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Date: Mon, 7 Sep 2015 15:21:59 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Morten Rasmussen <morten.rasmussen@....com> Cc: mingo@...hat.com, vincent.guittot@...aro.org, daniel.lezcano@...aro.org, Dietmar Eggemann <Dietmar.Eggemann@....com>, yuyang.du@...el.com, mturquette@...libre.com, rjw@...ysocki.net, Juri Lelli <Juri.Lelli@....com>, sgurrappadi@...dia.com, pang.xunlei@....com.cn, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/6] sched/fair: Compute capacity invariant load/utilization tracking On Mon, Sep 07, 2015 at 02:42:20PM +0200, Peter Zijlstra wrote: > I'm of a mind to apply these patches; with two patches on top, which > I'll post shortly. --- Subject: sched: Rename scale() From: Peter Zijlstra <peterz@...radead.org> Date: Mon Sep 7 15:05:42 CEST 2015 Rename scale() to cap_scale() to better reflect its purpose, it is after all not a general purpose scale function, it has SCHED_CAPACITY_SHIFT hardcoded in it. Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> --- kernel/sched/fair.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2515,7 +2515,7 @@ static u32 __compute_runnable_contrib(u6 return contrib + runnable_avg_yN_sum[n]; } -#define scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT) +#define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT) /* * We can represent the historical contribution to runnable average as the @@ -2588,7 +2588,7 @@ __update_load_avg(u64 now, int cpu, stru * period and accrue it. */ delta_w = 1024 - delta_w; - scaled_delta_w = scale(delta_w, scale_freq); + scaled_delta_w = cap_scale(delta_w, scale_freq); if (weight) { sa->load_sum += weight * scaled_delta_w; if (cfs_rq) { @@ -2597,7 +2597,7 @@ __update_load_avg(u64 now, int cpu, stru } } if (running) - sa->util_sum += scale(scaled_delta_w, scale_cpu); + sa->util_sum += cap_scale(scaled_delta_w, scale_cpu); delta -= delta_w; @@ -2614,25 +2614,25 @@ __update_load_avg(u64 now, int cpu, stru /* Efficiently calculate \sum (1..n_period) 1024*y^i */ contrib = __compute_runnable_contrib(periods); - contrib = scale(contrib, scale_freq); + contrib = cap_scale(contrib, scale_freq); if (weight) { sa->load_sum += weight * contrib; if (cfs_rq) cfs_rq->runnable_load_sum += weight * contrib; } if (running) - sa->util_sum += scale(contrib, scale_cpu); + sa->util_sum += cap_scale(contrib, scale_cpu); } /* Remainder of delta accrued against u_0` */ - scaled_delta = scale(delta, scale_freq); + scaled_delta = cap_scale(delta, scale_freq); if (weight) { sa->load_sum += weight * scaled_delta; if (cfs_rq) cfs_rq->runnable_load_sum += weight * scaled_delta; } if (running) - sa->util_sum += scale(scaled_delta, scale_cpu); + sa->util_sum += cap_scale(scaled_delta, scale_cpu); sa->period_contrib += delta; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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