[issue36139] release GIL on mmap dealloc

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

The change sounds like a good idea and should be backported, too.

IIRC mmap() performance also depends on MMU and TLB speed. In the past I have seen paravirtualized systems with poor MMU performance that caused fork() to be slow and Redis to hang.

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nosy: +christian.heimes, davin
versions: +Python 3.7

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