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alistair23-linux/arch/powerpc/mm
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Anton Blanchard 91b0f5ec53 powerpc/mm: Move 64-bit unmapped_area to top of address space 
We currently place mmaps just below the stack on 32bit, but leave them
in the middle of the address space on 64bit:

00100000-00120000 r-xp 00100000 00:00 0                    [vdso]
10000000-10010000 r-xp 00000000 08:06 179534               /tmp/sleep
10010000-10020000 rw-p 00000000 08:06 179534               /tmp/sleep
10020000-10130000 rw-p 10020000 00:00 0                    [heap]
40000000000-40000030000 r-xp 00000000 08:06 440743         /lib64/ld-2.9.so
40000030000-40000040000 rw-p 00020000 08:06 440743         /lib64/ld-2.9.so
40000050000-400001f0000 r-xp 00000000 08:06 440671         /lib64/libc-2.9.so
400001f0000-40000200000 r--p 00190000 08:06 440671         /lib64/libc-2.9.so
40000200000-40000220000 rw-p 001a0000 08:06 440671         /lib64/libc-2.9.so
40000220000-40008230000 rw-p 40000220000 00:00 0
fffffbc0000-fffffd10000 rw-p fffffeb0000 00:00 0           [stack]

Right now it isn't an issue, but at some stage we will run into mmap or
hugetlb allocation issues. Using the same layout as 32bit gives us a
some breathing room. This matches what x86-64 is doing too.

00100000-00103000 r-xp 00100000 00:00 0                    [vdso]
10000000-10001000 r-xp 00000000 08:06 554894               /tmp/test
10010000-10011000 r--p 00000000 08:06 554894               /tmp/test
10011000-10012000 rw-p 00001000 08:06 554894               /tmp/test
10012000-10113000 rw-p 10012000 00:00 0                    [heap]
fffefdf7000-ffff7df8000 rw-p fffefdf7000 00:00 0
ffff7df8000-ffff7f97000 r-xp 00000000 08:06 130591         /lib64/libc-2.9.so
ffff7f97000-ffff7fa6000 ---p 0019f000 08:06 130591         /lib64/libc-2.9.so
ffff7fa6000-ffff7faa000 r--p 0019e000 08:06 130591         /lib64/libc-2.9.so
ffff7faa000-ffff7fc0000 rw-p 001a2000 08:06 130591         /lib64/libc-2.9.so
ffff7fc0000-ffff7fc4000 rw-p ffff7fc0000 00:00 0
ffff7fc4000-ffff7fec000 r-xp 00000000 08:06 130663         /lib64/ld-2.9.so
ffff7fee000-ffff7ff0000 rw-p ffff7fee000 00:00 0
ffff7ffa000-ffff7ffb000 rw-p ffff7ffa000 00:00 0
ffff7ffb000-ffff7ffc000 r--p 00027000 08:06 130663         /lib64/ld-2.9.so
ffff7ffc000-ffff7fff000 rw-p 00028000 08:06 130663         /lib64/ld-2.9.so
ffff7fff000-ffff8000000 rw-p ffff7fff000 00:00 0
fffffc59000-fffffc6e000 rw-p ffffffeb000 00:00 0           [stack]

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-02-11 16:00:07 +11:00
..
40x_mmu.c powerpc/40x: Limit allocable DRAM during early mapping 2008-11-13 10:10:56 -05:00
44x_mmu.c powerpc: rework 4xx PTE access and TLB miss 2008-07-09 13:36:17 -04:00
fault.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
fsl_booke_mmu.c Merge commit 'kumar/next' into next 2009-02-11 13:37:44 +11:00
gup.c powerpc: Get USE_STRICT_MM_TYPECHECKS working again 2008-10-14 10:35:27 +11:00
hash_low_32.S powerpc: Fix missing 'blr' in _tlbia() 2008-12-21 02:54:25 -07:00
hash_low_64.S powerpc: Free a PTE bit on ppc64 with 64K pages 2008-06-30 22:30:53 +10:00
hash_native_64.c [POWERPC] Use 1TB segments 2007-10-12 14:05:17 +10:00
hash_utils_64.c powerpc: Don't use a 16G page if beyond mem= limits 2008-10-22 15:01:21 +11:00
hugetlbpage.c mm: report the MMU pagesize in /proc/pid/smaps 2009-01-06 15:58:58 -08:00
init_32.c powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M 2008-12-23 15:13:29 +11:00
init_64.c powerpc: Get USE_STRICT_MM_TYPECHECKS working again 2008-10-14 10:35:27 +11:00
Makefile powerpc/mm: Split low level tlb invalidate for nohash processors 2008-12-21 14:21:16 +11:00
mem.c mm: show node to memory section relationship with symlinks in sysfs 2009-01-06 15:59:00 -08:00
mmap.c powerpc/mm: Move 64-bit unmapped_area to top of address space 2009-02-11 16:00:07 +11:00
mmu_context_hash32.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
mmu_context_hash64.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
mmu_context_nohash.c powerpc/mm: Runtime allocation of mmu context maps for nohash CPUs 2008-12-21 14:21:16 +11:00
mmu_decl.h Merge commit 'kumar/kumar-next' into next 2009-01-13 13:59:03 +11:00
numa.c powerpc/numa: Remove redundant find_cpu_node() 2009-02-11 13:37:59 +11:00
pgtable.c powerpc: Use RCU based pte freeing mechanism for all powerpc 2008-12-03 20:46:35 +11:00
pgtable_32.c powerpc/fsl-booke: Fix mapping functions to use phys_addr_t 2009-02-09 21:11:55 -06:00
pgtable_64.c powerpc ioremap_prot 2008-07-24 10:47:15 -07:00
ppc_mmu_32.c powerpc/mm: Fix handling of _PAGE_COHERENT in BAT setup code 2009-01-28 17:15:52 +11:00
slb.c [POWERPC] vmemmap fixes to use smaller pages 2008-05-15 20:49:25 +10:00
slb_low.S [POWERPC] vmemmap fixes to use smaller pages 2008-05-15 20:49:25 +10:00
slice.c powerpc: is_hugepage_only_range() must account for both 4kB and 64kB slices 2009-01-16 16:15:16 +11:00
stab.c powerpc: Change u64/s64 to a long long integer type 2009-01-13 14:47:59 +11:00
subpage-prot.c [POWERPC] Provide a way to protect 4k subpages when using 64k pages 2008-01-24 10:06:01 +11:00
tlb_hash32.c powerpc/mm: Add SMP support to no-hash TLB handling 2008-12-21 14:21:16 +11:00
tlb_hash64.c powerpc/mm: Rename tlb_32.c and tlb_64.c to tlb_hash32.c and tlb_hash64.c 2008-12-16 15:53:30 +11:00
tlb_nohash.c powerpc: Remove the redundant _tlbil_pid at SMP case 2009-01-08 16:25:13 +11:00
tlb_nohash_low.S powerpc/44x: No need to mask MSR:CE, ME or DE in _tlbil_va on 440 2008-12-21 14:21:16 +11:00