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

[Chandra Seetharaman]

On Fri, 2006-08-18 at 09:42 -0700, Andrew Morton wrote:
> On Fri, 18 Aug 2006 07:45:48 -0700
> Dave Hansen <haveblue at us.ibm.com> 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.
> > 
> 
> I have this mad idea that you can divide a 128GB machine up into 256 fake
> NUMA nodes, then you use each "node" as a 512MB unit of memory allocation. 
> So that 4.5GB job would be placed within an exclusive cpuset which has nine
> "mems" (what are these called?) and voila: the job has a hard 4.5GB limit,
> no kernel changes needed.

In this model memory and container are tightly coupled, hence memory
might be unused/wasted in one container/resource group", while a
different group is hitting its limit too often.

In order to minimize this effect, resource controllers should be
providing both minimum and maximum amount of resources available for a
resource group.

> 
> Unfortunately this is not testable because numa=fake=256 doesn't come even
> vaguely close to working.  Am trying to get that fixed.
> 
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    Chandra Seetharaman               | Be careful what you choose....
              - sekharan at us.ibm.com   |      .......you may get it.
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