Re: [Xen-devel] Retrieving the precise guest start time via libxc or similar?

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 02/28/2017 02:36 PM, Razvan Cojocaru wrote:
> Hello,
> 
> xc_domain_getinfo() gets us info->cpu_time, which, if I understand
> correctly, is the guest uptime.
> 
> Is there an officially sanctioned way of retrieving the _exact_ guest
> start time? Obviously we can compute an approximation by doing now -
> info->cpu_time, but we'd like to be able to uniquely identify an OS boot
> -> shutdown cycle, and the difference method is not guaranteed to always
> yield the same result for the same running OS.

Nevermind, found /local/domain/<DOMAIN_ID>/vm/start_time. Seems to do
the trick nicely.


Thanks,
Razvan

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