I put a new version of the 4level page table patchkit at
ftp://ftp.suse.com/pub/people/ak/4level/4level-2.6.9-1.gz
It extends the Linux VM to understand 4level page tables and extends
the virtual address room of each x86-64 process to be 128TB (previously
512GB)
The extension is quite straight forward without any significant
redesign. The new level is called pml4.
The patch needs some simple changes to all architectures.
Changes compared to 4level-2.6.9rc4-2:
- Merged with 2.6.9 (release, not -final)
- Converted more architectures.
Porting status:
- i386 works with 2/3 levels.
- x86-64 works with 4 levels.
- ppc64 works with 3 levels
- ia64 works with 3 levels
- sh converted, but was unable to compile because it's broken in mainline
- ppc32 converted, compiles, not tested.
- alpha converted, boots
- sparc64 converted, compiles, not tested
- arm*/h8300/cris/m32r/m68k*/mips/parisc/s390/sh64/um/v850: still need to be converted
For many of them it's difficult because they don't even compile in mainline.
More testing on x86-64 and other architectures and new architecture ports would be
appreciated.
The changes needed to convert an architecture over are relatively simple,
see the i386 port as an example.
-Andi
On Tue, 19 Oct 2004 04:04:26 +0200, Andi Kleen wrote:
>I put a new version of the 4level page table patchkit at
>
>ftp://ftp.suse.com/pub/people/ak/4level/4level-2.6.9-1.gz
>
>It extends the Linux VM to understand 4level page tables and extends
>the virtual address room of each x86-64 process to be 128TB (previously
>512GB)
>
>The extension is quite straight forward without any significant
>redesign. The new level is called pml4.
>
>The patch needs some simple changes to all architectures.
>
>Changes compared to 4level-2.6.9rc4-2:
>- Merged with 2.6.9 (release, not -final)
>- Converted more architectures.
>
>Porting status:
>- i386 works with 2/3 levels.
>- x86-64 works with 4 levels.
>- ppc64 works with 3 levels
>- ia64 works with 3 levels
>- sh converted, but was unable to compile because it's broken in mainline
>- ppc32 converted, compiles, not tested.
Tested on my ppc32 box. Survives booting and doing a kernel
recompile.
/Mikael