Avoid scheduling vCPUs that are blocked, there's no point in assigning
them to a pCPU because they are not going to run anyway and might
prevent a non-blocked vCPU from actually running.
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
Cc: George Dunlap <george.dun...@eu.citrix.com>
Cc: Dario Faggioli <raist...@linux.it>
---
xen/common/sched_null.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/xen/common/sched_null.c b/xen/common/sched_null.c
index b4a24baf8e..78a3b12845 100644
--- a/xen/common/sched_null.c
+++ b/xen/common/sched_null.c
@@ -781,6 +781,10 @@ static struct task_slice null_schedule(const struct
scheduler *ops,
{
list_for_each_entry( wvc, &prv->waitq, waitq_elem )
{
+ if ( test_bit(_VPF_down, &wvc->vcpu->pause_flags) )
+ /* Skip vCPUs that are down. */
+ continue;
+
if ( bs == BALANCE_SOFT_AFFINITY &&
!has_soft_affinity(wvc->vcpu,
wvc->vcpu->cpu_hard_affinity) )
continue;
--
2.14.3 (Apple Git-98)
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