[Xen-devel] [PATCH RFC V2 29/45] xen/sched: add runstate counters to struct sched_item

[Juergen Gross <jgross@xxxxxxxx>]

Add counters to struct sched_item summing up runstates of associated
vcpus.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
RFC V2: add counters for each possible runstate
---
 xen/common/schedule.c   | 6 ++++++
 xen/include/xen/sched.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index bc0554f2da..67871b6618 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -174,6 +174,7 @@ static inline void vcpu_runstate_change(
     struct vcpu *v, int new_state, s_time_t new_entry_time)
 {
     s_time_t delta;
+    struct sched_item *item = v->sched_item;
 
     ASSERT(v->runstate.state != new_state);
     ASSERT(spin_is_locked(per_cpu(sched_res, v->processor)->schedule_lock));
@@ -182,6 +183,9 @@ static inline void vcpu_runstate_change(
 
     trace_runstate_change(v, new_state);
 
+    item->runstate_cnt[v->runstate.state]--;
+    item->runstate_cnt[new_state]++;
+
     delta = new_entry_time - v->runstate.state_entry_time;
     if ( delta > 0 )
     {
@@ -359,6 +363,8 @@ int sched_init_vcpu(struct vcpu *v)
     if ( (item = sched_alloc_item(v)) == NULL )
         return 1;
 
+    item->runstate_cnt[v->runstate.state]++;
+
     if ( is_idle_domain(d) )
         processor = v->vcpu_id;
     else
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 8052f98780..571631f217 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -272,6 +272,8 @@ struct sched_item {
     uint64_t               last_run_time;
     /* Last time item got (de-)scheduled. */
     uint64_t               state_entry_time;
+    /* Vcpu state summary. */
+    unsigned int           runstate_cnt[4];
 
     /* Currently running on a CPU? */
     bool                   is_running;
-- 
2.16.4


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