ftrace Package¶

`ftrace` Module¶

Function tracer profiler for autotest.

author:	David Sharp (dhsharp@google.com)

class autotest.client.profilers.ftrace.ftrace.ftrace(job)[source]¶

ftrace profiler for autotest. It builds ftrace from souce and runs trace-cmd with configurable parameters.

@see: git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

initialize(tracepoints, buffer_size_kb=1408, **kwargs)[source]¶

Initialize ftrace profiler.

Parameters:	tracepoints – List containing a mix of tracpoint names and (tracepoint name, filter) tuples. Tracepoint names are as accepted by trace-cmd -e, eg “syscalls”, or “syscalls:sys_enter_read”. Filters are as accepted by trace-cmd -f, eg “((sig >= 10 && sig < 15) \|\| sig == 17)” buffer_size_kb – Set the size of the ring buffer (per cpu).

static join_command()[source]¶

Shell escape the command for BgJob. grmbl.

Parameters:	cmd – Command list.

setup(tarball='trace-cmd.tar.bz2', **kwargs)[source]¶

Build and install trace-cmd from source.

The tarball was obtained by checking the git repo at 09-14-2010, removing the Documentation and the .git folders, and compressing it.

Parameters:	tarball – Path to trace-cmd tarball. **kwargs – Dictionary with additional parameters.

start(test)[source]¶

Start ftrace profiler

Parameters:	test – Autotest test in which the profiler will operate on.

stop(test)[source]¶

Stop ftrace profiler.

Parameters:	test – Autotest test in which the profiler will operate on.