* LPC 2011 Power Management Session notes
@ 2011-09-09 0:28 Paul Walmsley
2011-09-09 8:09 ` Jean Pihet
0 siblings, 1 reply; 4+ messages in thread
From: Paul Walmsley @ 2011-09-09 0:28 UTC (permalink / raw)
To: linux-pm
Available at
http://pad.ubuntu.com/plumbers-2011-pwr-mgt
in real time if anyone's interested
- Paul
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: LPC 2011 Power Management Session notes
2011-09-09 0:28 LPC 2011 Power Management Session notes Paul Walmsley
@ 2011-09-09 8:09 ` Jean Pihet
2011-09-09 16:50 ` Mark Brown
2011-09-09 22:50 ` mark gross
0 siblings, 2 replies; 4+ messages in thread
From: Jean Pihet @ 2011-09-09 8:09 UTC (permalink / raw)
To: Paul Walmsley; +Cc: linux-pm
Hi,
On Fri, Sep 9, 2011 at 2:28 AM, Paul Walmsley <paul@pwsan.com> wrote:
>
> Available at
>
> http://pad.ubuntu.com/plumbers-2011-pwr-mgt
>
> in real time if anyone's interested
Thanks for the doc!
About the Device PM QoS user space interface:
1. Proposal: For every device, there will be a sysfs wakeup latency attribute
2. Proposal: Userspace processes should communicate their needs via sysfs
I assume there can be only one user app that can open a given sysfs
entry at a time, is that correct?
Let me think about it and propose a patch next week.
Regards,
Jean
>
>
> - Paul
> _______________________________________________
> linux-pm mailing list
> linux-pm@lists.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/linux-pm
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: LPC 2011 Power Management Session notes
2011-09-09 8:09 ` Jean Pihet
@ 2011-09-09 16:50 ` Mark Brown
2011-09-09 22:50 ` mark gross
1 sibling, 0 replies; 4+ messages in thread
From: Mark Brown @ 2011-09-09 16:50 UTC (permalink / raw)
To: Jean Pihet; +Cc: linux-pm
On Fri, Sep 09, 2011 at 10:09:48AM +0200, Jean Pihet wrote:
> On Fri, Sep 9, 2011 at 2:28 AM, Paul Walmsley <paul@pwsan.com> wrote:
> About the Device PM QoS user space interface:
> 1. Proposal: For every device, there will be a sysfs wakeup latency attribute
> 2. Proposal: Userspace processes should communicate their needs via sysfs
> I assume there can be only one user app that can open a given sysfs
> entry at a time, is that correct?
No, that's not the case. The file implementation doesn't get to see
opens and closes at all, it just gets passed buffers to fill or read
from.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: LPC 2011 Power Management Session notes
2011-09-09 8:09 ` Jean Pihet
2011-09-09 16:50 ` Mark Brown
@ 2011-09-09 22:50 ` mark gross
1 sibling, 0 replies; 4+ messages in thread
From: mark gross @ 2011-09-09 22:50 UTC (permalink / raw)
To: Jean Pihet; +Cc: linux-pm
On Fri, Sep 09, 2011 at 10:09:48AM +0200, Jean Pihet wrote:
> Hi,
>
> On Fri, Sep 9, 2011 at 2:28 AM, Paul Walmsley <paul@pwsan.com> wrote:
> >
> > Available at
> >
> > http://pad.ubuntu.com/plumbers-2011-pwr-mgt
> >
> > in real time if anyone's interested
> Thanks for the doc!
>
>
> About the Device PM QoS user space interface:
> 1. Proposal: For every device, there will be a sysfs wakeup latency attribute
> 2. Proposal: Userspace processes should communicate their needs via sysfs
>
> I assume there can be only one user app that can open a given sysfs
> entry at a time, is that correct?
>
> Let me think about it and propose a patch next week.
My recollection of the evening was that the exposing of per device qos
latencies was not considered a good idea without better articulation on
how it would be used. (or misused)
FWIW a few folks (ok maybe just me) are not comfortable with exposing
raw values without a good enough abstraction for them to user mode such
that the values used through that user mode ABI would be somewhat
portable between ISA's or even versions of the same chips / platforms.
--mark
> Regards,
> Jean
>
> >
> >
> > - Paul
> > _______________________________________________
> > linux-pm mailing list
> > linux-pm@lists.linux-foundation.org
> > https://lists.linux-foundation.org/mailman/listinfo/linux-pm
> >
> _______________________________________________
> linux-pm mailing list
> linux-pm@lists.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/linux-pm
^ permalink raw reply [flat|nested] 4+ messages in thread
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2011-09-09 0:28 LPC 2011 Power Management Session notes Paul Walmsley
2011-09-09 8:09 ` Jean Pihet
2011-09-09 16:50 ` Mark Brown
2011-09-09 22:50 ` mark gross
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