sleeping
nanosleep(&tsleep,NULL);
}
c++;
}
cleanup_process_family(&pf);
}