Hu Tao fe0aac0503 Adds support to param 'vcpu_time' in qemu_driver.
This involves setting the cpuacct cgroup to a per-vcpu granularity,
as well as summing the each vcpu accounting into a common array.
Now that we are reading more than one cgroup file, we double-check
that cpus weren't hot-plugged between reads to invalidate our
summing.

Signed-off-by: Eric Blake <eblake@redhat.com>
2012-05-18 08:53:49 -06:00
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