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From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Rik van Riel <riel@redhat.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linaro-kernel@lists.linaro.org
Subject: Re: [PATCH RFC] sched,idle: teach select_idle_sibling about idle states
Date: Fri, 03 Oct 2014 08:23:04 +0200	[thread overview]
Message-ID: <1412317384.5149.19.camel@marge.simpson.net> (raw)
In-Reply-To: <20141002131548.6cd377d5@cuia.bos.redhat.com>

On Thu, 2014-10-02 at 13:15 -0400, Rik van Riel wrote:

> Subject: sched,idle: teach select_idle_sibling about idle states
> 
> Change select_idle_sibling to take cpu idle exit latency into
> account.  First preference is to select the cpu with the lowest
> exit latency from a completely idle sched_group inside the CPU;
> if that is not available, we pick the CPU with the lowest exit
> latency in any sched_group.
> 
> This increases the total search time of select_idle_sibling,
> we may want to look into propagating load info up the sched_group
> tree in some way. That information would also be useful to prevent
> the wake_affine logic from causing a load imbalance between
> sched_groups.

A generic boo hiss aimed in the general direction of all of this let's
go look at every possibility on every wakeup stuff.  Less is more.

-Mike


  parent reply	other threads:[~2014-10-03  6:23 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-04 15:32 [PATCH v2 0/2] sched/idle : find the best idle CPU with cpuidle info Nicolas Pitre
2014-09-04 15:32 ` [PATCH v2 1/2] sched: let the scheduler see CPU idle states Nicolas Pitre
2014-09-18 17:37   ` Paul E. McKenney
2014-09-18 17:39     ` Paul E. McKenney
2014-09-18 23:15       ` Peter Zijlstra
2014-09-18 18:32     ` Nicolas Pitre
2014-09-18 23:17       ` Peter Zijlstra
2014-09-18 23:28         ` Peter Zijlstra
2014-09-19 18:30           ` Nicolas Pitre
2014-09-04 15:32 ` [PATCH v2 2/2] sched/fair: leverage the idle state info when choosing the "idlest" cpu Nicolas Pitre
2014-09-05  7:52   ` Daniel Lezcano
2014-09-18 23:46   ` Peter Zijlstra
2014-09-19  0:05   ` Peter Zijlstra
2014-09-19  4:49   ` Yao Dongdong
2014-09-19  4:49     ` Yao Dongdong
2014-09-30 21:58   ` Rik van Riel
2014-09-30 23:15     ` Nicolas Pitre
2014-10-02 17:15       ` [PATCH RFC] sched,idle: teach select_idle_sibling about idle states Rik van Riel
2014-10-03  6:04         ` Mike Galbraith
2014-10-03  6:23         ` Mike Galbraith [this message]
2014-10-03  7:50           ` Peter Zijlstra
2014-10-03 13:05             ` Mike Galbraith
2014-10-03 14:28             ` Rik van Riel
2014-10-03 14:46               ` Peter Zijlstra
2014-10-03 15:37                 ` Rik van Riel
2014-10-09 16:04                   ` Peter Zijlstra
2014-10-03 18:52               ` Nicolas Pitre
2014-09-10 21:35 ` [PATCH v2 0/2] sched/idle : find the best idle CPU with cpuidle info Nicolas Pitre
2014-09-10 22:50   ` Rafael J. Wysocki
2014-09-10 23:25     ` Nicolas Pitre
2014-09-10 23:28       ` Nicolas Pitre
2014-09-10 23:50       ` Rafael J. Wysocki
2014-09-18  0:39   ` Nicolas Pitre
2014-09-18 23:24     ` Peter Zijlstra
2014-09-19 18:22       ` Nicolas Pitre

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