Interested in taking up a project

Interested in taking up a project

[Abhinav Gupta]

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Hi,

  I am interested in doing the following project for Xen, Introducing
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
PowerClamp-like
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
driver for
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
Xen
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
 (http://
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
wiki.xenproject.org
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
/wiki/
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
Xen
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
_Development_
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
Projects#Introducing
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
_
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
PowerClamp-like
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
_driver_for_
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
Xen
<http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>),
if it is still open.

About me: I'm pursuing my undergraduate studies in Mathematics and
Computing, from IIT BHU. I'm from India.


Please let me know if it is possible for me to take this project.

Thanks,

Abhinav

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Re: Interested in taking up a project

[Wei Liu]

You should CC the respective technical contact George Dunlap. I've done
this for you now.

On Fri, Jun 19, 2015 at 07:02:55AM +0000, Abhinav Gupta wrote:
> Hi,
> 
>   I am interested in doing the following project for Xen, Introducing
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> PowerClamp-like
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> driver for
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> Xen
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
>  (http://
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> wiki.xenproject.org
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> /wiki/
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> Xen
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> _Development_
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> Projects#Introducing
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> _
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> PowerClamp-like
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> _driver_for_
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>
> Xen
> <http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen>),
> if it is still open.
> 
> About me: I'm pursuing my undergraduate studies in Mathematics and
> Computing, from IIT BHU. I'm from India.
> 
> 
> Please let me know if it is possible for me to take this project.
> 
> Thanks,
> 
> Abhinav

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

Re: Interested in taking up a project

[Wei Liu]

Please use "reply to all" and don't top-post. I added xen-devel@ back to
CC list.

On Fri, Jun 19, 2015 at 10:40:48AM +0000, Abhinav Gupta wrote:
> Thanks
> I need one more suggestion.. Any specific IDE that can help me in the
> process of development?
> 

I don't use IDE. I don't think most developers here use IDE. Emacs and
vim are popular choices. Use grep and find to locate the code snippet /
files you need.

Wei.

Re: Interested in taking up a project

[Abhinav Gupta]

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Hii,
   I'm still waiting for the confirmation. Have started looking into the
code though.

On Fri, Jun 19, 2015, 2:41 PM Wei Liu <wei.liu2@citrix.com> wrote:

> You should CC the respective technical contact George Dunlap. I've done
> this for you now.
>
> On Fri, Jun 19, 2015 at 07:02:55AM +0000, Abhinav Gupta wrote:
> > Hi,
> >
> >   I am interested in doing the following project for Xen, Introducing
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > PowerClamp-like
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > driver for
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > Xen
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> >  (http://
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > wiki.xenproject.org
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > /wiki/
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > Xen
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > _Development_
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > Projects#Introducing
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > _
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > PowerClamp-like
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > _driver_for_
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >
> > Xen
> > <
> http://wiki.xenproject.org/wiki/Xen_Development_Projects#Introducing_PowerClamp-like_driver_for_Xen
> >),
> > if it is still open.
> >
> > About me: I'm pursuing my undergraduate studies in Mathematics and
> > Computing, from IIT BHU. I'm from India.
> >
> >
> > Please let me know if it is possible for me to take this project.
> >
> > Thanks,
> >
> > Abhinav
>
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xen.org
> > http://lists.xen.org/xen-devel
>
>

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Re: Interested in taking up a project

[Dario Faggioli]

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On Sun, 2015-06-21 at 06:37 +0000, Abhinav Gupta wrote:
> Hii,
>    I'm still waiting for the confirmation. Have started looking into
> the code though.
>
There's not much to confirm. The page with the list of development
project may require a bit of refreshing, but, as far as I know, that
item is not being worked on by anyone, and it is still something that
could be interesting (it's possible that George has different
information/opinion, but I don't think so).

As this is in Linux since a while, I think it may be worth having a look
at how it's used there these days, what's the interface, if there have
been tools built upon the driver, etc.

It won't be possible to share kernel code (it'll be hypervisor for us),
but, as stated in the description, it would be good to check whether we
can share and/or be compatible at higher layers.

Just some random links:
https://www.kernel.org/doc/Documentation/thermal/intel_powerclamp.txt
https://01.org/linux-thermal-daemon/documentation/introduction-thermal-daemon
https://wiki.ubuntu.com/Kernel/PowerManagement/ThermalIssues
https://wiki.archlinux.org/index.php/CPU_frequency_scaling

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
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Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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Re: Interested in taking up a project

[George Dunlap]

On 06/21/2015 07:37 AM, Abhinav Gupta wrote:
> Hii,
>    I'm still waiting for the confirmation. Have started looking into the
> code though.

Hey Abhinav,

Thanks for your interest!  As others have said, it's a free world, so of
course you can work on and attempt to contribute whatever you want. :-)

There's nobody else working on this yet, and it's probably still a good
idea, so in that sense, the project is something that you should feel
free to start working on.

I don't have time at the moment to commit to the level of mentorship I
would if you were a GSoC intern; but as a community, we're generally
pretty good about helping people who try to get involved -- as you've
already found out. :-)

One heads-up: A thing we've started doing in our community, before
submitting a large new feature, is to post a design document describing
the purpose of the new feature, and a technical overview of the changes
that you want to make and why.

This is *not required*; you are free to just submit patches with your
changes, and many people do.  However, it's not uncommon for maintainers
to request significant changes to the architecture or approach on major
features, which require a major re-write.  This can be frustrating both
for you and for us.  Done properly, a design document can make things
easier for all of us.

Looking forward to seeing your work!

 -George

Re: Interested in taking up a project

[Abhinav Gupta]

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Thanks for the help and support guys. I'll need some time to get a proper
understanding of how it is incorporated in Linux kernel and what all
interfaces are built on top of it. Once I'm comfortable with that and xen's
credit_scheduler, for starting, I'll come up with a design doc and share
with you all. I'll keep reporting the progress of the work and ask related
doubts in this thread.

Thanks,
Abhinav

On Mon, Jun 22, 2015, 3:15 PM George Dunlap <george.dunlap@eu.citrix.com>
wrote:

> On 06/21/2015 07:37 AM, Abhinav Gupta wrote:
> > Hii,
> >    I'm still waiting for the confirmation. Have started looking into the
> > code though.
>
> Hey Abhinav,
>
> Thanks for your interest!  As others have said, it's a free world, so of
> course you can work on and attempt to contribute whatever you want. :-)
>
> There's nobody else working on this yet, and it's probably still a good
> idea, so in that sense, the project is something that you should feel
> free to start working on.
>
> I don't have time at the moment to commit to the level of mentorship I
> would if you were a GSoC intern; but as a community, we're generally
> pretty good about helping people who try to get involved -- as you've
> already found out. :-)
>
> One heads-up: A thing we've started doing in our community, before
> submitting a large new feature, is to post a design document describing
> the purpose of the new feature, and a technical overview of the changes
> that you want to make and why.
>
> This is *not required*; you are free to just submit patches with your
> changes, and many people do.  However, it's not uncommon for maintainers
> to request significant changes to the architecture or approach on major
> features, which require a major re-write.  This can be frustrating both
> for you and for us.  Done properly, a design document can make things
> easier for all of us.
>
> Looking forward to seeing your work!
>
>  -George
>
>

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Re: Interested in taking up a project

[Dario Faggioli]

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On Wed, 2015-06-24 at 09:56 +0000, Abhinav Gupta wrote:
> Thanks for the help and support guys. I'll need some time to get a
> proper understanding of how it is incorporated in Linux kernel and
> what all interfaces are built on top of it. 
>
Sure! Of course, that was just a suggestion, and we are mostly
interested in having this in Xen, not about how the Linux implementation
works.

Actually, I do believe that, if the thing is popular on Linux, and if
there are user-level (or whatever-level) tools that interact with it, a
common (or at least a compatible and easy to adapt) interface would be a
great plus (for us!), but really, don't go too much deep with that.

What I really meant was that, if it were me doing this, I'd at least
have a look, with the aim of figuring out how actually popular, useful
and used this is in the Linux world. If it's used a lot, then we can see
about being compatible with it. If it's just some forgotten piece of
code inside the kernel, then we can implement our own variant of it,
without caring of Linux's interface and user space tools!

> Once I'm comfortable with that and xen's credit_scheduler, for
> starting, I'll come up with a design doc and share with you all. 
>
Sure, that would be great.

> I'll keep reporting the progress of the work and ask related doubts in
> this thread.
>
Or, feel free to use this thread for updates, but open new ones for
specific questions or issues.

As soon as you read, understand and follow:
http://wiki.xenproject.org/wiki/Asking_Developer_Questions

Go ahead and ask whatever you need help and advise with! :-)

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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Re: Interested in taking up a project

[Abhinav Gupta]

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Hi everyone,
  I'm sorry for the late update. Actually I had another  project going on
in parallel, didn't want to distribute efforts. I'm all free now. I'hv gone
through  ACPI and  how linux facilitates services on top of it to allow
easy development of drivers.
I went through the implementation approach of powerclamp, it controls power
consumption by managing C states of the core. This was my learning so far.
Code makes a  little sense to me, I'll need some more time to get hands on
powerclamp's code ( I'hv no experience with linux kernel code). After this
I'll start exploring Xen.

@Dario I'll look into how popular it is in the linux world and if there are
some real popular real space applications built on top of it.  I'll put my
findings here.

Please let me know if I'm in the right direction


On Wed, Jul 1, 2015 at 6:41 PM, Dario Faggioli <dario.faggioli@citrix.com>
wrote:

> On Wed, 2015-06-24 at 09:56 +0000, Abhinav Gupta wrote:
> > Thanks for the help and support guys. I'll need some time to get a
> > proper understanding of how it is incorporated in Linux kernel and
> > what all interfaces are built on top of it.
> >
> Sure! Of course, that was just a suggestion, and we are mostly
> interested in having this in Xen, not about how the Linux implementation
> works.
>
> Actually, I do believe that, if the thing is popular on Linux, and if
> there are user-level (or whatever-level) tools that interact with it, a
> common (or at least a compatible and easy to adapt) interface would be a
> great plus (for us!), but really, don't go too much deep with that.
>
> What I really meant was that, if it were me doing this, I'd at least
> have a look, with the aim of figuring out how actually popular, useful
> and used this is in the Linux world. If it's used a lot, then we can see
> about being compatible with it. If it's just some forgotten piece of
> code inside the kernel, then we can implement our own variant of it,
> without caring of Linux's interface and user space tools!
>
> > Once I'm comfortable with that and xen's credit_scheduler, for
> > starting, I'll come up with a design doc and share with you all.
> >
> Sure, that would be great.
>
> > I'll keep reporting the progress of the work and ask related doubts in
> > this thread.
> >
> Or, feel free to use this thread for updates, but open new ones for
> specific questions or issues.
>
> As soon as you read, understand and follow:
> http://wiki.xenproject.org/wiki/Asking_Developer_Questions
>
> Go ahead and ask whatever you need help and advise with! :-)
>
> Regards,
> Dario
> --
> <<This happens because I choose it to happen!>> (Raistlin Majere)
> -----------------------------------------------------------------
> Dario Faggioli, Ph.D, http://about.me/dario.faggioli
> Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
>

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Re: Interested in taking up a project

[Dario Faggioli]

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On Sat, 2015-07-11 at 02:03 +0530, Abhinav Gupta wrote:
> Hi everyone,
>
Hey, :-)

>   I'm sorry for the late update. Actually I had another  project going
> on in parallel, didn't want to distribute efforts.
>
Sure, no problem.

> I went through the implementation approach of powerclamp, it controls
> power consumption by managing C states of the core. This was my
> learning so far. Code makes a  little sense to me, I'll need some more
> time to get hands on powerclamp's code ( I'hv no experience with linux
> kernel code). After this I'll start exploring Xen. 
>
Right. Bear in mind that, with respect to this, Linux and Xen are quite
different. Or at least, that's certainly true for scheduling... for
ACPI, there might be similarities due to the fact that ACPI support in
Xen is inspired to Linux one, but I'm no expert in that, so I don't
really know.

The point I wanted to make was, although some understanding on how
things work in Linux, in order to figure out what PowerClamp really
does, is necessary, start focusing on Xen ASAP, as that is your
target! :-)

> @Dario I'll look into how popular it is in the linux world and if
> there are some real popular real space applications built on top of
> it.  I'll put my findings here.
>
Ok, that would be great.

Thanks and Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
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Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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Re: Interested in taking up a project

[Abhinav Gupta]

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Hii everyone :) ,
   I'm quite familiar with the linux powerclamp driver now.
I have also started looking into xen's code as Dario suggested, but am not
able to find proper documentation for xen.
These are my doubts:
1. Looking for a brief explanation of different fields in scheduler data
structure in sched-if.h
2. From where do the different fields of scheduler structure gets called.
3. The driver i'll be writing will it be running at host machine level or
guest OS level ?. As far as my understanding goes we should have it at host
level to optimize the performance of all the guests, since VMs deal with
the abstract interface (VCPU) so they wont be having the exact notion of
the various parameters of cpu at runtime.

Please let me know if I'm wrong anywhere.

Thanks,
Abhinav

On Mon, Jul 13, 2015 at 3:15 PM, Dario Faggioli <dario.faggioli@citrix.com>
wrote:

> On Sat, 2015-07-11 at 02:03 +0530, Abhinav Gupta wrote:
> > Hi everyone,
> >
> Hey, :-)
>
> >   I'm sorry for the late update. Actually I had another  project going
> > on in parallel, didn't want to distribute efforts.
> >
> Sure, no problem.
>
> > I went through the implementation approach of powerclamp, it controls
> > power consumption by managing C states of the core. This was my
> > learning so far. Code makes a  little sense to me, I'll need some more
> > time to get hands on powerclamp's code ( I'hv no experience with linux
> > kernel code). After this I'll start exploring Xen.
> >
> Right. Bear in mind that, with respect to this, Linux and Xen are quite
> different. Or at least, that's certainly true for scheduling... for
> ACPI, there might be similarities due to the fact that ACPI support in
> Xen is inspired to Linux one, but I'm no expert in that, so I don't
> really know.
>
> The point I wanted to make was, although some understanding on how
> things work in Linux, in order to figure out what PowerClamp really
> does, is necessary, start focusing on Xen ASAP, as that is your
> target! :-)
>
> > @Dario I'll look into how popular it is in the linux world and if
> > there are some real popular real space applications built on top of
> > it.  I'll put my findings here.
> >
> Ok, that would be great.
>
> Thanks and Regards,
> Dario
>
> --
> <<This happens because I choose it to happen!>> (Raistlin Majere)
> -----------------------------------------------------------------
> Dario Faggioli, Ph.D, http://about.me/dario.faggioli
> Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
>

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Re: Interested in taking up a project

[Dario Faggioli]

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On Sat, 2015-07-25 at 18:04 +0530, Abhinav Gupta wrote:
> Hii everyone :) , 
>
Hi,

>    I'm quite familiar with the linux powerclamp driver now. 
>
Nice to hear. Is there anything about that you think it would be
useful/interesting about to share here? 
> 
> I have also started looking into xen's code as Dario suggested, but am
> not able to find proper documentation for xen.
>
He, I think I see what you mean... Consider that, when you reach a
certain point, e.g., wanting to understand the code of a complex project
like Xen, the best documentation for the source code is the source code
itself.

> 1. Looking for a brief explanation of different fields in scheduler
> data structure in sched-if.h
>
> 2. From where do the different fields of scheduler structure gets
> called.
>
As said above, something like that does not exist for any reasonably big
and reasonably complex piece of software. There are many reasons. One,
for instance, is that it would take a great effort to be put together,
and it will get out of date in a matter of a few months, at most (but
even a few weeks, or a few days, if you're unlucky).

All that being said, you can have a look here:
 http://wiki.xen.org/wiki/Credit2_Scheduler_Development

It's not exactly what you're asking, but it's probably the closest
existing thing.

Also, as a proof that I was speaking the truth just above:
 1. it's incomplete
 2. it's (slightly) out of dated already

 :-(

> 3. The driver i'll be writing will it be running at host machine level
> or guest OS level ?. 
>
Definitely host.

Actually, at the guest level, it's already there... it's powerclamp
itself, isn't it (at lease in case of Linux) ? :-D

> As far as my understanding goes we should have it at host level to
> optimize the performance of all the guests, 
>
Yes, exactly. Also, it's only the host that have a big enough picture,
and the access to all the information and the data you need.

> since VMs deal with the abstract interface (VCPU) so they wont be
> having the exact notion of the various parameters of cpu at runtime.
>
Indeed. They won't have the exact notion of a bunch of stuff. :-)

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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