[Libvir] [PATCH] Block device and network stats (version 2)

[Richard W.M. Jones]

Daniel P. Berrange wrote:
[about requests vs sectors]
> Yes, we need both. If we can't find actual request sizes for Xen, we should 
> make a note and see if its possible add this to future Xen kernel backend
> drivers.

I notice that in the version of Xen in Fedora 7, we now have the 
following statistics files, although for partition-backed paravirt 
domains only:

# ls /sys/devices/xen-backend/vbd-6-51712/statistics/
br_req  oo_req  rd_req  rd_sect  wr_req  wr_sect

rd_sect / wr_sect contain sectors, so if we can assume 512 bytes/sector 
then we could fill in the bytes fields.

The Xen block device stats collection code needs some work anyway in 
order to support hdX devices and fullvirt domains (where the statistics 
files are called tap_XX_req etc.)

Rich.

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