Re: [RFC][PATCH 1/3] contigous big page allocator

[KAMEZAWA Hiroyuki]

On Wed, 13 Oct 2010 09:01:43 +0200
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> writes:
> >
> > What this wants to do: 
> >   allocates a contiguous chunk of pages larger than MAX_ORDER.
> >   for device drivers (camera? etc..)
> 
> I think to really move forward you need a concrete use case
> actually implemented in tree.
> 

yes. I heard there were users at LinuxCon Japan, so restarted.
I heared video-for-linux + ARM wants this.

I found this thread, now.
http://kerneltrap.org/mailarchive/linux-kernel/2010/10/10/4630166

Hmm. 

> >   My intention is not for allocating HUGEPAGE(> MAX_ORDER).
> 
> I still believe using this for 1GB pages would be one of the more
> interesting use cases.
> 

I'm successfully allocating 1GB of continous pages at test. But I'm not sure
requirements and users. How quick this allocation should be ?
For example, if prep_new_page() for 1GB page is slow, what kind of chunk-of-page
construction is the best. 

THanks,
-Kame

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