/*
* Debug related code, dump vcpu/cpu information
*/
static void
rt_dump_vcpu(const struct scheduler *ops, const struct rt_vcpu *svc)
{
char cpustr[1024];
cpumask_t *cpupool_mask;
ASSERT(svc != NULL);
/* idle vcpu */
if( svc->sdom == NULL )
{
printk("\n");
return;
}
cpumask_scnprintf(cpustr, sizeof(cpustr), svc->vcpu->cpu_hard_affinity);
printk("[%5d.%-2u] cpu %u, (%"PRI_stime", %"PRI_stime"),"
" cur_b=%"PRI_stime" cur_d=%"PRI_stime" last_start=%"PRI_stime"\n"
" \t\t onQ=%d runnable=%d cpu_hard_affinity=%s ",
svc->vcpu->domain->domain_id,
svc->vcpu->vcpu_id,
svc->vcpu->processor,
svc->period,
svc->budget,
svc->cur_budget,
svc->cur_deadline,
svc->last_start,
__vcpu_on_q(svc),
vcpu_runnable(svc->vcpu),
cpustr);
memset(cpustr, 0, sizeof(cpustr));
cpupool_mask = cpupool_scheduler_cpumask(svc->vcpu->domain->cpupool);
cpumask_scnprintf(cpustr, sizeof(cpustr), cpupool_mask);
printk("cpupool=%s\n", cpustr);
}
/*
* Debug related code, dump vcpu/cpu information
*/
static void
rt_dump_vcpu(struct rt_vcpu *svc)
{
char *cpustr = keyhandler_scratch;
if ( svc == NULL )
{
printk("NULL!\n");
return;
}
cpumask_scnprintf(cpustr, sizeof(cpustr), svc->vcpu->cpu_hard_affinity);
printk("OCBP:_dumpP: [%5d.%-2d] cpu %d, Period %"PRId64", Budget_low %"PRId64", Budget_high %"PRId64", Deadline %"PRId64",Criticality %d,Offline_flag %d, cur_b=%"PRId64",onR=%d runnable=%d cpu_hard_affinity=%s",
svc->vcpu->domain->domain_id,
svc->vcpu->vcpu_id,
svc->vcpu->processor,
svc->period,
svc->budget_low,
svc->budget_high,
svc->deadline,
svc->criticality_vcpu,
svc->offl_flag,
svc->cur_budget,
__vcpu_on_runq(svc),
vcpu_runnable(svc->vcpu),
cpustr);
memset(cpustr, 0, sizeof(char)*1024);
cpumask_scnprintf(cpustr, sizeof(cpustr), cpupool_scheduler_cpumask(svc->vcpu->domain->cpupool));
printk("cpupool=%s\n", cpustr);
}
void vcpu_sleep_sync(struct vcpu *v)
{
vcpu_sleep_nosync(v);
while ( !vcpu_runnable(v) && v->is_running )
cpu_relax();
sync_vcpu_execstate(v);
}
void vcpu_sleep_nosync(struct vcpu *v)
{
unsigned long flags;
vcpu_schedule_lock_irqsave(v, flags);
if ( likely(!vcpu_runnable(v)) )
{
if ( v->runstate.state == RUNSTATE_runnable )
vcpu_runstate_change(v, RUNSTATE_offline, NOW());
SCHED_OP(sleep, v);
}
vcpu_schedule_unlock_irqrestore(v, flags);
TRACE_2D(TRC_SCHED_SLEEP, v->domain->domain_id, v->vcpu_id);
}
/*
* Debug related code, dump vcpu/cpu information
*/
static void
rt_dump_vcpu(const struct scheduler *ops, const struct rt_vcpu *svc)
{
cpumask_t *cpupool_mask, *mask;
ASSERT(svc != NULL);
/* idle vcpu */
if( svc->sdom == NULL )
{
printk("\n");
return;
}
/*
* We can't just use 'cpumask_scratch' because the dumping can
* happen from a pCPU outside of this scheduler's cpupool, and
* hence it's not right to use the pCPU's scratch mask (which
* may even not exist!). On the other hand, it is safe to use
* svc->vcpu->processor's own scratch space, since we hold the
* runqueue lock.
*/
mask = _cpumask_scratch[svc->vcpu->processor];
cpupool_mask = cpupool_domain_cpumask(svc->vcpu->domain);
cpumask_and(mask, cpupool_mask, svc->vcpu->cpu_hard_affinity);
cpulist_scnprintf(keyhandler_scratch, sizeof(keyhandler_scratch), mask);
printk("[%5d.%-2u] cpu %u, (%"PRI_stime", %"PRI_stime"),"
" cur_b=%"PRI_stime" cur_d=%"PRI_stime" last_start=%"PRI_stime"\n"
" \t\t onQ=%d runnable=%d flags=%x effective hard_affinity=%s\n",
svc->vcpu->domain->domain_id,
svc->vcpu->vcpu_id,
svc->vcpu->processor,
svc->period,
svc->budget,
svc->cur_budget,
svc->cur_deadline,
svc->last_start,
__vcpu_on_q(svc),
vcpu_runnable(svc->vcpu),
svc->flags,
keyhandler_scratch);
}
void vcpu_wake(struct vcpu *v)
{
unsigned long flags;
vcpu_schedule_lock_irqsave(v, flags);
if ( likely(vcpu_runnable(v)) )
{
if ( v->runstate.state >= RUNSTATE_blocked )
vcpu_runstate_change(v, RUNSTATE_runnable, NOW());
SCHED_OP(wake, v);
}
else if ( !test_bit(_VPF_blocked, &v->pause_flags) )
{
if ( v->runstate.state == RUNSTATE_blocked )
vcpu_runstate_change(v, RUNSTATE_offline, NOW());
}
vcpu_schedule_unlock_irqrestore(v, flags);
TRACE_2D(TRC_SCHED_WAKE, v->domain->domain_id, v->vcpu_id);
}
/**
* Xen scheduler callback function to select a VCPU to run.
* This is the main scheduler routine.
*
* @param ops Pointer to this instance of the scheduler structure
* @param now Current time
*
* @return Address of the VCPU structure scheduled to be run next
* Amount of time to execute the returned VCPU
* Flag for whether the VCPU was migrated
*/
static struct task_slice
a653sched_do_schedule(
const struct scheduler *ops,
s_time_t now,
bool_t tasklet_work_scheduled)
{
struct task_slice ret; /* hold the chosen domain */
struct vcpu * new_task = NULL;
static unsigned int sched_index = 0;
static s_time_t next_switch_time;
a653sched_priv_t *sched_priv = SCHED_PRIV(ops);
const unsigned int cpu = smp_processor_id();
unsigned long flags;
spin_lock_irqsave(&sched_priv->lock, flags);
if ( sched_priv->num_schedule_entries < 1 )
sched_priv->next_major_frame = now + DEFAULT_TIMESLICE;
else if ( now >= sched_priv->next_major_frame )
{
/* time to enter a new major frame
* the first time this function is called, this will be true */
/* start with the first domain in the schedule */
sched_index = 0;
sched_priv->next_major_frame = now + sched_priv->major_frame;
next_switch_time = now + sched_priv->schedule[0].runtime;
}
else
{
while ( (now >= next_switch_time)
&& (sched_index < sched_priv->num_schedule_entries) )
{
/* time to switch to the next domain in this major frame */
sched_index++;
next_switch_time += sched_priv->schedule[sched_index].runtime;
}
}
/*
* If we exhausted the domains in the schedule and still have time left
* in the major frame then switch next at the next major frame.
*/
if ( sched_index >= sched_priv->num_schedule_entries )
next_switch_time = sched_priv->next_major_frame;
/*
* If there are more domains to run in the current major frame, set
* new_task equal to the address of next domain's VCPU structure.
* Otherwise, set new_task equal to the address of the idle task's VCPU
* structure.
*/
new_task = (sched_index < sched_priv->num_schedule_entries)
? sched_priv->schedule[sched_index].vc
: IDLETASK(cpu);
/* Check to see if the new task can be run (awake & runnable). */
if ( !((new_task != NULL)
&& (AVCPU(new_task) != NULL)
&& AVCPU(new_task)->awake
&& vcpu_runnable(new_task)) )
new_task = IDLETASK(cpu);
BUG_ON(new_task == NULL);
/*
* Check to make sure we did not miss a major frame.
* This is a good test for robust partitioning.
*/
BUG_ON(now >= sched_priv->next_major_frame);
spin_unlock_irqrestore(&sched_priv->lock, flags);
/* Tasklet work (which runs in idle VCPU context) overrides all else. */
if ( tasklet_work_scheduled )
new_task = IDLETASK(cpu);
/* Running this task would result in a migration */
if ( !is_idle_vcpu(new_task)
&& (new_task->processor != cpu) )
new_task = IDLETASK(cpu);
/*
* Return the amount of time the next domain has to run and the address
* of the selected task's VCPU structure.
*/
ret.time = next_switch_time - now;
ret.task = new_task;
ret.migrated = 0;
BUG_ON(ret.time <= 0);
return ret;
}