linux-kernel - [RFC v6 5/5] powerpc: Set turbo domain to NUMA node for task packing

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Date:   Tue, 21 Jan 2020 12:03:07 +0530
From:   Parth Shah <parth@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, patrick.bellasi@...bug.net,
        valentin.schneider@....com, pavel@....cz, dsmythies@...us.net,
        qperret@...gle.com, tim.c.chen@...ux.intel.com
Subject: [RFC v6 5/5] powerpc: Set turbo domain to NUMA node for task packing

Provide an powerpc architecture specific implementation for defining the
turbo domain to make searching of the core to be bound within the NUMA.

The POWER9 systems have a pair of cores in the LLC domain. Hence to make
TurboSched more effective, increase the domain space for task packing
to search within NUMA domain.

Signed-off-by: Parth Shah <parth@...ux.ibm.com>
---
 arch/powerpc/include/asm/topology.h | 3 +++
 arch/powerpc/kernel/smp.c           | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 2f7e1ea5089e..83adfb99f8ba 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -138,6 +138,9 @@ static inline void shared_proc_topology_init(void) {}
 #define topology_sibling_cpumask(cpu)	(per_cpu(cpu_sibling_map, cpu))
 #define topology_core_cpumask(cpu)	(per_cpu(cpu_core_map, cpu))
 #define topology_core_id(cpu)		(cpu_to_core_id(cpu))
+#define arch_turbo_domain		powerpc_turbo_domain
+
+struct cpumask *powerpc_turbo_domain(int cpu);
 
 int dlpar_cpu_readd(int cpu);
 #endif
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index ea6adbf6a221..0fc4443a3f27 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1169,6 +1169,13 @@ static void remove_cpu_from_masks(int cpu)
 }
 #endif
 
+#ifdef CONFIG_SCHED_SMT
+inline struct cpumask *powerpc_turbo_domain(int cpu)
+{
+	return cpumask_of_node(cpu_to_node(cpu));
+}
+#endif
+
 static inline void add_cpu_to_smallcore_masks(int cpu)
 {
 	struct cpumask *this_l1_cache_map = per_cpu(cpu_l1_cache_map, cpu);
-- 
2.17.2