[Xen-devel] [PATCH 2/2] Output Virtual Block Device requests information for xentop

["Satoshi Uchida" <s-uchida@xxxxxxxxxxxxx>]

This patch adds VBD statistical information into xentop.
Our new xentop collects I/O requests from sysfs and displays them.

This is an example output of the new xentop in the case of 4 VMs.

xentop - 22:26:21   Xen 3.0-unstable
2 domains: 1 running, 1 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 2620476k total, 2128336k used, 492140k free    CPUs: 2 @ 2992MHz
      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) 
VCPUS NETS NETTX(k) NETRX(k)     VBDS   VBD_OO   VBD_RD   VBD_WR SSID
  Domain-0 -----r        279   31.4    1048628   40.0   no limit       n/a     
2    8    53668     3761    0        0        0        0    0
  VM1        --b---         14    0.1    1048352   40.0    1048576      40.0    
 2    1        1      645    1        0     1435      733    0

 Delay  Networks  vBds  VCPUs  Repeat header  Sort order  Quit

As compared with the traditional xentop, new statistical information (VBDS, 
VBD_OO, VBD_RD and VBD_WR) is added.


In detail mode, outputs of xentop is as follows.

xentop - 22:26:39   Xen 3.0-unstable
2 domains: 1 running, 1 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 2620476k total, 2128336k used, 492140k free    CPUs: 2 @ 2992MHz
      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) 
VCPUS NETS NETTX(k) NETRX(k)     VBDS   VBD_OO   VBD_RD   VBD_WR SSID
  Domain-0 -----r        284   17.4    1048580   40.0   no limit       n/a     
2    8    56148     3885    0        0        0        0    0
  VM1        --b---         14    0.0    1048400   40.0    1048576      40.0    
 2    1        1      662    1        0     1435      736    0
VBD 2049 [ 8: 1]  OO:       0   RD:     1435   WR:      736

  Delay  Networks  vBds  VCPUs  Repeat header  Sort order  Quit


Information about each VBD is displayed under a line of corresponding domain.

This patch is practically no change from previous patch.
Only the location of code  is changed, and insert code which transfers from dev 
information to major and minor information.


Thanks,
Satoshi UCHIDA

Add_VBD_info_to_xentop.patch
Description: Binary data

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