On Tue, 2007-10-23 at 16:55 -0700, H. Peter Anvin wrote:
> Andi Kleen wrote:
> >
> > With the early reserve code in
> > ftp://firstfloor.org/pub/ak/x86_64/quilt/patches/early-reserve
> > and
> > ftp://firstfloor.org/pub/ak/x86_64/quilt/patches/early-alloc
> > this could be likely done cleaner.
> >
>
> Indeed it could. For i386, the equivalent code would have another
> significant benefit: reserving memory and then mapping and accessing it
> later would (at least eventually) allow accesses > 4 GB on PAE kernels
> (or with a PSE36 hack, on non-PAE kernels.)
For i386, the bootmem allocator covers at most 0~796M memory area. So
some early reserve memory area can not be revered with bootmem allocator
later. Should we fix bootmem allocator firstly?
Best Regards,
Huang Ying
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