[PATCH v2] Allow shrinking of arena heaps using mmap based on overcommit settings when available

[Siddhesh Poyarekar]

Hi,

Here's an updated patch with changes according to Roland's review
comments.  This works fine on my x86_64 Fedora 16 laptop and does not
cause regressions in the testsuite.

Regards,
Siddhesh

ChangeLog:

	* malloc/arena.c: Include malloc-sysdep.h.
	(shrink_heap): Use check_may_shrink_heap to decide if madvise
	is sufficient to shrink the heap or an unmap is needed.
	* sysdeps/generic/malloc-sysdep.h: New file.  Define
	new function check_may_shrink_heap.
	* sysdeps/unix/sysv/linux/malloc-sysdep.h: New file.  Define
	new function check_may_shrink_heap.
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