Re: [vdsm] Change in vdsm[master]: report cpuUser and cpuSys separately

[Ryan Harper]

* Mark Wu <wudxw(a)linux.vnet.ibm.com&gt; [2012-09-07 05:00]:
>  Mark Wu has posted comments on this change.
>  
>  Change subject: report cpuUser and cpuSys separately
>  ......................................................................
>  
>  
>  Patch Set 1:
>  
>  Here's the cpustats of a running vm:
>  
>  virsh # cpu-stats 3
>  CPU0:
>  	cpu_time           152.626922854 seconds
>  CPU1:
>  	cpu_time           460.343462849 seconds
>  CPU2:
>  	cpu_time            37.569566994 seconds
>  CPU3:
>  	cpu_time            21.092908393 seconds
>  Total:
>  	cpu_time           671.632861090 seconds
>  	user_time            3.440000000 seconds
>  	system_time         18.380000000 seconds
>  
>  You can see cpu_time is much bigger than the sum of user_time and
>  system_time, because the guest time is not reported here. So most cpu
>  time is used to run guest code. It makes sense!  For a qemu-kvm
>  process, user_time represents the time used by qemu, and system_time
>  represents the time used by kvm module, which doesn't contain guest
>  time. I am not sure if this is what you expect. It could be a little
>  bit confusing for user. 
I think it's useful to split the data out seperately for debugging
purposes, not clear to me that the user is interested in the break down.
Advanced performance tuning will definitely want to observe the data as
well as users looking to debug issues.

I don't see the harm in adding additional information.


>  
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>  Gerrit-MessageType: comment
>  Gerrit-Change-Id: I663ad25ff3ff5ce426b5159b6c9a65b7f5167605
>  Gerrit-PatchSet: 1
>  Gerrit-Project: vdsm
>  Gerrit-Branch: master
>  Gerrit-Owner: Laszlo Hornyak <lhornyak(a)redhat.com&gt;
>  Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
>  Gerrit-Reviewer: Gal Hammer <ghammer(a)redhat.com&gt;
>  Gerrit-Reviewer: Laszlo Hornyak <lhornyak(a)redhat.com&gt;
>  Gerrit-Reviewer: Mark Wu <wudxw(a)linux.vnet.ibm.com&gt;
>  Gerrit-Reviewer: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;
>  Gerrit-Reviewer: oVirt Jenkins CI Server
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-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh(a)us.ibm.com