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

[STINNER Victor]

STINNER Victor added the comment:

Oh, Jim Jewett found a bug: if set_traceback_limit() is called while tracemalloc is tracing, two tracebacks are seen different because their length is different, whereas the full traceback would be the same.

To avoid this issue, I propose to add an optional nframe parameter to the set_traceback_limit() function.

With this API, it may be possible to remove the arbitrary limitation of 100 frames by allocating a buffer in start().

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Added file: http://bugs.python.org/file32789/start_nframe.patch

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