linux-kernel - [PATCH v3 06/12] sched: add per rq cpu_power

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Message-Id: <1404144343-18720-7-git-send-email-vincent.guittot@linaro.org>
Date:	Mon, 30 Jun 2014 18:05:37 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	peterz@...radead.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org
Cc:	preeti@...ux.vnet.ibm.com, Morten.Rasmussen@....com, efault@....de,
	nicolas.pitre@...aro.org, linaro-kernel@...ts.linaro.org,
	daniel.lezcano@...aro.org, dietmar.eggemann@....com,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH v3 06/12] sched: add per rq cpu_power_orig

This new field cpu_power_orig reflects the available capacity of a CPUs unlike
the cpu_power which reflects the current capacity that can be altered by
frequency and rt tasks.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 kernel/sched/core.c  | 2 +-
 kernel/sched/fair.c  | 1 +
 kernel/sched/sched.h | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 54f5722..92dd6d1 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6964,7 +6964,7 @@ void __init sched_init(void)
 #ifdef CONFIG_SMP
 		rq->sd = NULL;
 		rq->rd = NULL;
-		rq->cpu_capacity = SCHED_CAPACITY_SCALE;
+		rq->cpu_capacity = rq->cpu_capacity_orig = SCHED_CAPACITY_SCALE;
 		rq->post_schedule = 0;
 		rq->active_balance = 0;
 		rq->next_balance = jiffies;
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f0bba5f..7dff578 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5671,6 +5671,7 @@ static void update_cpu_capacity(struct sched_domain *sd, int cpu)
 
 	capacity >>= SCHED_CAPACITY_SHIFT;
 
+	cpu_rq(cpu)->cpu_capacity_orig = capacity;
 	sdg->sgc->capacity_orig = capacity;
 
 	if (sched_feat(ARCH_CAPACITY))
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 2f86361..7b311de 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -568,6 +568,7 @@ struct rq {
 	struct sched_domain *sd;
 
 	unsigned long cpu_capacity;
+	unsigned long cpu_capacity_orig;
 
 	unsigned char idle_balance;
 	/* For active balancing */
-- 
1.9.1

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