Martin Sivák has posted comments on this change.

Change subject: Cache the result of numaUtils.getVcpuPids
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Patch Set 7:

(1 comment)

No tests except what we already had (and that uses the cache). I would have to 
mock the filesystem ops to really test everything here.

https://gerrit.ovirt.org/#/c/38564/7/vdsm/numaUtils.py
File vdsm/numaUtils.py:

Line 53:     try:
Line 54:         if path in _libvirt_vcpu_pids_cache:
Line 55:             lastmtime, value = _libvirt_vcpu_pids_cache[path]
Line 56:             if lastmtime == mtime:
Line 57:                 return value
> quite minor:
I did not want to handle the expected case of empty cache using the exception. 
There is a slight performance penalty in catching an exception.

But it is true that the key should be available most of the time..
Line 58:     except KeyError:
Line 59:         # Make sure we do not crash if the cache is suddenly
Line 60:         # invalidated
Line 61:         pass


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Gerrit-MessageType: comment
Gerrit-Change-Id: I135143bccdd29697ec673819212193c0fc217e56
Gerrit-PatchSet: 7
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Martin Sivák <[email protected]>
Gerrit-Reviewer: Dan Kenigsberg <[email protected]>
Gerrit-Reviewer: Francesco Romani <[email protected]>
Gerrit-Reviewer: Gilad Chaplik <[email protected]>
Gerrit-Reviewer: Martin Sivák <[email protected]>
Gerrit-Reviewer: [email protected]
Gerrit-Reviewer: oVirt Jenkins CI Server
Gerrit-HasComments: Yes
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