linux-kernel - [tip:sched/core] sched: Pass 'struct rq' to nohz_idle

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Date:	Mon, 13 Jan 2014 07:56:27 -0800
From:	tip-bot for Daniel Lezcano <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, tglx@...utronix.de, daniel.lezcano@...aro.org
Subject: [tip:sched/core] sched: Pass 'struct rq' to nohz_idle_balance()

Commit-ID:  208cb16ba325552a3935bfc002e34561b0d512d7
Gitweb:     http://git.kernel.org/tip/208cb16ba325552a3935bfc002e34561b0d512d7
Author:     Daniel Lezcano <daniel.lezcano@...aro.org>
AuthorDate: Mon, 6 Jan 2014 12:34:44 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 13 Jan 2014 13:47:33 +0100

sched: Pass 'struct rq' to nohz_idle_balance()

The cpu information is stored in the struct rq. Pass the struct rq to
nohz_idle_balance, so all the functions called in run_rebalance_domains have
the same parameters and the 'this_cpu' variable becomes pointless.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
[ Added !SMP build fix. ]
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1389008085-9069-8-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ff4e0df..d7220d1 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6740,9 +6740,9 @@ out:
  * In CONFIG_NO_HZ_COMMON case, the idle balance kickee will do the
  * rebalancing for all the cpus for whom scheduler ticks are stopped.
  */
-static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle)
+static void nohz_idle_balance(struct rq *this_rq, enum cpu_idle_type idle)
 {
-	struct rq *this_rq = cpu_rq(this_cpu);
+	int this_cpu = this_rq->cpu;
 	struct rq *rq;
 	int balance_cpu;
 
@@ -6844,7 +6844,7 @@ need_kick:
 	return 1;
 }
 #else
-static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle) { }
+static void nohz_idle_balance(struct rq *this_rq, enum cpu_idle_type idle) { }
 #endif
 
 /*
@@ -6853,8 +6853,7 @@ static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle) { }
  */
 static void run_rebalance_domains(struct softirq_action *h)
 {
-	int this_cpu = smp_processor_id();
-	struct rq *this_rq = cpu_rq(this_cpu);
+	struct rq *this_rq = this_rq();
 	enum cpu_idle_type idle = this_rq->idle_balance ?
 						CPU_IDLE : CPU_NOT_IDLE;
 
@@ -6865,7 +6864,7 @@ static void run_rebalance_domains(struct softirq_action *h)
 	 * balancing on behalf of the other idle cpus whose ticks are
 	 * stopped.
 	 */
-	nohz_idle_balance(this_cpu, idle);
+	nohz_idle_balance(this_rq, idle);
 }
 
 static inline int on_null_domain(struct rq *rq)
--
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