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Message-ID: <570CE3F2.5000806@arm.com>
Date: Tue, 12 Apr 2016 13:02:58 +0100
From: Dietmar Eggemann <dietmar.eggemann@....com>
To: Yuyang Du <yuyang.du@...el.com>, peterz@...radead.org,
mingo@...nel.org, linux-kernel@...r.kernel.org
Cc: bsegall@...gle.com, pjt@...gle.com, morten.rasmussen@....com,
vincent.guittot@...aro.org, juri.lelli@....com
Subject: Re: [PATCH 2/4] sched/fair: Drop out incomplete current period when
sched averages accrue
On 10/04/16 23:36, Yuyang Du wrote:
[...]
> @@ -2704,11 +2694,14 @@ static __always_inline int
> __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
> unsigned long weight, int running, struct cfs_rq *cfs_rq)
> {
> - u64 delta, scaled_delta, periods;
> - u32 contrib;
> - unsigned int delta_w, scaled_delta_w, decayed = 0;
> + u64 delta;
> + u32 contrib, periods;
> unsigned long scale_freq, scale_cpu;
>
> + /*
> + * now rolls down to a period boundary
> + */
> + now = now && (u64)(~0xFFFFF);
This forces now to be 1.
s/&&/&
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