lttng Package

lttng Module

Trace kernel events with Linux Tracing Toolkit (lttng). You need to install the lttng patched kernel in order to use the profiler.

Examples:

job.profilers.add(‘lttng’, tracepoints = None): enable all trace points. job.profilers.add(‘lttng’, tracepoints = []): disable all trace points. job.profilers.add(‘lttng’, tracepoints = [‘kernel_arch_syscall_entry’,

‘kernel_arch_syscall_exit’])

will only trace syscall events.

Take a look at /proc/ltt for the list of the tracing events currently supported by lttng and their output formats.

To view the collected traces, copy results/your-test/profiler/lttng to a machine that has Linux Tracing Toolkit Viewer (lttv) installed:

test$ scp -r results/your-test/profiler/lttng user@localmachine:/home/tmp/

Then you can examine the traces either in text mode or in GUI:

localmachine$ lttv -m textDump -t /home/tmp/lttng

or

localmachine$ lttv-gui -t /home/tmp/lttng &

class autotest.client.profilers.lttng.lttng.lttng(job)

Bases: autotest.client.profiler.profiler

initialize(outputsize=1048576, tracepoints=None, **dargs)

setup(tarball='ltt-control-0.51-12082008.tar.gz', **dargs)

start(test)

stop(test)

version = 1