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Subject[PATCH v2 3/6] sched/deadline: Add dl_bw_capacity()
Date
Capacity-aware SCHED_DEADLINE admission control needs rd (root domain)
CPU capacity sum.

The design of this function follows that of dl_bw_cpus().

That is, return the rd CPU capacity sum in case the rd span a subset of
the cpu_active_mask.

Compute the CPU capacity sum over rd span and cpu_active_mask when in
hotplug.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
---
kernel/sched/deadline.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 4ae22bfc37ae..eb23e6921d94 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -69,6 +69,25 @@ static inline int dl_bw_cpus(int i)

return cpus;
}
+
+static inline unsigned long dl_bw_capacity(int i)
+{
+ struct root_domain *rd = cpu_rq(i)->rd;
+ unsigned long cap;
+
+ RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
+ "sched RCU must be held");
+
+ if (cpumask_subset(rd->span, cpu_active_mask))
+ return rd->sum_cpu_capacity;
+
+ cap = 0;
+
+ for_each_cpu_and(i, rd->span, cpu_active_mask)
+ cap += capacity_orig_of(i);
+
+ return cap;
+}
#else
static inline struct dl_bw *dl_bw_of(int i)
{
@@ -79,6 +98,11 @@ static inline int dl_bw_cpus(int i)
{
return 1;
}
+
+static inline unsigned long dl_bw_capacity(int i)
+{
+ return SCHED_CAPACITY_SCALE;
+}
#endif

static inline
--
2.17.1
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