linux-kernel - [RFC PATCH 5/9] sched: Define macro for number of CPUs in core

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Message-Id: <20190830174944.21741-6-subhra.mazumdar@oracle.com>
Date:   Fri, 30 Aug 2019 10:49:40 -0700
From:   subhra mazumdar <subhra.mazumdar@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com, tglx@...utronix.de,
        steven.sistare@...cle.com, dhaval.giani@...cle.com,
        daniel.lezcano@...aro.org, vincent.guittot@...aro.org,
        viresh.kumar@...aro.org, tim.c.chen@...ux.intel.com,
        mgorman@...hsingularity.net, parth@...ux.ibm.com,
        patrick.bellasi@....com
Subject: [RFC PATCH 5/9] sched: Define macro for number of CPUs in core

Introduce macro topology_sibling_weight for number of sibling CPUs in a
core and use in select_idle_cpu

Signed-off-by: subhra mazumdar <subhra.mazumdar@...cle.com>
---
 include/linux/topology.h | 4 ++++
 kernel/sched/fair.c      | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/topology.h b/include/linux/topology.h
index cb0775e..a85aea1 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -190,6 +190,10 @@ static inline int cpu_to_mem(int cpu)
 #ifndef topology_sibling_cpumask
 #define topology_sibling_cpumask(cpu)		cpumask_of(cpu)
 #endif
+#ifndef topology_sibling_weight
+#define topology_sibling_weight(cpu)	\
+		cpumask_weight(topology_sibling_cpumask(cpu))
+#endif
 #ifndef topology_core_cpumask
 #define topology_core_cpumask(cpu)		cpumask_of(cpu)
 #endif
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 23ec9c6..8856503 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6205,7 +6205,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
 		return -1;
 
 	if (sched_feat(SIS_PROP)) {
-		floor = cpumask_weight(topology_sibling_cpumask(target));
+		floor = topology_sibling_weight(target);
 		if (floor < 2)
 			floor = 2;
 		nr = (p->latency_nice * sd->span_weight) / LATENCY_NICE_MAX;
-- 
2.9.3