From: Peter Zijlstra <peterz@infradead.org>
To: Patrick Bellasi <patrick.bellasi@arm.com>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Paul Turner <pjt@google.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Juri Lelli <juri.lelli@redhat.com>, Todd Kjos <tkjos@android.com>,
Joel Fernandes <joelaf@google.com>,
Steve Muckle <smuckle@google.com>
Subject: Re: [PATCH v5 4/4] sched/fair: update util_est only on util_avg updates
Date: Thu, 8 Mar 2018 10:48:31 +0100 [thread overview]
Message-ID: <20180308094830.GK25201@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180222170153.673-5-patrick.bellasi@arm.com>
On Thu, Feb 22, 2018 at 05:01:53PM +0000, Patrick Bellasi wrote:
> +#define UTIL_EST_NEED_UPDATE_FLAG 0x1
> @@ -5321,12 +5345,19 @@ static inline void util_est_dequeue(struct cfs_rq *cfs_rq,
> if (!task_sleep)
> return;
>
> + /*
> + * Skip update of task's estimated utilization if the PELT signal has
> + * never been updated (at least once) since last enqueue time.
> + */
> + ue = READ_ONCE(p->se.avg.util_est);
> + if (ue.enqueued & UTIL_EST_NEED_UPDATE_FLAG)
> + return;
The name and function seem inverted, if the flag is set, we do _NOT_
update util_est.
How about something like UTIL_EST_UNCHANGED ? That would give:
/*
* If the PELT values haven't changed since enqueue time,
* skip the util_est update.
*/
if (enqueue & UTIL_EST_UNCHANGED)
return;
next prev parent reply other threads:[~2018-03-08 9:48 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-22 17:01 [PATCH v5 0/4] Utilization estimation (util_est) for FAIR tasks Patrick Bellasi
2018-02-22 17:01 ` [PATCH v5 1/4] sched/fair: add util_est on top of PELT Patrick Bellasi
2018-03-01 17:42 ` Patrick Bellasi
2018-03-06 18:56 ` Peter Zijlstra
2018-03-07 12:32 ` Patrick Bellasi
2018-03-06 18:58 ` Peter Zijlstra
2018-03-07 9:39 ` Peter Zijlstra
2018-03-07 15:37 ` Patrick Bellasi
2018-03-07 11:31 ` Patrick Bellasi
2018-03-07 12:24 ` Peter Zijlstra
2018-03-07 15:24 ` Patrick Bellasi
2018-03-07 17:35 ` Peter Zijlstra
2018-03-06 19:02 ` Peter Zijlstra
2018-03-07 11:47 ` Patrick Bellasi
2018-03-07 12:26 ` Peter Zijlstra
2018-03-07 15:16 ` Patrick Bellasi
2018-02-22 17:01 ` [PATCH v5 2/4] sched/fair: use util_est in LB and WU paths Patrick Bellasi
2018-02-22 17:01 ` [PATCH v5 3/4] sched/cpufreq_schedutil: use util_est for OPP selection Patrick Bellasi
2018-02-26 4:04 ` Viresh Kumar
2018-03-07 10:12 ` Peter Zijlstra
2018-02-22 17:01 ` [PATCH v5 4/4] sched/fair: update util_est only on util_avg updates Patrick Bellasi
2018-03-01 17:46 ` Patrick Bellasi
2018-03-07 10:38 ` Peter Zijlstra
2018-03-08 9:15 ` Peter Zijlstra
2018-03-08 9:48 ` Peter Zijlstra [this message]
2018-03-08 10:37 ` Patrick Bellasi
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