Xen devel - Jun 2006 - [PATCH 0/3] ADD Virtual Block Device requests information.

This series of patches provides the function to get counts of I/O requests.
This function is useful for managing I/O resources to support workload
management.

It is important to manage resources such as cpu time, physical pages and disk
I/O
 bandwidth for workload management.
In Xen, now, cpu and memory resources can be managed, but I/O resource can not
be managed.
I think that it is necessary to control allocation of I/O (disk and network)
resources,
such as disk bandwidth and network bandwidth in Xen.

Prior to developing the I/O resource management mechanism, it is reasonable to
examine
current behavior of Xen''s I/O system.
To examine network I/O behavior, we can get the statistical information of
network I/O behavior,
 such as TX and RX packets bytes, from /proc/net/dev. The information can be
also displayed by xentop.

To examine disk I/O, however, there is no function to get disk I/O behavior.
Therefore, I implemented a function for counting I/O requests around VBD back
driver.
This function is also useful to implement the I/O resource management mechanism.

The series of patch enables you to get the statistical information of VBD
behavior through
/proc/xen/vbd and display the information by xentop.

I appreciate any comments.


Thanks,
Satoshi UCHIDA


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