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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

[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

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

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