Xen devel - Jun 2006 - [PATCH 1/1] Output Virtual Block Device requests information ver. 2. Add information to sysfs.

This patch adds VBD statistic informations to sysfs.

It creates ''statistics'' directory under each VBD directory,
and
makes a sysfs file for each statistical information of VBD.

Examples are as follows.
By applying this patch, sysfs creates "statistics" directory under the
"vbd-*" directory.
The "statistics" directory includes three statistical information
files  of VBD;
 oo_req, rd_req, wr_req. 

  [root@Domain-0 ~]# ls /sys/devices/xen-backend/vbd-1-2049/
  bus      driver  nodename         power       uevent
  devtype  mode    physical_device  statistics
  [root@Domain-0 ~]# ls /sys/devices/xen-backend/vbd-1-2049/statistics/
  oo_req  rd_req  wr_req
  [root@Domain-0 ~]# cat /sys/devices/xen-backend/vbd-1-2049/statistics/oo_req
  0
  [root@Domain-0 ~]# cat /sys/devices/xen-backend/vbd-1-2049/statistics/rd_req
  1592
  [root@Domain-0 ~]# cat /sys/devices/xen-backend/vbd-1-2049/statistics/wr_req
  565
  [root@Domain-0 ~]#


Thanks,
Satoshi UCHIDA


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