2008-06-25 18:45:40

by Len Brown

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Subject: Linux Power Management Mini-Summit -- Ottawa -- July 22, 2008

This is an open invitation to participate in
a Linux Power Management mini-summit
9AM Tuesday July 22, 2008 in Ottawa.

This is the day before the Ottawa Linux Symposium.
OLS is generously supporting Linux mini-summits by providing the room
and projector: http://www.linuxsymposium.org/2008/minisummits.php

The meeting format will be round-table discussion.
There will be no phone bridge or audio/video recording.
However, there will be written minutes as there
were last year: http://lwn.net/Articles/249019

Send suggestions for topics to [email protected],
whether you plan to attend or not. The attendees will
form the agenda by consensus at the start of the session.

If you would like to attend, please send a note to
[email protected] announcing your intent,
and what you would like to discuss.

Last year we were were cautious about presentations, for fear they
would not support discussion. But the short ones we had actually
facilitied discussion, so we'll allow them again this year.

thanks,
-Len

ps. There is an opportunity for your company to help sponsor
the event -- for right now we are on our own for food.
If you are interseted, please contact me and OLS.


2008-06-25 20:14:54

by Rafael J. Wysocki

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Subject: Re: Linux Power Management Mini-Summit -- Ottawa -- July 22, 2008

On Wednesday, 25 of June 2008, Len Brown wrote:
> This is an open invitation to participate in
> a Linux Power Management mini-summit
> 9AM Tuesday July 22, 2008 in Ottawa.
>
> This is the day before the Ottawa Linux Symposium.
> OLS is generously supporting Linux mini-summits by providing the room
> and projector: http://www.linuxsymposium.org/2008/minisummits.php
>
> The meeting format will be round-table discussion.
> There will be no phone bridge or audio/video recording.
> However, there will be written minutes as there
> were last year: http://lwn.net/Articles/249019
>
> Send suggestions for topics to [email protected],
> whether you plan to attend or not. The attendees will
> form the agenda by consensus at the start of the session.
>
> If you would like to attend, please send a note to
> [email protected] announcing your intent,
> and what you would like to discuss.

I would like to attend and I'd like to discuss the new framework for suspending
and resuming devices and related things (like example implemetations of the
new callbacks, the handling of wake-up etc.).

Thanks,
Rafael

2008-06-26 13:06:44

by Nigel Cunningham

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Subject: Re: [linux-pm] Linux Power Management Mini-Summit -- Ottawa -- July 22, 2008

Hi.

On Wed, 2008-06-25 at 14:44 -0400, Len Brown wrote:
> This is an open invitation to participate in
> a Linux Power Management mini-summit
> 9AM Tuesday July 22, 2008 in Ottawa.
>
> This is the day before the Ottawa Linux Symposium.
> OLS is generously supporting Linux mini-summits by providing the room
> and projector: http://www.linuxsymposium.org/2008/minisummits.php
>
> The meeting format will be round-table discussion.
> There will be no phone bridge or audio/video recording.
> However, there will be written minutes as there
> were last year: http://lwn.net/Articles/249019
>
> Send suggestions for topics to [email protected],
> whether you plan to attend or not. The attendees will
> form the agenda by consensus at the start of the session.
>
> If you would like to attend, please send a note to
> [email protected] announcing your intent,
> and what you would like to discuss.
>
> Last year we were were cautious about presentations, for fear they
> would not support discussion. But the short ones we had actually
> facilitied discussion, so we'll allow them again this year.
>
> thanks,
> -Len
>
> ps. There is an opportunity for your company to help sponsor
> the event -- for right now we are on our own for food.
> If you are interseted, please contact me and OLS.

All I can say is "Have fun, guys." I'm interested in developments, and
would love to contribute but there's no way I'd be able to get there and
I have little time to do anything.

I'd be interested (of course) to hear the fruit of discussions re
hibernation.

Regards,

Nigel

2008-06-26 14:08:20

by Alan Stern

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Subject: Re: [linux-pm] Linux Power Management Mini-Summit -- Ottawa -- July 22, 2008

On Wed, 25 Jun 2008, Len Brown wrote:

> If you would like to attend, please send a note to
> [email protected] announcing your intent,
> and what you would like to discuss.

I plan to attend, and my proposed topic is Runtime PM implementation.

Alan Stern

2008-06-26 18:07:01

by Rafael J. Wysocki

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Subject: Re: [linux-pm] Linux Power Management Mini-Summit -- Ottawa -- July 22, 2008

On Thursday, 26 of June 2008, Alan Stern wrote:
> On Wed, 25 Jun 2008, Len Brown wrote:
>
> > If you would like to attend, please send a note to
> > [email protected] announcing your intent,
> > and what you would like to discuss.
>
> I plan to attend, and my proposed topic is Runtime PM implementation.

That sounds interesting. :-)

Rafael

2008-06-30 23:12:58

by Woodruff, Richard

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Subject: RE: [linux-pm] Linux Power Management Mini-Summit -- Ottawa -- July 22, 2008

> Send suggestions for topics to [email protected],
> whether you plan to attend or not. The attendees will
> form the agenda by consensus at the start of the session.
>
> If you would like to attend, please send a note to
> [email protected] announcing your intent,
> and what you would like to discuss.

I would like to attend.

Main topics of interest would be run time PM.

We currently have ARM systems using cpuidle and going to 0v with full context loss between dynamic ticks. There are a few areas it would be nice to get feed back on some hacks have had to be employed to get reasonable performance.

For example:
- we are saving driver state based on aggressive clock disables in drivers and only restoring context back on enable on control or event paths. Doing this at the bottom of a driver stack like MMC means you don't always have good knowledge of what the stack has in store. As such we add some activity timers to smooth it out. But it would be nice to have some kind of idea about upper layer activity.

- With dynamic tick running you find needless one shot timer reprogramming (mainly from high interrupts during idle). This can overflow the timer posting buffer and stall the MPU to a slower clock domain. This results in really bad throughput. Just keeping user space active and the periodic timer running instead of 1-shot will result in much better performance.

- How to account for demoted C-States? Right now if a CPUIDLE BM check forces a state reduction compared to the menu governor chosen C-State there is no path to allow for residency accounting for the actual state entered.

Thanks,
Richard W.

2008-07-08 14:22:01

by Pavel Machek

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Subject: Re: Linux Power Management Mini-Summit -- Ottawa -- July 22, 2008

On Wed 2008-06-25 14:44:01, Len Brown wrote:
> This is an open invitation to participate in
> a Linux Power Management mini-summit
> 9AM Tuesday July 22, 2008 in Ottawa.

I will not be able to make it :-(.

Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html