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Daniel P. Berrange 511e7c5bba qemu: add reporting of vCPU wait time
The VIR_DOMAIN_STATS_VCPU flag to virDomainListGetStats
enables reporting of stats about vCPUs. Currently we
only report the cumulative CPU running time and the
execution state.

This adds reporting of the wait time - time the vCPU
wants to run, but the host scheduler has something else
running ahead of it.

The data is reported per-vCPU eg

$ virsh domstats --vcpu demo
 Domain: 'demo'
   vcpu.current=4
   vcpu.maximum=4
   vcpu.0.state=1
   vcpu.0.time=1420000000
   vcpu.0.wait=18403928
   vcpu.1.state=1
   vcpu.1.time=130000000
   vcpu.1.wait=10612111
   vcpu.2.state=1
   vcpu.2.time=110000000
   vcpu.2.wait=12759501
   vcpu.3.state=1
   vcpu.3.time=90000000
   vcpu.3.wait=21825087

In implementing this I notice our reporting of CPU execute
time has very poor granularity, since we are getting it
from /proc/$PID/stat. As a future enhancement we should
prefer to get CPU execute time from /proc/$PID/schedstat
or /proc/$PID/sched (if either exist on the running kernel)

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-01-26 14:34:23 +00:00
2016-01-04 13:56:35 -07:00
2016-01-12 17:16:33 +01:00
2016-01-04 13:56:35 -07:00
2016-01-12 18:51:38 +01:00
2016-01-17 10:29:57 +08:00
2016-01-26 14:34:23 +00:00
2013-07-18 08:47:21 +02:00
2016-01-04 13:56:35 -07:00
2014-04-21 16:49:08 -06:00
2015-06-16 13:46:20 +02:00
2016-01-17 10:29:57 +08:00
2014-05-06 16:20:24 -06:00
2014-06-26 14:32:35 +01:00

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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