Add counters to struct sched_unit summing up runstates of associated
vcpus. This allows doing quick checks whether a unit has any vcpu
running or whether only a single vcpu of a unit is running.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
RFC V2: add counters for each possible runstate
---
xen/common/schedule.c | 5 +++++
xen/include/xen/sched.h | 2 ++
2 files changed, 7 insertions(+)
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index dc68cb912e..772de8de96 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -246,6 +246,7 @@ static inline void vcpu_runstate_change(
struct vcpu *v, int new_state, s_time_t new_entry_time)
{
s_time_t delta;
+ struct sched_unit *unit = v->sched_unit;
ASSERT(v->runstate.state != new_state);
ASSERT(spin_is_locked(get_sched_res(v->processor)->schedule_lock));
@@ -254,6 +255,9 @@ static inline void vcpu_runstate_change(
trace_runstate_change(v, new_state);
+ unit->runstate_cnt[v->runstate.state]--;
+ unit->runstate_cnt[new_state]++;
+
delta = new_entry_time - v->runstate.state_entry_time;
if ( delta > 0 )
{
@@ -378,6 +382,7 @@ static struct sched_unit *sched_alloc_unit(struct vcpu *v)
unit->vcpu_list = v;
unit->unit_id = v->vcpu_id;
unit->domain = d;
+ unit->runstate_cnt[v->runstate.state]++;
for ( prev_unit = &d->sched_unit_list; *prev_unit;
prev_unit = &(*prev_unit)->next_in_list )
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 6de9ddaaa9..92272256ea 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -277,6 +277,8 @@ struct sched_unit {
/* Last time unit got (de-)scheduled. */
uint64_t state_entry_time;
+ /* Vcpu state summary. */
+ unsigned int runstate_cnt[4];
/* Bitmask of CPUs on which this VCPU may run. */
cpumask_var_t cpu_hard_affinity;
--
2.16.4
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