qemu-io: add option to enable tracing
It can be useful to enable QEMU tracing when trying out block layer interfaces via qemu-io. Tracing can be enabled using the new -T FILE option where the given file contains a list of trace events to enable (just like the qemu --trace events=FILE option). $ echo qemu_vfree >my-events $ ./qemu-io -T my-events ... Remember to use ./configure --enable-trace-backend=BACKEND when building qemu-io. Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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