Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview

[Avi Kivity]

On 04/23/2010 07:26 PM, Dan Magenheimer wrote:
> > Looks like "init" == open, "put_page" == write, "get_page" == read,
> > "flush_page|flush_area" == trim.  The only difference seems to be that
> > an overwriting put_page may fail.  Doesn't seem to be much of a win,
> >      
> No, ANY put_page can fail, and this is a critical part of the API
> that provides all of the flexibility for the hypervisor and all
> the guests. (See previous reply.)
>    

The guest isn't required to do any put_page()s.  It can issue lots of 
them when memory is available, and keep them in the hypervisor forever.  
Failing new put_page()s isn't enough for a dynamic system, you need to 
be able to force the guest to give up some of its tmem.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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