Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

Rohit Seth
2006-08-22T01:18:00Z

On Mon, 2006-08-21 at 11:47 +0900, Magnus Damm wrote:
> On Fri, 2006-08-18 at 07:45 -0700, Dave Hansen wrote:
> > On Fri, 2006-08-18 at 12:08 +0400, Andrey Savochkin wrote:
> > >
> > > A) Have separate memory management for each container,
> > > with separate buddy allocator, lru lists, page replacement mechanism.
> > > That implies a considerable overhead, and the main challenge there
> > > is sharing of pages between these separate memory managers.
> >
> > Hold on here for just a sec...
> >
> > It is quite possible to do memory management aimed at one container
> > while that container's memory still participates in the main VM.
> >
> > There is overhead here, as the LRU scanning mechanisms get less
> > efficient, but I'd rather pay a penalty at LRU scanning time than divide
> > up the VM, or coarsely start failing allocations.
>
> This could of course be solved with one LRU per container, which is how
> the CKRM memory controller implemented things about a year ago.

Effectively Andrew's idea of faking up nodes is also giving per
container LRUs.

-rohit