tracemalloc: allow resetting peak memory metric without touching other traces

[huonw]

BPO	40630
Nosy	@vstinner, @huonw
PRs	bpo-40630: add tracemalloc.reset_peak #20102 [3.9] bpo-40630: Add tracemalloc.reset_peak (GH-20102) #20545 bpo-40630: adjust tracemalloc.reset_peak docs for backport to 3.9 #20546

^{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 2020-05-22.14:20:06.099>
created_at = <Date 2020-05-15.02:12:35.989>
labels = ['type-feature', 'library', '3.9']
title = 'tracemalloc: allow resetting peak memory metric without touching other traces'
updated_at = <Date 2020-06-01.17:27:29.441>
user = 'https://github.com/huonw'

bugs.python.org fields:

activity = <Date 2020-06-01.17:27:29.441>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-22.14:20:06.099>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2020-05-15.02:12:35.989>
creator = 'huonw'
dependencies = []
files = []
hgrepos = []
issue_num = 40630
keywords = ['patch']
message_count = 6.0
messages = ['368916', '369604', '369605', '370566', '370567', '370568']
nosy_count = 2.0
nosy_names = ['vstinner', 'huonw']
pr_nums = ['20102', '20545', '20546']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40630'
versions = ['Python 3.9']

[huonw]

Per https://mail.python.org/archives/list/python-ideas@python.org/thread/QDWI37A4TJXOYUKULGPY2GKD7IG2JNDC/ , it would be helpful to have a function that resets the peak memory usage of the tracemalloc module, without changing all the traces.

This allows for recording the peak memory usage of a specific region of code, rather than only the peak since the last tracemalloc.start() or tracemalloc.clear_traces() call.

[vstinner]

New changeset 8b62644 by Huon Wilson in branch 'master':
bpo-40630: Add tracemalloc.reset_peak (GH-20102)
8b62644

[vstinner]

Thanks Huon Wilson!

[vstinner]

New changeset 3c7609a by Huon Wilson in branch '3.9':
[3.9] bpo-40630: Add tracemalloc.reset_peak (GH-20102) (GH-20545)
3c7609a

[vstinner]

New changeset 39de8e4 by Huon Wilson in branch 'master':
bpo-40630: adjust tracemalloc.reset_peak docs for backport to 3.9 (GH-20546)
39de8e4

[vstinner]

Feature added to Python 3.9. Lukasz allowed to add the feature to Python 3.9 beta2:
#20102 (comment)