int set_process(pid_t pid, int policy, struct sched_param_ex *p)
{
int ret;
char *msg1="could not set PID %d to %s";
char *msg2="could not set PID %d to raw policy #%d";
/* anything other than 0 indicates error */
if((ret=sched_setscheduler_ex(pid, policy, sizeof(*p), p))) {
/* la la pointer mismatch .. lala */
decode_error((CHECK_RANGE_POLICY(policy) ? msg1 : msg2),
pid,
(CHECK_RANGE_POLICY(policy) ? TAB[policy] : policy)
);
return(ret);
}
return(0);
}
/**
* set the scheduler internally in the Linux kernel.
*/
static int edf_set_scheduler(resch_task_t *rt, int prio)
{
struct sched_param sp;
struct sched_param_ex spx;
struct timespec ts_period, ts_deadline, ts_runtime;
jiffies_to_timespec(rt->period, &ts_period);
jiffies_to_timespec(rt->deadline, &ts_deadline);
jiffies_to_timespec(usecs_to_jiffies(rt->runtime), &ts_runtime);
sp.sched_priority = 0;
spx.sched_priority = 0;
spx.sched_period = ts_period;
spx.sched_deadline = ts_deadline;
spx.sched_runtime = ts_runtime;
spx.sched_flags = 0;
if (sched_setscheduler_ex(rt->task, SCHED_DEADLINE, &sp, &spx) < 0) {
printk(KERN_WARNING "RESCH: edf_set_scheduler() failed.\n");
printk(KERN_WARNING "RESCH: task#%d (process#%d) priority=%d.\n",
rt->rid, rt->task->pid, prio);
return false;
}
rt->prio = prio;
if (task_has_reserve(rt)) {
rt->task->dl.flags &= ~SCHED_EXHAUSTIVE;
rt->task->dl.flags |= SCHED_FCBS;
/* you can additionally set the following flags, if wanted.
rt->task->dl.flags |= SCHED_FCBS_NO_CATCH_UP; */
}
else {
rt->task->dl.flags |= SCHED_EXHAUSTIVE;
rt->task->dl.flags &= ~SCHED_FCBS;
}
return true;
}