[PATCH 0/8] device async action mechanism

[PATCH 0/8] device async action mechanism

[Zhang Rui]

Hi,

this is the patch set I made to speed up the device
suspend/resume/shutdown process.

A new mechanism called Device Async Actions is introduced in this patch set.
The basic idea is that,
1. device declares to support certain kinds of device async action,
   like suspend, resume, shutdown, etc.
2. a async domain is create for this device
3. the child device inherits the async domain
4. devices in the same domain suspend/resume/shutdown asynchronously with
   the other devices.

Currently, in order to make sure that it won't bring any side effects,
I only convert the ACPI battery and i8042 to use this framework, which reduces
0.5s+ S3 time(suspend time plus resume time), from 7.0s to less than 6.5s.
and about 0.5s shutdown time in my test.

Any comments are welcome. :)

thanks,
rui


 drivers/acpi/battery.c      |   13 +++
 drivers/base/Makefile       |    3 +-
 drivers/base/async_dev.c    |  210 +++++++++++++++++++++++++++++++++++++++++++
 drivers/base/core.c         |   16 +++-
 drivers/base/power/main.c   |   10 ++-
 drivers/input/serio/i8042.c |   10 ++-
 include/linux/async.h       |    3 +
 include/linux/async_dev.h   |   45 +++++++++
 include/linux/device.h      |    2 +
 9 files changed, 306 insertions(+), 6 deletions(-)

Re: [PATCH 0/8] device async action mechanism

[Pavel Machek]

Hi!

I notice you are still ccing my @suse.cz address. That one no longer
works :-(. 

> this is the patch set I made to speed up the device
> suspend/resume/shutdown process.
> 
> A new mechanism called Device Async Actions is introduced in this patch set.
> The basic idea is that,
> 1. device declares to support certain kinds of device async action,
>    like suspend, resume, shutdown, etc.
> 2. a async domain is create for this device
> 3. the child device inherits the async domain
> 4. devices in the same domain suspend/resume/shutdown asynchronously with
>    the other devices.
> 
> Currently, in order to make sure that it won't bring any side effects,
> I only convert the ACPI battery and i8042 to use this framework, which reduces
> 0.5s+ S3 time(suspend time plus resume time)???, from 7.0s to less than 6.5s.
> and about 0.5s shutdown time in my test.

Hmm, 7seconds is still quite long. What hw is that?

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

Re: [PATCH 0/8] device async action mechanism

[Zhang Rui]

On Wed, 2009-07-15 at 08:29 +0800, Pavel Machek wrote:
> Hi!
> 
> I notice you are still ccing my @suse.cz address. That one no longer
> works :-(. 
> 
> > this is the patch set I made to speed up the device
> > suspend/resume/shutdown process.
> > 
> > A new mechanism called Device Async Actions is introduced in this patch set.
> > The basic idea is that,
> > 1. device declares to support certain kinds of device async action,
> >    like suspend, resume, shutdown, etc.
> > 2. a async domain is create for this device
> > 3. the child device inherits the async domain
> > 4. devices in the same domain suspend/resume/shutdown asynchronously with
> >    the other devices.
> > 
> > Currently, in order to make sure that it won't bring any side effects,
> > I only convert the ACPI battery and i8042 to use this framework, which reduces
> > 0.5s+ S3 time(suspend time plus resume time)???, from 7.0s to less than 6.5s.
> > and about 0.5s shutdown time in my test.
> 
> Hmm, 7seconds is still quite long. What hw is that?
> 
7 seconds including both kernel suspend and resume time.
it takes about 3.2s to suspend and 3.8 seconds to resume.

thanks,
rui

Re: [PATCH 0/8] device async action mechanism

[Andi Kleen]

Zhang Rui <rui.zhang@intel.com> writes:
>
> Currently, in order to make sure that it won't bring any side effects,
> I only convert the ACPI battery and i8042 to use this framework, which reduces
> 0.5s+ S3 time(suspend time plus resume time), from 7.0s to less than 6.5s.

10.5s+ was intended I guess?

-Andi

-- 
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Re: [PATCH 0/8] device async action mechanism

[Zhang Rui]

On Wed, 2009-07-15 at 18:41 +0800, Andi Kleen wrote:
> Zhang Rui <rui.zhang@intel.com> writes:
> >
> > Currently, in order to make sure that it won't bring any side effects,
> > I only convert the ACPI battery and i8042 to use this framework, which reduces
> > 0.5s+ S3 time(suspend time plus resume time), from 7.0s to less than 6.5s.
> 
> 10.5s+ was intended I guess?
> 
what do you mean?

the kernel device suspend time is reduced from 3.2s to 2.8s after
applying this patch set in my test box.
And I get more optimistic numbers on another laptop, an Eeepc 901,
from about 2s to 1.6s. And the shutdown time is also reduced 0.4s.

thanks,
rui

Re: [PATCH 0/8] device async action mechanism

[Andi Kleen]

On Thu, Jul 16, 2009 at 10:14:43AM +0800, Zhang Rui wrote:
> On Wed, 2009-07-15 at 18:41 +0800, Andi Kleen wrote:
> > Zhang Rui <rui.zhang@intel.com> writes:
> > >
> > > Currently, in order to make sure that it won't bring any side effects,
> > > I only convert the ACPI battery and i8042 to use this framework, which reduces
> > > 0.5s+ S3 time(suspend time plus resume time), from 7.0s to less than 6.5s.
> > 
> > 10.5s+ was intended I guess?
> > 
> what do you mean?

I am confused by you writing

"reduces <small number> from <much larger number> to <still larger number>"

So I assumed you dropped a decimal on <small number>


> 
> the kernel device suspend time is reduced from 3.2s to 2.8s after
> applying this patch set in my test box.
> And I get more optimistic numbers on another laptop, an Eeepc 901,
> from about 2s to 1.6s. And the shutdown time is also reduced 0.4s.


I think I am still confused by your numbers.

How do the 0.5s and the 7.0s relate?

-Andi

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Re: [PATCH 0/8] device async action mechanism

[Zhang Rui]

On Thu, 2009-07-16 at 16:07 +0800, Andi Kleen wrote:
> On Thu, Jul 16, 2009 at 10:14:43AM +0800, Zhang Rui wrote:
> > On Wed, 2009-07-15 at 18:41 +0800, Andi Kleen wrote:
> > > Zhang Rui <rui.zhang@intel.com> writes:
> > > >
> > > > Currently, in order to make sure that it won't bring any side effects,
> > > > I only convert the ACPI battery and i8042 to use this framework, which reduces
> > > > 0.5s+ S3 time(suspend time plus resume time), from 7.0s to less than 6.5s.

> > > 
> > > 10.5s+ was intended I guess?
> > > 
> > what do you mean?
> 
> I am confused by you writing
> 
> "reduces <small number> from <much larger number> to <still larger number>"
> 
> So I assumed you dropped a decimal on <small number>
> 
sorry for my poor English.

I mean the total S3 time (including kernel suspend and kernel resume)
reduces more than 0.5 second.
it takes 7.0s without this patch set and now it takes only 6.5s.

thanks,
rui

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Re: [PATCH 0/8] device async action mechanism

[Henrique de Moraes Holschuh]

On Thu, 16 Jul 2009, Zhang Rui wrote:
> the kernel device suspend time is reduced from 3.2s to 2.8s after
> applying this patch set in my test box.

It will give even a bigger boot time saving on ThinkPads, where there is a
Synaptics (or ALPS if you are unlucky) touchpad with the trackpoint behind
it... it takes about 2s to init both devices here.  That's two seconds of
boot time you can shove off if it is being initialized assyncronously :-)

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

Re: [PATCH 0/8] device async action mechanism

[Arjan van de Ven]

Henrique de Moraes Holschuh wrote:
> On Thu, 16 Jul 2009, Zhang Rui wrote:
>> the kernel device suspend time is reduced from 3.2s to 2.8s after
>> applying this patch set in my test box.
> 
> It will give even a bigger boot time saving on ThinkPads, where there is a
> Synaptics (or ALPS if you are unlucky) touchpad with the trackpoint behind
> it... it takes about 2s to init both devices here.  That's two seconds of
> boot time you can shove off if it is being initialized assyncronously :-)
> 

that's a different problem that I don't think this will solve; as long
as you keep the boot of the kernel wait for all async actions, you're going
to hit that wait. In Moblin we have a (bad) patch to not do the wait,
at some point we need to figure how to get a mainline-able patch....

Re: [PATCH 0/8] device async action mechanism

[Fabio Comolli]

On Thu, Jul 16, 2009 at 3:45 PM, Arjan van de Ven<arjan@linux.intel.com> wrote:
> Henrique de Moraes Holschuh wrote:
>>
>> On Thu, 16 Jul 2009, Zhang Rui wrote:
>>>
>>> the kernel device suspend time is reduced from 3.2s to 2.8s after
>>> applying this patch set in my test box.
>>
>> It will give even a bigger boot time saving on ThinkPads, where there is a
>> Synaptics (or ALPS if you are unlucky) touchpad with the trackpoint behind
>> it... it takes about 2s to init both devices here.  That's two seconds of
>> boot time you can shove off if it is being initialized assyncronously :-)
>>
>
> that's a different problem that I don't think this will solve; as long
> as you keep the boot of the kernel wait for all async actions, you're going
> to hit that wait. In Moblin we have a (bad) patch to not do the wait,
> at some point we need to figure how to get a mainline-able patch....
> --

Is it possible for you to post that patch (or point to a website hosting it)?



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Re: [PATCH 0/8] device async action mechanism

[Zhang Rui]

On Thu, 2009-07-16 at 21:45 +0800, Arjan van de Ven wrote:
> Henrique de Moraes Holschuh wrote:
> > On Thu, 16 Jul 2009, Zhang Rui wrote:
> >> the kernel device suspend time is reduced from 3.2s to 2.8s after
> >> applying this patch set in my test box.
> > 
> > It will give even a bigger boot time saving on ThinkPads, where there is a
> > Synaptics (or ALPS if you are unlucky) touchpad with the trackpoint behind
> > it... it takes about 2s to init both devices here.  That's two seconds of
> > boot time you can shove off if it is being initialized assyncronously :-)
> > 
> 
> that's a different problem that I don't think this will solve;

right.
we are not able to get an async device group during initialization.

thanks,
rui

>  as long
> as you keep the boot of the kernel wait for all async actions, you're going
> to hit that wait. In Moblin we have a (bad) patch to not do the wait,
> at some point we need to figure how to get a mainline-able patch....