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From: Morten Rasmussen <morten.rasmussen@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Henrik Austad <henrik@austad.us>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	"mingo@kernel.org" <mingo@kernel.org>,
	"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
	"vincent.guittot@linaro.org" <vincent.guittot@linaro.org>,
	"daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org>,
	"preeti@linux.vnet.ibm.com" <preeti@linux.vnet.ibm.com>,
	Dietmar Eggemann <Dietmar.Eggemann@arm.com>
Subject: Re: [RFC PATCH 02/16] sched: Introduce CONFIG_SCHED_ENERGY
Date: Tue, 10 Jun 2014 12:24:03 +0100	[thread overview]
Message-ID: <20140610112403.GC1581@e103034-lin> (raw)
In-Reply-To: <20140610102353.GC6758@twins.programming.kicks-ass.net>

On Tue, Jun 10, 2014 at 11:23:53AM +0100, Peter Zijlstra wrote:
> On Tue, Jun 10, 2014 at 11:06:41AM +0100, Morten Rasmussen wrote:
> > How would you like to disable the energy stuff for users for whom
> > latency is everything?
> > 
> > I mean, we are adding some extra load/utilization tracking. While I
> > think we should do everything possible to minimize the overhead, I think
> > it is unrealistic to assume that it will be zero. Is a some extra 'if
> > (energy_enabled)' acceptable?
> > 
> > I'm open for other suggestions.
> 
> We have the jump-label stuff to do self modifying code ;-) The only
> thing we need to be careful with is data-layout.

Thanks. I can see that it is already used in for various bit in
kernel/sched/*. I didn't catch anything in Documentation/static-keys.txt
related to data-layout caveats. Is there some other
documentation/patches I should read before messing everything up? ;-)

> So I'm _hoping_ we can do all this without more CONFIG knobs, because
> {PREEMPT*SMP*CGROUP^3*NUMA^2} is already entirely annoying to
> build and run test, not to mention that distro builds will have no other
> option than to enable everything anyhow.

Fair enough.

  parent reply	other threads:[~2014-06-10 11:24 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-23 18:16 [RFC PATCH 00/16] sched: Energy cost model for energy-aware scheduling Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 01/16] sched: Documentation for scheduler energy cost model Morten Rasmussen
2014-06-05  8:49   ` Vincent Guittot
2014-06-05 11:35     ` Morten Rasmussen
2014-06-05 15:02       ` Vincent Guittot
2014-05-23 18:16 ` [RFC PATCH 02/16] sched: Introduce CONFIG_SCHED_ENERGY Morten Rasmussen
2014-06-08  6:03   ` Henrik Austad
2014-06-09 10:20     ` Morten Rasmussen
2014-06-10  9:39       ` Peter Zijlstra
2014-06-10 10:06         ` Morten Rasmussen
2014-06-10 10:23           ` Peter Zijlstra
2014-06-10 11:17             ` Henrik Austad
2014-06-10 12:19               ` Peter Zijlstra
2014-06-10 11:24             ` Morten Rasmussen [this message]
2014-06-10 12:24               ` Peter Zijlstra
2014-06-10 14:41                 ` Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 03/16] sched: Introduce sd energy data structures Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 04/16] sched: Allocate and initialize sched energy Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 05/16] sched: Add sd energy procfs interface Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 06/16] arm: topology: Define TC2 sched energy and provide it to scheduler Morten Rasmussen
2014-05-30 12:04   ` Peter Zijlstra
2014-06-02 14:15     ` Morten Rasmussen
2014-06-03 11:41       ` Peter Zijlstra
2014-06-04 13:49         ` Morten Rasmussen
2014-06-03 11:44   ` Peter Zijlstra
2014-06-04 15:42     ` Morten Rasmussen
2014-06-04 16:16       ` Peter Zijlstra
2014-06-06 13:15         ` Morten Rasmussen
2014-06-06 13:43           ` Peter Zijlstra
2014-06-06 14:29             ` Morten Rasmussen
2014-06-12 15:05               ` Vince Weaver
2014-06-03 11:50   ` Peter Zijlstra
2014-06-04 16:02     ` Morten Rasmussen
2014-06-04 17:27       ` Peter Zijlstra
2014-06-04 21:56         ` Rafael J. Wysocki
2014-06-05  6:52           ` Peter Zijlstra
2014-06-05 15:03             ` Dirk Brandewie
2014-06-05 20:29               ` Yuyang Du
2014-06-06  8:05                 ` Peter Zijlstra
2014-06-06  0:35                   ` Yuyang Du
2014-06-06 10:50                     ` Peter Zijlstra
2014-06-06 12:13                       ` Ingo Molnar
2014-06-06 12:27                         ` Ingo Molnar
2014-06-06 14:11                           ` Morten Rasmussen
2014-06-07  2:33                           ` Nicolas Pitre
2014-06-09  8:27                             ` Morten Rasmussen
2014-06-09 13:22                               ` Nicolas Pitre
2014-06-11 11:02                                 ` Eduardo Valentin
2014-06-11 11:42                                   ` Morten Rasmussen
2014-06-11 11:43                                     ` Eduardo Valentin
2014-06-11 13:37                                       ` Morten Rasmussen
2014-06-07 23:53                         ` Yuyang Du
2014-06-07 23:26                       ` Yuyang Du
2014-06-09  8:59                         ` Morten Rasmussen
2014-06-09  2:15                           ` Yuyang Du
2014-06-10 10:16                         ` Peter Zijlstra
2014-06-10 17:01                           ` Nicolas Pitre
2014-06-10 18:35                           ` Yuyang Du
2014-06-06 16:27                     ` Jacob Pan
2014-06-06 13:03         ` Morten Rasmussen
2014-06-07  2:52         ` Nicolas Pitre
2014-05-23 18:16 ` [RFC PATCH 07/16] sched: Introduce system-wide sched_energy Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 08/16] sched: Introduce SD_SHARE_CAP_STATES sched_domain flag Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 09/16] sched, cpufreq: Introduce current cpu compute capacity into scheduler Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 10/16] sched, cpufreq: Current compute capacity hack for ARM TC2 Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 11/16] sched: Energy model functions Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 12/16] sched: Task wakeup tracking Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 13/16] sched: Take task wakeups into account in energy estimates Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 14/16] sched: Use energy model in select_idle_sibling Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 15/16] sched: Use energy to guide wakeup task placement Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 16/16] sched: Disable wake_affine to broaden the scope of wakeup target cpus Morten Rasmussen

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