Re: Taking on a Xen development project

[Yang Hongyang <hongyang.yang@easystack.cn>]

On 2015年12月11日 01:23, Andrew Cooper wrote:
> On 04/12/15 20:26, jtotto@uwaterloo.ca wrote:
>> Hi,
>>
>> We're a team of three fourth-year undergraduate software engineering
>> students at the University of Waterloo in Canada.  We're in the process
>> of planning for our capstone design project, and are interested in
>> contributing to Xen.  Ideally, we'd like to take on a hypervisor/kernel
>> hacking project with roughly the same scope as a Google Summer of Code
>> project (like the hypervisor or domain support projects described at
>> [0]), following a similar timeline (roughly May to August 2016).  We're
>> all broadly interested in systems programming in C, and have each had
>> relevant academic and internship experiences.
>>
>> Each of projects [1-3] currently on the Wiki look interesting, though
>> we'd be completely open to others as well.  In particular, we'd be open
>> to picking up Ben Catterall's work on HVM x86 deprivileged mode [4].  Do
>> any of these projects seem like a good fit in terms of usefulness to the
>> community and our timeline?  If so, we'd love to communicate more with
>> any maintainers with projects in mind!  We were also hoping to
>> familiarize ourselves with the project by addressing some Coverity
>> issues, if any are open at the moment.
>>
>> Thanks!
>>
>> Harley Armstrong, Chester Lin, Joshua Otto
>
> Hello - thankyou for your interest.
>
> One area to look at might be the parameters to the live migration
> looping.  As part of the migration v2 rework I did in the 4.6 dev
> period, I left all of that alone, and it is in a working but poor state.
>
> In the past, there have been several research investigations into
> improving the live migration algorithm, such as tracking the rate of
> dirtying of memory, or attempting to resume the domain on the far side
> and fault the final memory across.

I think you mean postcopy here? The hypervisor then needs to maintain
a dirty page bitmap and generate pagefault when a page is not yet
tranferred to the far end.
This feature already merged into QEMU2.5(kvm patch which generates
pagefault also been merged into linux kernel mainline), if you want a
reference, you can take a look at those patches.
This surely is a great aera to work on.

>
> If you are interested in perusing this, start with reading
> docs/features/migration.pandoc in the Xen tree.
>
> ~Andrew
>
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>

-- 
Thanks,
Yang

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