linux-kernel - Re: [PATCH v8 2/4] sched: Rewrite runnable load and utilization average tracking

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Date:	Thu, 28 May 2015 06:36:16 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Paul Turner <pjt@...gle.com>,
	Benjamin Segall <bsegall@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	arjan.van.de.ven@...el.com, Len Brown <len.brown@...el.com>,
	rafael.j.wysocki@...el.com,
	"fengguang.wu@...el.com" <fengguang.wu@...el.com>
Subject: Re: [PATCH v8 2/4] sched: Rewrite runnable load and utilization
 average tracking

On Tue, May 26, 2015 at 06:06:23PM +0200, Vincent Guittot wrote:
> > +               sa->util_sum = decay_load(u64(sa->util_sum), periods + 1);
> 
> Brackets are missing around u64 to cast util_sum
> 

My appology for this, and thank you, Vincent.

Sending the below patch here instead of sending the series.

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2dd201e..a8fd7b9 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2584,7 +2584,7 @@ static __always_inline int __update_load_avg(u64 now, int cpu,
 		delta %= 1024;
 
 		sa->load_sum = decay_load(sa->load_sum, periods + 1);
-		sa->util_sum = decay_load(u64(sa->util_sum), periods + 1);
+		sa->util_sum = decay_load((u64)(sa->util_sum), periods + 1);
 
 		/* Efficiently calculate \sum (1..n_period) 1024*y^i */
 		contrib = __compute_runnable_contrib(periods);
--
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