Re: x86 swiotlb questions

[Keir Fraser <keir@xensource.com>]

On 15/12/06 13:53, "Jan Beulich" <jbeulich@novell.com> wrote:

> I already have patches ready to do this (the DMA thing really is a nice side
> effect, I mostly wanted it for 32on64, so that I can restrict domain
> allocations for 32-bit domains). Are you saying I should throw away the
> DMA specialization then altogether (I already have no special DMA heap
> anymore)? The leftovers from it are so that one can reserve some portion
> of low memory to be returned only when the width restriction is low enough
> (i.e. to retain dma_emergency_pool functionality), which certainly isn't
> really appropriate anymore now (it should rather be a percentage or
> something like that, so that the lower you get the more of the memory
> remains reserved for specialized allocations).

I think dma_emergency_pool as is can go. Possibly it should be replaced by
allocator-management tools in dom0 to allow setting of limits on a
per-bitwidth basis.

Is this one of the patches you already sent in your 32-on-64 batch, or an
additional one?

 -- Keir