Write additional CPU topology info in sched_domain for our use in
cpu_attach_domain()
Signed-off-by: Yuyang Du <yuyang...@intel.com>
---
kernel/sched/core.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1cb7402..9df01d5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5496,6 +5496,31 @@ static void update_top_cache_domain(int cpu)
rcu_assign_pointer(per_cpu(sd_asym, cpu), sd);
}
+static void update_cpu_position_info(struct sched_domain *sd)
+{
+ while (sd) {
+ int i = 0, j = 0, first, min = INT_MAX;
+ struct sched_group *group;
+
+ group = sd->groups;
+ first = group_first_cpu(group);
+ do {
+ int k = group_first_cpu(group);
+ i += 1;
+ if (k < first)
+ j += 1;
+ if (k < min) {
+ sd->first_group = group;
+ min = k;
+ }
+ } while (group = group->next, group != sd->groups);
+
+ sd->total_groups = i;
+ sd->group_number = j;
+ sd = sd->parent;
+ }
+}
+
/*
* Attach the domain 'sd' to 'cpu' as its base domain. Callers must
* hold the hotplug lock.
@@ -5544,6 +5569,8 @@ cpu_attach_domain(struct sched_domain *sd, struct
root_domain *rd, int cpu)
destroy_sched_domains(tmp, cpu);
update_top_cache_domain(cpu);
+
+ update_cpu_position_info(sd);
}
/* cpus with isolated domains */
--
1.7.9.5
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