[issue26601] Use new madvise()'s MADV_FREE on the private heap

[David Wilson]

David Wilson added the comment:

@Julian note that ARENA_SIZE is double the threshold after which at least glibc resorts to calling mmap directly, so using malloc in place of mmap on at least Linux would have zero effect

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nosy: +dw

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<http://bugs.python.org/issue26601>
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