[issue18874] Add a new tracemalloc module to trace memory allocations

[STINNER Victor]

STINNER Victor added the comment:

TODO list:

* remove dependency to psutil
* enable PYMEM_RAW: fix subinterpreter issue, check which variables are protected by which lock
* test the command line interface?
* don't trace objects created by get_stats(), reentrant flag should be a thread-local variable
* add an hash table of tracebacks: 86% of tracebacks are duplicated

See also the TODO.txt file in the tracemalloc repository.

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<http://bugs.python.org/issue18874>
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