linux-stable.git/tools/lib/traceevent/event-parse.h, branch linux-3.19.y

tools lib traceevent: Added support for __get_bitmask() macro

2014-06-07T21:33:37+00:00

Coming in v3.16, trace events will be able to save bitmasks in raw
format in the ring buffer and output it with the __get_bitmask() macro.

In order for userspace tools to parse this, it must be able to handle
the __get_bitmask() call and be able to convert the data that's in
the ring buffer into a nice bitmask format. The output is similar to
what the kernel uses to print bitmasks, with a comma separator every
4 bytes (8 characters).

This allows for cpumasks to also be saved efficiently.

The first user is the thermal:thermal_power_limit event which has the
following output:

 thermal_power_limit:  cpus=0000000f freq=1900000 cdev_state=0 power=5252

Link: http://lkml.kernel.org/r/20140506132238.22e136d1@gandalf.local.home

Suggested-by: Javi Merino 
Signed-off-by: Steven Rostedt 
Acked-by: Namhyung Kim 
Tested-by: Javi Merino 
Link: http://lkml.kernel.org/r/20140603032224.229186537@goodmis.org
Signed-off-by: Jiri Olsa

tools lib traceevent: Add options to plugins

2014-06-07T21:33:36+00:00

The traceevent plugins allows developers to have their events print out
information that is more advanced than what can be achieved by the
trace event format files.

As these plugins are used on the userspace side of the tracing tools, it
is only logical that the tools should be able to produce different types
of output for the events. The types of events still need to be defined by
the plugins thus we need a way to pass information from the tool to the
plugin to specify what type of information to be shown.

Not only does the information need to be passed by the tool to plugin, but
the plugin also requires a way to notify the tool of what options it can
provide.

This builds the plugin option infrastructure that is taken from trace-cmd
that is used to allow plugins to produce different output based on the
options specified by the tool.

Signed-off-by: Steven Rostedt 
Acked-by: Namhyung Kim 
Link: http://lkml.kernel.org/r/20140603184154.0a4c031c@gandalf.local.home
Signed-off-by: Jiri Olsa

tools lib traceevent: Add flag to not load event plugins

2014-06-07T21:33:36+00:00

Add a flag to pevent that will let the callers be able to set it and
keep the system, and perhaps even normal plugins from being loaded.

This is useful when plugins might hide certain information and seeing
the raw events shows what may be going on.

Signed-off-by: Steven Rostedt 
Acked-by: Namhyung Kim 
Link: http://lkml.kernel.org/r/20140603032223.678098063@goodmis.org
Signed-off-by: Jiri Olsa

tools lib traceevent: Fix backward compatibility macros for pevent filter enums

2014-04-23T11:19:23+00:00

The return value for pevent_filter_match() is suppose to return FILTER_NONE
if the event doesn't have a filter, and FILTER_NOEXIST if there is no filter
at all. But the change 41e12e580a7 "tools lib traceevent: Refactor
pevent_filter_match() to get rid of die()" replaced the return value
with PEVENT_ERRNO__* values and added "backward compatibility" macros
that used the old names. Unfortunately, the NOEXIST and NONE macros were
swapped, and this broke users that use the old return names.

Signed-off-by: Steven Rostedt 
Link: http://lkml.kernel.org/r/20140421222346.0351ced4@gandalf.local.home
Signed-off-by: Jiri Olsa

tools lib traceevent: Add pevent_unregister_print_function()

2014-01-16T19:26:24+00:00

When a plugin unloaded it needs to unregister its print handler from
pevent.

So add an unregister function to do it.

Signed-off-by: Namhyung Kim 
Reviewed-by: Jiri Olsa 
Acked-by: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/r/1389839478-5887-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Add pevent_unregister_event_handler()

2014-01-16T19:26:24+00:00

When a plugin is unloaded it needs to unregister its handler from pevent.

So add an unregister function to do it.

Signed-off-by: Namhyung Kim 
Reviewed-by: Jiri Olsa 
Acked-by: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/r/1389839478-5887-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Make plugin unload function receive pevent

2014-01-15T18:10:40+00:00

The PEVENT_PLUGIN_UNLOADER function might need some cleanup using pevent
like unregister some handlers.  So pass pevent as argument.

Signed-off-by: Namhyung Kim 
Reviewed-by: Jiri Olsa 
Acked-by: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/r/1389750340-15965-6-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Add state member to struct trace_seq

2014-01-15T18:10:19+00:00

The trace_seq->state is for tracking errors during the use of trace_seq
APIs and getting rid of die() in it.

Signed-off-by: Namhyung Kim 
Reviewed-by: Jiri Olsa 
Acked-by: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/r/87fvopalbb.fsf@sejong.aot.lge.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Introduce pevent_filter_strerror()

2013-12-18T17:47:58+00:00

The pevent_filter_strerror() function is for receiving actual error
message from pevent_errno value.  To do that, add a static buffer to
event_filter for saving internal error message

If a failed function saved other information in the static buffer
returns the information, otherwise returns generic error message.

Signed-off-by: Namhyung Kim 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/r/1386833777-3790-15-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Refactor pevent_filter_match() to get rid of die()

2013-12-13T13:30:22+00:00

The test_filter() function is for testing given filter is matched to a
given record.  However it doesn't handle error cases properly so add a
new argument err to save error info during the test and also pass it to
internal test functions.

The return value of pevent_filter_match() also converted to pevent_errno
to indicate an exact error case.

Signed-off-by: Namhyung Kim 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/r/1386833777-3790-13-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo