linux-kernel - [PATCH 03/13] hperf_hmp: add sched domains initialization.

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Date:	Fri, 06 Nov 2015 15:02:37 +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 03/13] hperf_hmp: add sched domains initialization.

	Attaching CPU clusters as 'sched_group' to HMP domains. Each HMP domain
has two pointers to A15 and A7 scheduling groups(struct sched_group).

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>
---
 include/linux/sched.h |  4 ++++
 kernel/sched/core.c   | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index eb084df..aa72125 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1057,6 +1057,10 @@ struct sched_domain {
 	u64 max_newidle_lb_cost;
 	unsigned long next_decay_max_lb_cost;
 
+#ifdef CONFIG_HPERF_HMP
+	struct sched_group *a15_group;
+	struct sched_group *a7_group;
+#endif
 #ifdef CONFIG_SCHEDSTATS
 	/* load_balance() stats */
 	unsigned int lb_count[CPU_MAX_IDLE_TYPES];
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 16092e0..e3a632f 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -90,6 +90,16 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/sched.h>
 
+#ifdef CONFIG_HPERF_HMP
+/* cpumask for A15 cpus */
+static DECLARE_BITMAP(cpu_fastest_bits, CONFIG_NR_CPUS);
+struct cpumask *cpu_fastest_mask = to_cpumask(cpu_fastest_bits);
+
+/* cpumask for A7 cpus */
+static DECLARE_BITMAP(cpu_slowest_bits, CONFIG_NR_CPUS);
+struct cpumask *cpu_slowest_mask = to_cpumask(cpu_slowest_bits);
+#endif
+
 DEFINE_MUTEX(sched_domains_mutex);
 DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
 
@@ -6971,6 +6981,45 @@ static int build_sched_domains(const struct cpumask *cpu_map,
 		sd = *per_cpu_ptr(d.sd, i);
 		cpu_attach_domain(sd, d.rd, i);
 	}
+
+#ifdef CONFIG_HPERF_HMP
+	for (i = nr_cpumask_bits - 1; i >= 0; i--) {
+		if (!cpumask_test_cpu(i, cpu_map))
+			continue;
+
+		for (sd = *per_cpu_ptr(d.sd, i); sd; sd = sd->parent) {
+			struct sched_group *sg;
+			sd->a7_group = NULL;
+			sd->a15_group = NULL;
+
+			/* Process only HMP domains */
+			if (!(sd->flags & SD_HMP_BALANCE))
+				continue;
+
+			/*
+			 * Process sched groups of this domain.
+			 * Attach sg to hmp domains.
+			 */
+			sg = sd->groups;
+			do {
+				if (!sg->sgc)
+					goto next_sg;
+#ifdef CONFIG_SCHED_DEBUG
+				printk(KERN_EMERG "Attaching CPUs 0x%08lX to domain %s\n",
+				       sched_group_cpus(sg)->bits[0], sd->name);
+#endif
+				if (cpumask_intersects(sched_group_cpus(sg),
+							cpu_fastest_mask))
+					sd->a15_group = sg;
+				else
+					sd->a7_group = sg;
+next_sg:
+				sg = sg->next;
+			} while (sg != sd->groups);
+		}
+	}
+#endif /* CONFIG_HPERF_HMP */
+
 	rcu_read_unlock();
 
 	ret = 0;
-- 
1.9.1

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