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| author | David S. Miller <davem@sunset.davemloft.net> | 2006-03-17 14:41:03 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:16:35 -0800 |
| commit | a91690ddd05ab0b7fbdd37733875525ac75c20f2 (patch) | |
| tree | f6937c0ce29c79078d6df8346a374a7b9947f360 /include/asm-sparc64/pgtable.h | |
| parent | b5e7ae5dd034c2c0ed75c31fca04a805097817bc (diff) | |
| download | op-kernel-dev-a91690ddd05ab0b7fbdd37733875525ac75c20f2.zip op-kernel-dev-a91690ddd05ab0b7fbdd37733875525ac75c20f2.tar.gz | |
[SPARC64]: Top-down address space allocation for 32-bit tasks.
Currently allocations are very constrained for 32-bit processes.
It grows down-up from 0x70000000 to 0xf0000000 which gives about
2GB of stack + dynamic mmap() space.
So support the top-down method, and we need to override the
generic helper function in order to deal with D-cache coloring.
With these changes I was able to squeeze out a mmap() just over
3.6GB in size in a 32-bit process.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/pgtable.h')
| -rw-r--r-- | include/asm-sparc64/pgtable.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h index d427ce6..ed4124e 100644 --- a/include/asm-sparc64/pgtable.h +++ b/include/asm-sparc64/pgtable.h @@ -752,8 +752,11 @@ extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, #include <asm-generic/pgtable.h> -/* We provide our own get_unmapped_area to cope with VA holes for userland */ +/* We provide our own get_unmapped_area to cope with VA holes and + * SHM area cache aliasing for userland. + */ #define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN /* We provide a special get_unmapped_area for framebuffer mmaps to try and use * the largest alignment possible such that larget PTEs can be used. |
