From: Preeti U Murthy <preeti@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
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, arjan@linux.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: Tue, 07 Jan 2014 16:09:39 +0530 [thread overview]
Message-ID: <52CBD96B.4050103@linux.vnet.ibm.com> (raw)
In-Reply-To: <20140107095039.GA2480@laptop.programming.kicks-ass.net>
On 01/07/2014 03:20 PM, Peter Zijlstra wrote:
> On Tue, Jan 07, 2014 at 03:10:21PM +0530, Preeti U Murthy wrote:
>> What if we want to add arch specific flags to the NUMA domain? Currently
>> with Peter's patch:https://lkml.org/lkml/2013/11/5/239 and this patch,
>> the arch can modify the sd flags of the topology levels till just before
>> the NUMA domain. In sd_init_numa(), the flags for the NUMA domain get
>> initialized. We need to perhaps call into arch here to probe for
>> additional flags?
>
> What are you thinking of? I was hoping all NUMA details were captured in
> the distance table.
>
> Its far easier to talk of specifics in this case.
>
If the processor can be core gated, then there is very little power
savings that we could yield from consolidating all the load onto a
single node in a NUMA domain. 6 cores on one node or 3 cores each on two
nodes, the power is drawn by 6 cores in all. So I was thinking under
this circumstance we might want to set the SD_SHARE_POWERDOMAIN flag at
the NUMA domain and spread the load if it favours the workload.
Regards
Preeti U Murthy
next prev parent reply other threads:[~2014-01-07 10:43 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 [this message]
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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