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

[Antti Haapala]

Antti Haapala added the comment:

... and it turns out that munmapping is not always that smart thing to do: http://stackoverflow.com/questions/36548518/variable-assignment-faster-than-one-liner

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nosy: +ztane

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