STINNER Victor added the comment:

The motivation to support PYTHONMALLOC=malloc (always use malloc) and not just 
PYTHONMALLOC=debug (enable debug hooks) is to allow to use external memory 
debugger like Valgrind.

Valgrind doesn't like pymalloc (pymalloc raises false alarms), we had to a 
configuration option for it: ./configure --with-valgrind.

Using PYTHONMALLOC=malloc allows to use Valgrind on the system Python, it's 
easier to use. No need to recompile Python.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26516>
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