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From: Peter Zijlstra <peterz@infradead.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Paul Turner <pjt@google.com>,
	Morten Rasmussen <Morten.Rasmussen@arm.com>,
	Chris Metcalf <cmetcalf@tilera.com>,
	Tony Luck <tony.luck@intel.com>,
	"alex.shi@intel.com" <alex.shi@intel.com>,
	Preeti U Murthy <preeti@linux.vnet.ibm.com>,
	linaro-kernel <linaro-kernel@lists.linaro.org>,
	"len.brown@intel.com" <len.brown@intel.com>,
	l.majewski@samsung.com, Jonathan Corbet <corbet@lwn.net>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	Paul McKenney <paulmck@linux.vnet.ibm.com>,
	Arjan van de Ven <arjan@linux.intel.com>,
	linux-pm@vger.kernel.org
Subject: Re: [RFC][PATCH v5 00/14] sched: packing tasks
Date: Mon, 11 Nov 2013 17:36:30 +0100	[thread overview]
Message-ID: <20131111163630.GD26898@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CAHkRjk69GNYtLGBSWCNcsCzkBHywKrD0qQQbNkJRpMbcdsCPyw@mail.gmail.com>

On Mon, Nov 11, 2013 at 11:33:45AM +0000, Catalin Marinas wrote:

tl;dr :-) Still trying to wrap my head around how to do that weird
topology Vincent raised..

> Question for Peter/Ingo: do you want the scheduler to decide on which
> C-state a CPU should be in or we still leave this to a cpuidle
> layer/driver?

I think the can leave most of that in a driver; right along with how to
prod the hardware to actually get into that state.

I think the most important parts are what is now 'generic' code; stuff
that guestimates the idle-time and so forth.

I think the scheduler simply wants to say: we expect to go idle for X
ns, we want a guaranteed wakeup latency of Y ns -- go do your thing.

I think you also raised the point in that we do want some feedback as to
the cost of waking up particular cores to better make decisions on which
to wake. That is indeed so.

  reply	other threads:[~2013-11-11 16:37 UTC|newest]

Thread overview: 101+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-18 11:52 [RFC][PATCH v5 00/14] sched: packing tasks Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 01/14] sched: add a new arch_sd_local_flags for sched_domain init Vincent Guittot
2013-11-05 14:06   ` Peter Zijlstra
2013-11-05 14:57     ` Vincent Guittot
2013-11-05 22:27       ` Peter Zijlstra
2013-11-06 10:10         ` Vincent Guittot
2013-11-06 13:53         ` Martin Schwidefsky
2013-11-06 14:08           ` Peter Zijlstra
2013-11-12 17:43             ` Dietmar Eggemann
2013-11-12 18:08               ` Peter Zijlstra
2013-11-13 15:47                 ` Dietmar Eggemann
2013-11-13 16:29                   ` Peter Zijlstra
2013-11-14 10:49                     ` Morten Rasmussen
2013-11-14 12:07                       ` Peter Zijlstra
2013-12-18 13:13         ` [RFC] sched: CPU topology try Vincent Guittot
2013-12-23 17:22           ` Dietmar Eggemann
2014-01-06 13:41             ` Vincent Guittot
2014-01-06 16:31               ` Peter Zijlstra
2014-01-07  8:32                 ` Vincent Guittot
2014-01-07 13:22                   ` Peter Zijlstra
2014-01-07 14:10                     ` Peter Zijlstra
2014-01-07 15:41                       ` Morten Rasmussen
2014-01-07 20:49                         ` Peter Zijlstra
2014-01-08  8:32                           ` Alex Shi
2014-01-08  8:37                             ` Peter Zijlstra
2014-01-08 12:52                               ` Morten Rasmussen
2014-01-08 13:04                                 ` Peter Zijlstra
2014-01-08 13:33                                   ` Morten Rasmussen
2014-01-08 12:35                           ` Morten Rasmussen
2014-01-08 12:42                             ` Peter Zijlstra
2014-01-08 12:45                             ` Peter Zijlstra
2014-01-08 13:27                               ` Morten Rasmussen
2014-01-08 13:32                                 ` Peter Zijlstra
2014-01-08 13:45                                   ` Morten Rasmussen
2014-01-07 14:11                     ` Vincent Guittot
2014-01-07 15:37                       ` Morten Rasmussen
2014-01-08  8:37                         ` Alex Shi
2014-01-06 16:28             ` Peter Zijlstra
2014-01-06 17:15               ` Morten Rasmussen
2014-01-07  9:57                 ` Peter Zijlstra
2014-01-01  5:00           ` Preeti U Murthy
2014-01-06 16:33             ` Peter Zijlstra
2014-01-06 16:37               ` Arjan van de Ven
2014-01-06 16:48                 ` Peter Zijlstra
2014-01-06 16:54                   ` Peter Zijlstra
2014-01-06 17:13                     ` Arjan van de Ven
2014-01-07 12:40             ` Vincent Guittot
2014-01-06 16:21           ` Peter Zijlstra
2014-01-07  8:22             ` Vincent Guittot
2014-01-07  9:40           ` Preeti U Murthy
2014-01-07  9:50             ` Peter Zijlstra
2014-01-07 10:39               ` Preeti U Murthy
2014-01-07 11:13                 ` Peter Zijlstra
2014-01-07 16:31                   ` Preeti U Murthy
2014-01-07 11:20                 ` Morten Rasmussen
2014-01-07 12:31                 ` Vincent Guittot
2014-01-07 16:51                   ` Preeti U Murthy
2013-10-18 11:52 ` [RFC][PATCH v5 03/14] sched: define pack buddy CPUs Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 04/14] sched: do load balance only with packing cpus Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 05/14] sched: add a packing level knob Vincent Guittot
2013-11-12 10:32   ` Peter Zijlstra
2013-11-12 10:44     ` Vincent Guittot
2013-11-12 10:55       ` Peter Zijlstra
2013-11-12 10:57         ` Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 06/14] sched: create a new field with available capacity Vincent Guittot
2013-11-12 10:34   ` Peter Zijlstra
2013-11-12 11:05     ` Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 07/14] sched: get CPU's activity statistic Vincent Guittot
2013-11-12 10:36   ` Peter Zijlstra
2013-11-12 10:41   ` Peter Zijlstra
2013-10-18 11:52 ` [RFC][PATCH v5 08/14] sched: move load idx selection in find_idlest_group Vincent Guittot
2013-11-12 10:49   ` Peter Zijlstra
2013-11-27 14:10   ` [tip:sched/core] sched/fair: Move " tip-bot for Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 09/14] sched: update the packing cpu list Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 10/14] sched: init this_load to max in find_idlest_group Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 11/14] sched: add a SCHED_PACKING_TASKS config Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 12/14] sched: create a statistic structure Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 13/14] sched: differantiate idle cpu Vincent Guittot
2013-10-18 11:52 ` [RFC][PATCH v5 14/14] cpuidle: set the current wake up latency Vincent Guittot
2013-11-11 11:33 ` [RFC][PATCH v5 00/14] sched: packing tasks Catalin Marinas
2013-11-11 16:36   ` Peter Zijlstra [this message]
2013-11-11 16:39     ` Arjan van de Ven
2013-11-11 18:18       ` Catalin Marinas
2013-11-11 18:20         ` Arjan van de Ven
2013-11-12 12:06         ` Morten Rasmussen
2013-11-12 16:48         ` Arjan van de Ven
2013-11-12 23:14           ` Catalin Marinas
2013-11-13 16:13             ` Arjan van de Ven
2013-11-13 16:45               ` Catalin Marinas
2013-11-13 17:56                 ` Arjan van de Ven
2013-11-12 17:40     ` Catalin Marinas
2013-11-25 18:55     ` Daniel Lezcano
2013-11-11 16:38   ` Peter Zijlstra
2013-11-11 16:40     ` Arjan van de Ven
2013-11-12 10:36     ` Vincent Guittot
2013-11-11 16:54   ` Morten Rasmussen
2013-11-11 18:31     ` Catalin Marinas
2013-11-11 19:26       ` Arjan van de Ven
2013-11-11 22:43         ` Nicolas Pitre
2013-11-11 23:43         ` Catalin Marinas
2013-11-12 12:35   ` Vincent Guittot

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