[Users] Getting CPU idle time of CT outside the CT

[Todd Mueller]

Can you clarify what you are trying to accomplish? Are you trying to
identify containers using excessive CPU?

On Mon, Jul 21, 2014 at 10:06 AM, Pavel Snajdr <lists at snajpa.net> wrote:
> Hello,
>
> is there any way how to get CPU idle % of CT outside out of the CT?
>
> We were trying to figure this out from /proc/vz/vestat, first try was to
> divide used/idle, but idle seems to be accounted for all available
> hwnode CPUs and used seems to be accounted for CPUs available to the CT;
> in the end it was giving a pretty reasonable numbers in low CPU load
> situations, but when the CT was maxing out its available CPUs, we were
> getting 100+% CPU load.
>
> Next thing we've tried is to look into user,nice and system values, but
> there is no idle nor total number of available jiffies to compare to.
>
> Another thing we've tried is to read /proc/stat from outside of the CT,
> but that is a problem, since ve->veid is 0 when running a process to
> read out /vz/root/<veid>/proc/stat.
>
> Solution of a last resort seems to be to run mpstat (or equivalent)
> inside of the CT via vzctl exec and watch its output. But that gives me
> hundreds of unnecessary running processes - I need to monitor hundreds
> of CTs per hwnode. That's kind of a pain :)
>
> Is there any better way to do this or what am I doing wrong?
>
> Our kernel is 042stab092.2.
>
> - snajpa
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