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310 discussions

[RFC 0/6] scheduler-based cpu frequency scaling

by Michael Turquette

This series implements an event-driven cpufreq governor that scales cpu frequency as a function of cfs runqueue utilization. The intent of this RFC is to get some discussion going about how the scheduler can become the policy engine for selecting cpu frequency, what limitations exist and what design do we want to take to get to a solution. This series depends on having frequency-invariant representations for load. This requires Vincent's recently merged cpu capacity rework patches, as well as two patches posted by Morten in his energy aware scheduling v3 series. The latter two patches are included in this series for posterity, but discussion around them probably belongs in the v3 eas series or the forthcoming v4 series. Thanks to Juri Lelli <juri.lelli(a)arm.com> for contributing to the development of the governor. A git branch with these patches can be pulled from here: https://git.linaro.org/people/mike.turquette/linux.git sched-freq Smoke testing has been done on an OMAP4 Pandaboard and an Exynos 5800 Chromebook2. ---8<--- eas-dev, Please let me know what you think of this series, including code as well as cover letter and commitlog text. I was not able to finish the irq_work additions to the governor in time for me to submit this tonight (these changes remove the periodic behavior of calling cap_gov_kick_thread from run_rebalance_domains). I'll focus on the irq_work stuff tomorrow and post an addenedum to this series asap. I have not done any benchmark testing with this series. That is also on my todo list for this week and any help there would be appreciated. Freedom & Howard, if you are bored and feel like measuring power across some benchmarks on your non-buggy EVBs then please do. I can only measure power on the A53s right now which limits me to a single cluster with two cores. Regards, Mike Michael Turquette (4): sched: sched feature for cpu frequency selection cpufreq: add per-governor private data sched: export get_cpu_usage in sched.h sched: cap_gov: PELT-based cpu frequency scaling Morten Rasmussen (2): cpufreq: Architecture specific callback for frequency changes arm: Frequency invariant scheduler load-tracking support arch/arm/include/asm/topology.h | 4 + arch/arm/kernel/topology.c | 41 +++++ drivers/cpufreq/Kconfig | 22 +++ drivers/cpufreq/cpufreq.c | 13 +- include/linux/cpufreq.h | 6 + kernel/sched/Makefile | 1 + kernel/sched/cap_gov.c | 361 ++++++++++++++++++++++++++++++++++++++++ kernel/sched/fair.c | 26 ++- kernel/sched/features.h | 6 + kernel/sched/sched.h | 10 ++ 10 files changed, 488 insertions(+), 2 deletions(-) create mode 100644 kernel/sched/cap_gov.c -- 1.9.1

11 years, 5 months

eas-dev stripping people from cc

by Morten Rasmussen

Hi, It seems that eas-dev is stripping people on cc in certain cases. When I receive copies of my own replies the topic is prefixed with "[Eas-dev]" and the cc list only contains eas-dev itself. Is that a deliberate choice? IMHO it would be better to keep the cc list in case you want to reply to your own messages. It also looks like people are removed from to/cc when others reply to messages received through the list (not in to/cc). Thanks, Morten

11 years, 5 months

sched-freq dependencies

by Mike Turquette

Hi Juri & Morten, Thanks for taking the quick call today. Here are some of the patches from the EAS V3 which I think are outstanding dependencies for sched-freq to be posted on LKML: #4 "sched: Make sched entity usage tracking frequency-invariant" #11 "sched: Make load tracking frequency scale-invariant" #13 "cpufreq: Architecture specific callback for frequency changes" Vincent's fix for setting current freq (should be rolled into #13 above): https://git.linaro.org/people/vincent.guittot/kernel.git/commitdiff/3ac2b6a… #14 "arm: Frequency invariant scheduler load-tracking support" Let me know what you think. Regards, Mike

11 years, 5 months

Re: [Eas-dev] Invitation: sched-dvfs design discussion - Mer. 18 Mars 2015 15:30 - 16:30 (Daniel Lezcano)

by Daniel Lezcano

I have an appointment at this time. Is it possible to delay *2* hours after ? -- Daniel On 03/18/2015 06:29 AM, Mike Turquette wrote: > plus d'infos » > <https://www.google.com/calendar/event?action=VIEW&eid=a2s1amRldW4zY28yMTdlY…> > > > sched-dvfs design discussion > > Link to Google HO is in the meeting details. If that doesn't work for > everyone then we can use some teleconf method. > > The main purpose of the call is to discuss: > 1) locking issues around get_cpu_usage > 2) the polling nature of the current governor code and its implications > 3) designing for the non-blocking DVFS case and for unification of task > placement and frequency selection decisions > > /Date/ > Mer. 18 Mars 2015 15:30 – 16:30 Paris > /Appel vidéo/ > https://plus.google.com/hangouts/_/linaro.org/sched-dvfs > <https://plus.google.com/hangouts/_/linaro.org/sched-dvfs?hceid=bWlrZS50dXJx…> > /Agenda/ > Daniel Lezcano > /Participants/ > > • > Mike Turquette- organisateur > • > Morten Rasmussen > • > Amit Kucheria > • > Daniel Lezcano > • > eas-dev(a)lists.linaro.org > • > Vincent Guittot > • > dietmar.eggemann(a)arm.com > • > Juri Lelli > > Allez-vous participer ? *Oui > <https://www.google.com/calendar/event?action=RESPOND&eid=a2s1amRldW4zY28yMT…>- > Peut-être > <https://www.google.com/calendar/event?action=RESPOND&eid=a2s1amRldW4zY28yMT…>- > Non > <https://www.google.com/calendar/event?action=RESPOND&eid=a2s1amRldW4zY28yMT…>* > plus d'options » > <https://www.google.com/calendar/event?action=VIEW&eid=a2s1amRldW4zY28yMTdlY…> > > Invitation de Google Agenda <https://www.google.com/calendar/> > > Vous recevez ce message à l'adresse daniel.lezcano(a)linaro.org, car vous > êtes abonné aux invitations dans l'agenda Daniel Lezcano. > > Pour ne plus recevoir ces e-mails, veuillez vous connecter à > https://www.google.com/calendar/ et modifier vos paramètres de > notification pour cet agenda. > -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog

11 years, 6 months

ARM Workload Automation now opensource

by Ian Rickards

FYI, this week ARM opensourced the Workload Automation suite that is useful for EAS evaluation License is Apache ver 2.0 https://github.com/ARM-software/workload-automation (see README for details) -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782

11 years, 6 months

EAS backport trees

by Juri Lelli

Hi Amit, since I've got a backport of EASv3 and I'd like to share this with all, can you please give me an update about the EAS backport tree maintenance bits we agreed upon. Thanks a lot, - Juri

11 years, 6 months

Re: [Eas-dev] Invitation: sched-dvfs design discussion - Mer. 18 Mars 2015 15:30 - 16:30 (Vincent Guittot)

by Vincent Guittot

Hi Mike, Is it possible to delay the meeting by 1 hour ? I have another internal meeting during the same timeslot Regards, Vincent 2015-03-18 6:29 GMT+01:00 Mike Turquette <mike.turquette(a)linaro.org>: > plus d'infos >> > <https://www.google.com/calendar/event?action=VIEW&eid=a2s1amRldW4zY28yMTdlY…> > sched-dvfs design discussion > Link to Google HO is in the meeting details. If that doesn't work for > everyone then we can use some teleconf method. > > The main purpose of the call is to discuss: > 1) locking issues around get_cpu_usage > 2) the polling nature of the current governor code and its implications > 3) designing for the non-blocking DVFS case and for unification of task > placement and frequency selection decisions > *Date* > Mer. 18 Mars 2015 15:30 - 16:30 Paris > *Appel vidéo* > https://plus.google.com/hangouts/_/linaro.org/sched-dvfs > <https://plus.google.com/hangouts/_/linaro.org/sched-dvfs?hceid=bWlrZS50dXJx…> > *Agenda* > Vincent Guittot > *Participants* > * > Mike Turquette- organisateur > * > Amit Kucheria > * > Morten Rasmussen > * > Vincent Guittot > * > dietmar.eggemann(a)arm.com > * > Daniel Lezcano > * > Juri Lelli > * > eas-dev(a)lists.linaro.org > > Allez-vous participer ? *Oui > <https://www.google.com/calendar/event?action=RESPOND&eid=a2s1amRldW4zY28yMT…> > - Peut-être > <https://www.google.com/calendar/event?action=RESPOND&eid=a2s1amRldW4zY28yMT…> > - Non > <https://www.google.com/calendar/event?action=RESPOND&eid=a2s1amRldW4zY28yMT…>* > plus d'options >> > <https://www.google.com/calendar/event?action=VIEW&eid=a2s1amRldW4zY28yMTdlY…> > > Invitation de Google Agenda <https://www.google.com/calendar/> > > Vous recevez ce message à l'adresse vincent.guittot(a)linaro.org, car vous > êtes abonné aux invitations dans l'agenda Vincent Guittot. > > Pour ne plus recevoir ces e-mails, veuillez vous connecter à > https://www.google.com/calendar/ et modifier vos paramètres de > notification pour cet agenda. >

11 years, 6 months

Updated Invitation: sched-dvfs design discussion @ Wed 2015-03-18 9:30am - 10:30am (Mike Turquette)

by mike.turquette＠linaro.org

This event has been changed. Title: sched-dvfs design discussion Link to Google HO is in the meeting details. If that doesn't work for everyone then we can use some teleconf method. The main purpose of the call is to discuss: 1) locking issues around get_cpu_usage 2) the polling nature of the current governor code and its implications 3) designing for the non-blocking DVFS case and for unification of task placement and frequency selection decisions When: Wed 2015-03-18 9:30am - 10:30am Pacific Time (changed) Video call: https://plus.google.com/hangouts/_/linaro.org/sched-dvfs <https://plus.google.com/hangouts/_/linaro.org/sched-dvfs?hceid=bWlrZS50dXJx…> Calendar: Mike Turquette Who: * Mike Turquette - organizer * Morten Rasmussen * Amit Kucheria * eas-dev(a)lists.linaro.org * Vincent Guittot * Juri Lelli * Daniel Lezcano * dietmar.eggemann(a)arm.com Event details: https://www.google.com/calendar/event?action=VIEW&eid=a2s1amRldW4zY28yMTdlY… Invitation from Google Calendar: https://www.google.com/calendar/ You are receiving this courtesy email at the account eas-dev(a)lists.linaro.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://www.google.com/calendar/ and control your notification settings for your entire calendar.

11 years, 6 months

[PATCH 0/6] scheduler-driven cpu frequency scaling

by Juri Lelli

Hi all, as agreed with Mike, I'm posting here his sched-dvfs patchset [1] plus my EAS bindings to make it use the energy model. This is meant to re-start discussion on the attempt to drive dvfs directly from the scheduler. This patchset is based on 4.0-rc2 + EASv3 [2]. Mike is already working on a slightly different, more "reactive", approach. The way we can use EAS infrastructure shouldn't change much anyway, so this works also as a first example of such thing. The core of my little delta resides in the possibility to read the energy tables to get freq and uarch invariance in the new governor (4/6) and the use of get_cpu_usage() to get the utilization signal from the scheduler (that I squashed in 02/06 together with some little fixes). Best, - Juri [1] https://lkml.org/lkml/2014/10/22/21 [2] https://lkml.org/lkml/2015/2/4/537 Juri Lelli (3): sched/energy_model: use EAS energy model sched/energy_model: bound kthreads to run on related_cpus sched/energy_model: fix spurious kicks Michael Turquette (1): sched: cfs: cpu frequency scaling based on task placement Mike Turquette (2): cpufreq: add per-governor private data sched: energy_model: simple cpu frequency scaling policy drivers/cpufreq/Kconfig | 21 +++ include/linux/cpufreq.h | 6 + kernel/sched/Makefile | 1 + kernel/sched/energy_model.c | 364 ++++++++++++++++++++++++++++++++++++++++++++ kernel/sched/fair.c | 51 ++++++- kernel/sched/sched.h | 5 + 6 files changed, 441 insertions(+), 7 deletions(-) create mode 100644 kernel/sched/energy_model.c -- 2.2.2

11 years, 6 months

Invitation: sched-dvfs design discussion @ Wed 2015-03-18 7:30am - 8:30am (Mike Turquette)

by Mike Turquette

You have been invited to the following event. Title: sched-dvfs design discussion Link to Google HO is in the meeting details. If that doesn't work for everyone then we can use some teleconf method. The main purpose of the call is to discuss: 1) locking issues around get_cpu_usage 2) the polling nature of the current governor code and its implications 3) designing for the non-blocking DVFS case and for unification of task placement and frequency selection decisions When: Wed 2015-03-18 7:30am - 8:30am Pacific Time Video call: https://plus.google.com/hangouts/_/linaro.org/sched-dvfs <https://plus.google.com/hangouts/_/linaro.org/sched-dvfs?hceid=bWlrZS50dXJx…> Calendar: Mike Turquette Who: * Mike Turquette - organizer * Morten Rasmussen * Amit Kucheria * eas-dev(a)lists.linaro.org * Vincent Guittot * Juri Lelli * Daniel Lezcano * dietmar.eggemann(a)arm.com Event details: https://www.google.com/calendar/event?action=VIEW&eid=a2s1amRldW4zY28yMTdlY… Invitation from Google Calendar: https://www.google.com/calendar/ You are receiving this courtesy email at the account eas-dev(a)lists.linaro.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://www.google.com/calendar/ and control your notification settings for your entire calendar.

11 years, 6 months

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