[Patch 0/2] blkiomon: I/O monitor based on blktrace data

[Martin Peschke <mp3@de.ibm.com>]

In order to analyse I/O performance problems which could be reported by
customers we want to provide a little monitoring tool. Primarily, we
would like to be able look at a history of request size and request
latency histograms per device.

The D and C traces provided by blktrace are exactly what we need for
that purpose. So, running blktrace with appropriate filters (-a option)
makes this approach feasible.

Patch 1/2 allows users to get binary output from blkparse on stdout.

Patch 2/2 contains blkiomon, an I/O monitoring tool, which reads
blkparse data from stdin and which periodically writes I/O statistics.

I would like to contribute this little tool to the blktrace source tree.
I think it would complement blkparse and btt quite well.

Martin