Re: [GIT PULL] mm: frontswap (for 3.2 window)

Cyclonus J
2011-10-28T07:30:13Z

On Fri, Oct 28, 2011 at 12:12 AM, Sasha Levin <levinsasha928@gmail.com> wrote:
> On Thu, 2011-10-27 at 17:52 -0400, Christoph Hellwig wrote:
>> On Thu, Oct 27, 2011 at 02:49:31PM -0700, Dan Magenheimer wrote:
>> > If Linux truly subscribes to the "code rules" mantra, no core
>> > VM developer has proposed anything -- even a design, let alone
>> > working code -- that comes close to providing the functionality
>> > and flexibility that frontswap (and cleancache) provides, and
>> > frontswap provides it with a very VERY small impact on existing
>> > kernel code AND has been posted and working for 2+ years.
>> > (And during that 2+ years, excellent feedback has improved the
>> > "kernel-ness" of the code, but NONE of the core frontswap
>> > design/hooks have changed... because frontswap _just works_!)
>>
>> It might work for whatever defintion of work, but you certainly couldn't
>> convince anyone that matters that it's actually sexy and we'd actually
>> need it.  Only actually working on Xen of course doesn't help.
>
> Theres a working POC of it on KVM, mostly based on reusing in-kernel Xen
> code.
>
> I felt it would be difficult to try and merge any tmem KVM patches until
> both frontswap and cleancache are in the kernel, thats why the
> development is currently paused at the POC level.

Same here. I am working a KVM support for Transcedent Memory as well.
It would be nice to see this in the mainline.

Thanks,
CJ

>
> --
>
> Sasha.
>
>