linux-kernel - [PATCH 02/13] hperf_hmp: introduce hew domain flag.

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Date:	Fri, 06 Nov 2015 15:02:36 +0300
From:	Arseniy Krasnov <a.krasnov@...sung.com>
To:	linux@....linux.org.uk, mingo@...hat.com, peterz@...radead.org
Cc:	a.krasnov@...sung.com, v.tyrtov@...sung.com,
	s.rogachev@...sung.com, linux-kernel@...r.kernel.org,
	Tarek Dakhran <t.dakhran@...sung.com>,
	Sergey Dyasly <s.dyasly@...sung.com>,
	Dmitriy Safonov <d.safonov@...tner.samsung.com>,
	Ilya Maximets <i.maximets@...sung.com>
Subject: [PATCH 02/13] hperf_hmp: introduce hew domain flag.

	New scheduler domain type: HMP. Each big.LITTLE cluster is detected by
scheduler as HMP domain. HPERF_HMP logic works between two HMP domains, the
default CFS logic, in turn, works inside the HMP domain.

Signed-off-by: Tarek Dakhran <t.dakhran@...sung.com>
Signed-off-by: Sergey Dyasly <s.dyasly@...sung.com>
Signed-off-by: Dmitriy Safonov <d.safonov@...tner.samsung.com>
Signed-off-by: Arseniy Krasnov <a.krasnov@...sung.com>
Signed-off-by: Ilya Maximets <i.maximets@...sung.com>
---
 arch/arm/kernel/topology.c | 6 +++++-
 include/linux/sched.h      | 4 ++++
 kernel/sched/core.c        | 9 ++++++++-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 08b7847..7fcc5fe 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -285,7 +285,11 @@ static struct sched_domain_topology_level arm_topology[] = {
 	{ cpu_corepower_mask, cpu_corepower_flags, SD_INIT_NAME(GMC) },
 	{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
 #endif
-	{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
+	{ cpu_cpu_mask,
+#ifdef CONFIG_HPERF_HMP
+	 .flags = SD_HMP_BALANCE,
+#endif
+	 SD_INIT_NAME(DIE)},
 	{ NULL, },
 };
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b7b9501..eb084df 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -990,6 +990,10 @@ extern void wake_up_q(struct wake_q_head *head);
 #define SD_OVERLAP		0x2000	/* sched_domains of this level overlap */
 #define SD_NUMA			0x4000	/* cross-node balancing */
 
+#ifdef CONFIG_HPERF_HMP
+#define SD_HMP_BALANCE		0x8000	/* Use HMP load balancing algorithm */
+#endif
+
 #ifdef CONFIG_SCHED_SMT
 static inline int cpu_smt_flags(void)
 {
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index bcd214e..16092e0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6410,6 +6410,9 @@ sd_init(struct sched_domain_topology_level *tl, int cpu)
 					| 0*SD_PREFER_SIBLING
 					| 0*SD_NUMA
 					| sd_flags
+#ifdef CONFIG_HPERF_HMP
+					| (tl->flags & SD_HMP_BALANCE)
+#endif
 					,
 
 		.last_balance		= jiffies,
@@ -6472,7 +6475,11 @@ static struct sched_domain_topology_level default_topology[] = {
 #ifdef CONFIG_SCHED_MC
 	{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
 #endif
-	{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
+	{ cpu_cpu_mask,
+#ifdef CONFIG_HPERF_HMP
+	 .flags = SD_HMP_BALANCE,
+#endif
+	 SD_INIT_NAME(DIE)},
 	{ NULL, },
 };
 
-- 
1.9.1

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