From: Arjan van de Ven <arjan@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
linux-kernel@vger.kernel.org, mingo@kernel.org, pjt@google.com,
Morten.Rasmussen@arm.com, cmetcalf@tilera.com,
tony.luck@intel.com, alex.shi@linaro.org,
linaro-kernel@lists.linaro.org, rjw@sisk.pl,
paulmck@linux.vnet.ibm.com, corbet@lwn.net, tglx@linutronix.de,
len.brown@intel.com, amit.kucheria@linaro.org,
james.hogan@imgtec.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, Dietmar.Eggemann@arm.com
Subject: Re: [RFC] sched: CPU topology try
Date: Mon, 06 Jan 2014 08:37:13 -0800 [thread overview]
Message-ID: <52CADBB9.1010704@linux.intel.com> (raw)
In-Reply-To: <20140106163341.GO31570@twins.programming.kicks-ass.net>
On 1/6/2014 8:33 AM, Peter Zijlstra wrote:
> On Wed, Jan 01, 2014 at 10:30:33AM +0530, Preeti U Murthy wrote:
>> The design looks good to me. In my opinion information like P-states and
>> C-states dependency can be kept separate from the topology levels, it
>> might get too complicated unless the information is tightly coupled to
>> the topology.
>
> I'm not entirely convinced we can keep them separated, the moment we
> have multiple CPUs sharing a P or C state we need somewhere to manage
> the shared state and the domain tree seems like the most natural place
> for this.
>
> Now it might well be both P and C states operate at 'natural' domains
> which we already have so it might be 'easy'.
more than that though.. P and C state sharing is mostly hidden from the OS
(because the OS does not have the ability to do this; e.g. there are things
that do "if THIS cpu goes idle, the OTHER cpu P state changes automatic".
that's not just on x86, the ARM guys (iirc at least the latest snapdragon) are going in that
direction as well.....
for those systems, the OS really should just make local decisions and let the hardware
cope with hardware grouping.
>
next prev parent reply other threads:[~2014-01-06 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 [this message]
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
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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