Allow gc.getobjects to return the objects tracked by a specific generation

[pablogsal]

BPO	36016
Nosy	@nascheme, @pitrou, @methane, @pablogsal
PRs	bpo-36016: Allow gc.getobjects to return the objects in a specific generation #11909

^{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 2019-02-23.11:50:17.660>
created_at = <Date 2019-02-17.20:20:35.053>
labels = ['interpreter-core', '3.8']
title = 'Allow gc.getobjects to return the objects tracked by a specific generation'
updated_at = <Date 2019-02-23.11:50:17.660>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2019-02-23.11:50:17.660>
actor = 'methane'
assignee = 'none'
closed = True
closed_date = <Date 2019-02-23.11:50:17.660>
closer = 'methane'
components = ['Interpreter Core']
creation = <Date 2019-02-17.20:20:35.053>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 36016
keywords = ['patch']
message_count = 2.0
messages = ['335787', '336357']
nosy_count = 4.0
nosy_names = ['nascheme', 'pitrou', 'methane', 'pablogsal']
pr_nums = ['11909']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36016'
versions = ['Python 3.8']

[pablogsal]

gc.get_objects() return all the objects tracked by the garbage collector. This is useful, but right now there is no way of knowing in which generation each object is currently on. This information can be beneficial to understand better the state of the garbage collector in a particular moment in time.

This will allow knowing what are the oldest object tracked by the collector, gathering more fine-grained statistics about how generations are filled, better debugging and better insights about the internal structure of the generations.

To allow this, I propose a new optional parameter to gc.get_objects, allowing the user to specify the generation to get the objects from.

[methane]

New changeset 175421b by Inada Naoki (Pablo Galindo) in branch 'master':
bpo-36016: Add generation option to gc.getobjects() (GH-11909)
175421b