No update of memory usage

[Kexiii]

Description

Memory Usage is not working in my environment

Reproduce

The memory usage is not working and won't update when I run code in cell, and I got this error message in jupyter console, I don't know if it's related:

[IPKernelApp] ERROR | Exception in control handler:
Traceback (most recent call last):
  File "*/Python/3.8/lib/python/site-packages/ipykernel/kernelbase.py", line 334, in process_control
    await result
  File "*/Python/3.8/lib/python/site-packages/ipykernel/kernelbase.py", line 986, in usage_request
    reply_content["kernel_memory"] = sum(
TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'

Context

jupyter-resource-usage    1.0.1

IPython          : 8.4.0
ipykernel        : 6.15.1
ipywidgets       : 7.7.1
jupyter_client   : 8.3.0
jupyter_core     : 5.3.1
jupyter_server   : 2.7.0
jupyterlab       : 4.0.4
nbclient         : 0.6.6
nbconvert        : 6.5.0
nbformat         : 5.4.0
notebook         : 7.0.6
qtconsole        : 5.3.1
traitlets        : 5.9.0

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[z0gSh1u]

Same issue. It seems some process the kernel tallys memory for is already terminated, causing a None entry in summed items.

[holzman]

This should be fixed if you update ipykernel to at least 6.29.1: ipython/ipykernel#1204