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

[Siddhesh Poyarekar]

On Wed, 22 Aug 2012 00:06:10 +0530, Siddhesh wrote:
> ChangeLog:
> 
> 	* malloc/arena.c: Include malloc-sysdep.h.
> 	(shrink_heap): New static variable may_shrink_heap to decide
> if madvise is sufficient to shrink the heap or an unmap is needed.
> 	* sysdeps/generic/Makefile (sysdep_headers): Add
> 	malloc-sysdep.h as a dependency when building malloc.
> 	* sysdeps/generic/malloc-sysdep.h: New file.  Define
> 	new function check_may_shrink_heap.
> 	* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
> 	malloc-sysdep.h as dependency when building malloc.
> 	* sysdeps/unix/sysv/linux/malloc-sysdep.h: New file.  Define
> 	new function check_may_shrink_heap.
> 

I have attached an updated patch after Florian pointed out that I had
leaked a file descriptor. The ChangeLog remains the same.

Regards,
Siddhesh
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