xenopsd manages VMs running

• on Xen, via direct libxc calls
• on Xen/KVM via libvirt [experimental]
• on KVM via qemu directly [experimental]

and provides a simple RPC control interface to the layer above (typically xapi).

This branch adds coverage profiling with bisect_ppx. Binaries write bisect*.out files, when they exit to the current directory. These files can be analysed with bisect-ppx-report:

bisect-ppx-report -I _build -html coverage     *.out
bisect-ppx-report -I _build -text coverage.txt *.out

By default, an instrumented binary writes to $CWD/bisect*.out. In the case of xenopsd in producition, this would be /. To avoid writing to / and to avoid several services writing to the same place, start xenopsd binaries with an evironment variable pointing to a better place:

BISECT_FILE="/tmp/xenopsd-bisect"