Expose tracemalloc C API to track/untrack memory blocks

[vstinner]

BPO	30054
Nosy	@vstinner
PRs	bpo-30054: Expose tracemalloc C API #1236

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-06-20.15:47:31.122>
created_at = <Date 2017-04-12.13:42:25.341>
labels = ['type-feature', '3.7']
title = 'Expose tracemalloc C API to track/untrack memory blocks'
updated_at = <Date 2017-06-20.15:47:31.121>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2017-06-20.15:47:31.121>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-06-20.15:47:31.122>
closer = 'vstinner'
components = []
creation = <Date 2017-04-12.13:42:25.341>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 30054
keywords = []
message_count = 7.0
messages = ['291554', '291556', '291557', '291558', '292029', '296463', '296464']
nosy_count = 2.0
nosy_names = ['vstinner', 'jtaylor']
pr_nums = ['1236']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30054'
versions = ['Python 3.7']

[vstinner]

The issue bpo-26530 added a private C API to manually track/untrack memory blocks in tracemalloc. I was just validated by Julian Taylor who confirms that the API works as expected:
http://bugs.python.org/issue26530#msg291551

So I propose to make the 3 newly added functions public and document them:

• _PyTraceMalloc_Track()
• _PyTraceMalloc_Untrack()
• _PyTraceMalloc_GetTraceback()

[jtaylor]

I am not sure if _PyTraceMalloc_GetTraceback really needs to be a public function.
Exposing the tracing information should probably just go over python interfaces.

[vstinner]

What's the status in numpy? Is the current numpy release able to use CPython 3.6 tracemalloc private functions?

[jtaylor]

With this changeset it would:
numpy/numpy#8885

[vstinner]

@jtaylor: Ok, I created #1236

[vstinner]

New changeset 5ea4c06 by Victor Stinner in branch 'master':
bpo-30054: Expose tracemalloc C API (bpo-1236)
5ea4c06

[vstinner]

I merged my PR: the future Python 3.7 will provide a public C API to track memory allocations.