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

[STINNER Victor]

STINNER Victor added the comment:

Charles-François doesn't like packed structure (frame_t) because he fears crash on architectures not supporting non-aligned memory access or bad performances. Antoine and me want them to reduce the memory footprint of the tracemalloc module (tracemalloc.get_tracemalloc_memory()).

I think that the memory footprint has an higher price than the performances for tracemalloc: I can wait longer for a result, whereas I may not be able to use tracemalloc if it uses too much memory.

I propose to pack frame_t structure, and only disable it explicitly on architectures where tracemalloc does crash. What do you think?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18874>
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