From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
commit a420b0630362c2c451060e6187e36d72df827134 upstream.
We want sched_groups to be sibling child domains (or individual CPUs
when there are no child domains). Furthermore, since the first group
of a domain should include the CPU of that domain, the first group of
each domain should match the child domain.
Verify this is indeed so.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/topology.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 3d50ee38b8fb..81c82031ed95 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -93,6 +93,12 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
group->sgc->capacity);
}
+ if (group == sd->groups && sd->child &&
+ !cpumask_equal(sched_domain_span(sd->child),
+ sched_group_cpus(group))) {
+ printk(KERN_ERR "ERROR: domain->groups does not match domain->child\n");
+ }
+
group = group->next;
if (group != sd->groups)
--
2.13.1