[issue26516] Add PYTHONMALLOC env var and add support for malloc debug hooks in release mode

[STINNER Victor]

STINNER Victor added the comment:

The output of sys._debugmallocstats() contains different info:

* Stats of type free lists
* pymalloc stats
* number of calls to memory allocators

The available info depends on:

* pymalloc disabled at compilation with ./configure --without-pymalloc
* pymalloc disabled at runtime with PYTHONMALLOC=malloc or PYTHONMALLOC=malloc_debug
* debug hooks adds the "times object malloc called" counter: by default if Python is compiled with ./configure --with-pydebug, or enabled at runtime using PYTHONMALLOC=pymalloc_debug or PYTHONMALLOC=malloc_debug

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26516>
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