trace: Add LTTng Userspace Tracer backend
This patch adds LTTng Userspace Tracer (UST) backend support. The UST system requires no kernel support but libust and liburcu must be installed. $ ./configure --trace-backend ust $ make Start the UST daemon: $ ustd & List available tracepoints and enable some: $ ustctl --list-markers $(pgrep qemu) [...] {PID: 5458, channel/marker: ust/paio_submit, state: 0, fmt: "acb %p opaque %p sector_num %lu nb_sectors %lu type %lu" 0x4b32ba} $ ustctl --enable-marker "ust/paio_submit" $(pgrep qemu) Run the trace: $ ustctl --create-trace $(pgrep qemu) $ ustctl --start-trace $(pgrep qemu) [...] $ ustctl --stop-trace $(pgrep qemu) $ ustctl --destroy-trace $(pgrep qemu) Trace results can be viewed using lttv-gui. More information about UST: http://lttng.org/ustSigned-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> trace: Check for LTTng Userspace Tracer headers When using the 'ust' backend, check if the relevant headers are available at host. Signed-off-by: NPrerna Saxena <prerna@linux.vnet.ibm.com> Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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