[Bug 861296] Re: mmap fails to allocate 2030Mb heap on ARM

[Ulrich Weigand]

Note that all this is decided by the kernel's mmap area allocation
strategy; see the various "get_unmapped_area" routines in platform-
specific kernel code (e.g arch/arm/mm/mmap.c:arch_get_unmapped_area vs.
x86/kernel/sys_x86_64.c:arch_get_unmapped_area_topdown).

If any change is required here (and this behaviour *was* in fact changed
on x86; they used to behave the same way arm still does), it needs to be
done on the kernel side.

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https://bugs.launchpad.net/bugs/861296

Title:
  mmap fails to allocate 2030Mb heap on ARM

Status in Linaro Toolchain Miscellanies:
  New
Status in “eglibc” package in Ubuntu:
  New

Bug description:
  The attached testcase pass on ia32 but fails on armel systems running oneiric.
  test system got 512mb of ram and 3Gb of swap.

  gcc mmap-test.c -o mmap-test
  ./mmap-test

  on my pandaboard I hit Couldn't allocate the heap: 2025Mb
  on my ac100 I hit Couldn't allocate the heap: 2027Mb

  The testcase fails to allocate heap on armel in the range of
  2023-2030Mb and above.

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