Re: [patch] mm: rewrite vmap layer

[Christoph Lameter <cl@linux-foundation.org>]

Nick Piggin wrote:
> On Wed, Aug 20, 2008 at 11:50:09AM -0500, Christoph Lameter wrote:
>> Nick Piggin wrote:
>>
>>> Indeed that would be a good use for it if this general fallback mechanism
>>> were to be merged.
>> Want me to rebase my virtualizable compound patchset on top of your vmap changes?
> 
> Is there much clash between them? Or just the fact that you'll have to
> use vm_map_ram/vm_unmap_ram?

There is not much of a clash. If you would make vmap/unmap atomic then there
is barely any overlap at all and the patchset becomes much smaller and even
the initial version of it can support in interrupt alloc / free.

> I probably wouldn't be able to find time to look at that patchset again
> for a while... but anyway, I've been running the vmap rewrite for quite
> a while on several different systems and workloads without problems, so
> it should be stable enough to test out. And the APIs should not change.

Yes I think this is good stuff. Hopefully I will get enough time to check it
out in detail.

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