[uml-devel] Sharing code pages between host and guest

[uml-devel] Sharing code pages between host and guest

[Jun OKAJIMA]

Hello Jeff, Long time no see.

I am studying now for how you share same content page between host and guest.
In other words, if host and guest use just very same binary of glibc,
then, how to share code pages of glibc (or bash or...).
I think one of the biggest problem of virtualization is memory,
and one common technique to solve it is sharing pages, dont you?

My question is, if you share /lib through HostFS,
can I share code pages of /lib/libc.6.so between host and guest?

                  --- Okajima, Jun. Tokyo, Japan.








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Re: [uml-devel] Sharing code pages between host and guest

[Jeff Dike]

On Sun, Mar 12, 2006 at 11:26:09PM +0900, Jun OKAJIMA wrote:
> I am studying now for how you share same content page between host and guest.
> In other words, if host and guest use just very same binary of glibc,
> then, how to share code pages of glibc (or bash or...).
> I think one of the biggest problem of virtualization is memory,
> and one common technique to solve it is sharing pages, dont you?

That would certainly help, although you are giving up one advantage of
virtualization this way, which is the ability to have the guest and host
be running different versions of the kernel and/or userspace.

> My question is, if you share /lib through HostFS,
> can I share code pages of /lib/libc.6.so between host and guest?

If hostfs mmaps pages (which it currently doesn't, but is planned).

				Jeff


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Re: [uml-devel] Sharing code pages between host and guest

[Jun OKAJIMA]

>> I am studying now for how you share same content page between host and guest.
>> In other words, if host and guest use just very same binary of glibc,
>> then, how to share code pages of glibc (or bash or...).
>> I think one of the biggest problem of virtualization is memory,
>> and one common technique to solve it is sharing pages, dont you?
>
>That would certainly help, although you are giving up one advantage of
>virtualization this way, which is the ability to have the guest and host
>be running different versions of the kernel and/or userspace.
>

I dont think so. It can be solved easyily with using UnionFS.


>> My question is, if you share /lib through HostFS,
>> can I share code pages of /lib/libc.6.so between host and guest?
>
>If hostfs mmaps pages (which it currently doesn't, but is planned).
>

Good to hear! I am waiting it in hope.


            --- Okajima, Jun. Tokyo, Japan.




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