From: Mel Gorman <mgorman@techsingularity.net>
To: "Li, Aubrey" <aubrey.li@linux.intel.com>
Cc: Barry Song <song.bao.hua@hisilicon.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Peter Ziljstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Valentin Schneider <valentin.schneider@arm.com>,
Linux-ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 2/4] sched/fair: Move avg_scan_cost calculations under SIS_PROP
Date: Wed, 9 Dec 2020 09:05:07 +0000 [thread overview]
Message-ID: <20201209090507.GM3371@techsingularity.net> (raw)
In-Reply-To: <3255625e-fa92-dc09-9fab-5621122f4af0@linux.intel.com>
On Wed, Dec 09, 2020 at 01:28:11PM +0800, Li, Aubrey wrote:
> >> nr = div_u64(span_avg, avg_cost);
> >> else
> >> nr = 4;
> >> - }
> >> -
> >> - time = cpu_clock(this);
> >>
> >> - cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr);
> >> + time = cpu_clock(this);
> >> + }
> >>
> >> for_each_cpu_wrap(cpu, cpus, target) {
> >> if (!--nr)
>
> nr is the key of this throttling mechanism, need to be placed under sched_feat(SIS_PROP) as well.
>
It isn't necessary as nr in initialised to INT_MAX if !SIS_PROP.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2020-12-09 9:06 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-08 15:34 [PATCH 0/4] Reduce scanning of runqueues in select_idle_sibling Mel Gorman
2020-12-08 15:34 ` [PATCH 1/4] sched/fair: Remove SIS_AVG_CPU Mel Gorman
2020-12-08 16:13 ` Vincent Guittot
2020-12-08 15:34 ` [PATCH 2/4] sched/fair: Move avg_scan_cost calculations under SIS_PROP Mel Gorman
2020-12-08 16:03 ` Vincent Guittot
2020-12-08 16:30 ` Mel Gorman
2020-12-09 5:28 ` Li, Aubrey
2020-12-09 9:05 ` Mel Gorman [this message]
2020-12-09 11:07 ` Li, Aubrey
2020-12-09 11:33 ` Mel Gorman
2020-12-10 5:18 ` Li, Aubrey
2020-12-10 9:32 ` Mel Gorman
2020-12-08 15:35 ` [PATCH 3/4] sched/fair: Do not replace recent_used_cpu with the new target Mel Gorman
2020-12-08 16:14 ` Vincent Guittot
2020-12-10 9:40 ` Vincent Guittot
2020-12-11 6:25 ` Hillf Danton
2020-12-11 9:02 ` Mel Gorman
2020-12-11 9:34 ` Hillf Danton
2020-12-11 9:45 ` Mel Gorman
2020-12-08 15:35 ` [PATCH 4/4] sched/fair: Return an idle cpu if one is found after a failed search for an idle core Mel Gorman
2020-12-08 16:15 ` Vincent Guittot
2020-12-09 14:37 ` [PATCH 0/4] Reduce scanning of runqueues in select_idle_sibling Mel Gorman
2020-12-10 8:00 ` Vincent Guittot
2020-12-10 9:38 ` Vincent Guittot
2020-12-10 11:04 ` Mel Gorman
2020-12-11 9:51 ` Vincent Guittot
2020-12-11 10:23 ` Mel Gorman
2020-12-12 10:02 ` Vincent Guittot
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