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authorDavid S. Miller <davem@sunset.davemloft.net>2006-03-17 14:41:03 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 01:16:35 -0800
commita91690ddd05ab0b7fbdd37733875525ac75c20f2 (patch)
treef6937c0ce29c79078d6df8346a374a7b9947f360 /include
parentb5e7ae5dd034c2c0ed75c31fca04a805097817bc (diff)
[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')
-rw-r--r--include/asm-sparc64/pgtable.h5
-rw-r--r--include/asm-sparc64/processor.h2
2 files changed, 6 insertions, 1 deletions
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h
index d427ce649214..ed4124edf837 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.
diff --git a/include/asm-sparc64/processor.h b/include/asm-sparc64/processor.h
index 685479fb4364..c6896b88283e 100644
--- a/include/asm-sparc64/processor.h
+++ b/include/asm-sparc64/processor.h
@@ -217,6 +217,8 @@ static inline void prefetchw(const void *x)
#define spin_lock_prefetch(x) prefetchw(x)
+#define HAVE_ARCH_PICK_MMAP_LAYOUT
+
#endif /* !(__ASSEMBLY__) */
#endif /* !(__ASM_SPARC64_PROCESSOR_H) */