linux-kernel - [PATCH 1/2] sched/fair: make capacity_margin __read

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Message-Id: <1506121484-8260-1-git-send-email-leo.yan@linaro.org>
Date:   Sat, 23 Sep 2017 07:04:43 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Chris Redpath <Chris.Redpath@....com>,
        Joel Fernandes <joelaf@...gle.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 1/2] sched/fair: make capacity_margin __read_mostly

Variable 'capacity_margin' is used with read operation for most cases
to calculate the capacity margin, put it into __read_mostly section.

Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Morten Rasmussen <morten.rasmussen@....com>
Cc: Chris Redpath <Chris.Redpath@....com>
Cc: Joel Fernandes <joelaf@...gle.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 70ba32e..ad03bf4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -129,7 +129,7 @@ unsigned int sysctl_sched_cfs_bandwidth_slice		= 5000UL;
  *
  * (default: ~20%)
  */
-unsigned int capacity_margin				= 1280;
+unsigned int capacity_margin __read_mostly		= 1280;
 
 static inline void update_load_add(struct load_weight *lw, unsigned long inc)
 {
-- 
2.7.4