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.dakh...@samsung.com>
Signed-off-by: Sergey Dyasly <s.dya...@samsung.com>
Signed-off-by: Dmitriy Safonov <d.safo...@partner.samsung.com>
Signed-off-by: Arseniy Krasnov <a.kras...@samsung.com>
Signed-off-by: Ilya Maximets <i.maxim...@samsung.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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