linux-kernel - [RFC patch 1/4] sched: change cfs

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Date:	Fri,  7 Jun 2013 15:29:26 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, bp@...en8.de, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, morten.rasmussen@....com
Cc:	vincent.guittot@...aro.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	alex.shi@...el.com, mgorman@...e.de, riel@...hat.com,
	wangyun@...ux.vnet.ibm.com, Jason Low <jason.low2@...com>
Subject: [RFC patch 1/4] sched: change cfs_rq load avg to unsigned long

Since the 'u64 runnable_load_avg, blocked_load_avg' in cfs_rq struct are
smaller than 'unsigned long' cfs_rq->load.weight. We don't need u64
vaiables to describe them. unsigned long is more efficient and convenience.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 kernel/sched/debug.c | 4 ++--
 kernel/sched/sched.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 75024a6..160afdc 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -211,9 +211,9 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 	SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
 #ifdef CONFIG_FAIR_GROUP_SCHED
 #ifdef CONFIG_SMP
-	SEQ_printf(m, "  .%-30s: %lld\n", "runnable_load_avg",
+	SEQ_printf(m, "  .%-30s: %ld\n", "runnable_load_avg",
 			cfs_rq->runnable_load_avg);
-	SEQ_printf(m, "  .%-30s: %lld\n", "blocked_load_avg",
+	SEQ_printf(m, "  .%-30s: %ld\n", "blocked_load_avg",
 			cfs_rq->blocked_load_avg);
 	SEQ_printf(m, "  .%-30s: %lld\n", "tg_load_avg",
 			(unsigned long long)atomic64_read(&cfs_rq->tg->load_avg));
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 8bc66c6..5a80943 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -277,7 +277,7 @@ struct cfs_rq {
 	 * This allows for the description of both thread and group usage (in
 	 * the FAIR_GROUP_SCHED case).
 	 */
-	u64 runnable_load_avg, blocked_load_avg;
+	unsigned long runnable_load_avg, blocked_load_avg;
 	atomic64_t decay_counter, removed_load;
 	u64 last_decay;
 
-- 
1.7.12

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