[PATCH] dot_flow_graph.stp tapset

[William Cohen]

When trying to better understand how the various bio flow through the
the block io trace points I made a script to plot out the path that
various struct bio pointers take between the various trace points.  I
have factored out the graphing code into a tapset, dot_flow_graph.stp
and have a simple-minded script, block_graph.stp to demonstrate its
use. It doesn't take into account that bio structs getting merged with
other bio operations.  However, people might still find the code useful.
Below is the command line used to produce a simple state diagram using the tapset:

stap -v /tmp/block_graph.stp -c 'sleep 20'|dot -Tsvg -o /tmp/fsm.svg 

Attached are the patch for the dot_flow_graph.stp, block_graph.stp,
and example output.

Any feedback on the tapset would be appreciated.

-Will
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