This patch adds requisite support to retrieve system uuid details for Power
systems. Power systems do not have DMI data. However most of the relevant details
are either in /proc or /sys. For baremetal servers, the UID is available in
/proc/device-tree/system-id. For guests the UUID is available in
/proc/device-tree/vm,uuid inside the guest. Guest's /proc filesystem do not have
/proc/device-tree/system-id
Example
On baremetal system
$cat /proc/device-tree/system-id
2122AAA
On a guest VM
$cat /proc/device-tree/vm,uuid
4b1a1a7e-079e-479c-8072-d8108f31050c
Signed-off-by: Pradipta Kr. Banerjee <bpradip@in.ibm.com>
Type can be one of "none", "noop", "deadline", "cfq".
For block devices that don't use scheduler (like dm), the type will be "none".
We'll also report "none" for partitions when we start reporting those.
This is read once at start of cAdvisor. We can use this to report
machine state as well as return logical name for block devices in UI.
Signed-off-by: Rohit Jnagal <jnagal@google.com> (github: rjnagal)
