[PATCH 0/8] [GIT PULL] TRACE_EVENT for modules

Steven Rostedt
2009-04-14T17:27:21Z

Ingo,

This is the long awaited TRACE_EVENT for modules patch series.

Not only does it allow for modules to use the TRACE_EVENT infrastructure,
but it also cleans up the way TRACE_EVENTS are used in core kernel code.

Some of the clean ups are:

Removal of the two headers per trace system. No need to have
include/trace/sched.h and include/linux/sched_event_types.h
All the changes go into include/trace/sched.h. But note that how that
file is made is important. One could look at the sched.h file, or
skb.h, lockdep.h and kmem.h as an example.

Another clean up is that I got rid of the need to add these files
into include/trace/trace_events.h and include/trace/trace_event_types.h.
Those files have been deleted.

Another clean up is that we do not need to do the DEFINE_TRACE(name)
for every TRACE_EVENT (or TRACE_FORMAT and DECLARE_TRACE) in the
include/trace/ header. One only needs to define a CREATE_TRACE_POINTS
in one C file to do the work for them:

#define CREATE_TRACE_POINTS
#inlude <trace/sched.h>

That will do the DEFINE_TRACE for every defined trace item in sched.h.

I also removed the trace_events_stage_X.h files and combined them
into a include/trace/ftrace.h file.

I made sure that each stage did not break the code. Well, I tested
kmem at each level. kmem seems to be the most complex of the trace events.

At the end I made a module and tested it out as well. I even removed
the module as the trace was running. Note, if you remove the file
and view the trace, you will get something like:

<...>-4197 [002] 205.524992: Unknown type 47
<...>-4197 [002] 206.523325: Unknown type 47
<...>-4197 [002] 207.521665: Unknown type 47
<...>-4197 [002] 208.520118: Unknown type 47

The unknown type will appear. This is because the format to print the
string is in the module itself. When the code is removed, ftrace has
no way of knowing how to print that string out. But if you had a user
space tool that read the format file first, it could still parse the binary
data just fine.

Please pull the latest tip/tracing/core tree, which can be found at:

git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git
tip/tracing/core

Steven Rostedt (8):
tracing: consolidate trace and trace_event headers
tracing: create automated trace defines
tracing: make trace_seq operations available for core kernel
tracing/events: move declarations from trace directory to core include
tracing/events: move the ftrace event tracing code to core
tracing/events: convert event call sites to use a link list
tracing/events: add export symbols for trace events in modules
tracing/events: add support for modules to TRACE_EVENT

----
include/linux/ftrace_event.h | 150 +++++++++++
include/linux/module.h | 4 +
include/linux/trace_seq.h | 91 +++++++
include/linux/tracepoint.h | 9 +-
include/trace/define_trace.h | 79 ++++++
include/trace/ftrace.h | 493 +++++++++++++++++++++++++++++++++++
include/trace/irq.h | 56 ++++-
include/trace/irq_event_types.h | 55 ----
include/trace/kmem.h | 189 +++++++++++++-
include/trace/lockdep.h | 55 ++++-
include/trace/lockdep_event_types.h | 57 ----
include/trace/sched.h | 336 +++++++++++++++++++++++-
include/trace/sched_event_types.h | 337 ------------------------
include/trace/skb.h | 39 +++-
include/trace/skb_event_types.h | 38 ---
include/trace/trace_event_types.h | 7 -
include/trace/trace_events.h | 7 -
kernel/exit.c | 4 -
kernel/fork.c | 2 -
kernel/irq/handle.c | 7 +-
kernel/kthread.c | 3 -
kernel/lockdep.c | 12 +-
kernel/module.c | 7 +
kernel/sched.c | 10 +-
kernel/signal.c | 2 -
kernel/softirq.c | 3 -
kernel/trace/Makefile | 1 -
kernel/trace/events.c | 14 -
kernel/trace/trace.c | 3 +
kernel/trace/trace.h | 148 +----------
kernel/trace/trace_event_profile.c | 4 +-
kernel/trace/trace_events.c | 170 +++++++++----
kernel/trace/trace_events_filter.c | 10 +-
kernel/trace/trace_events_stage_1.h | 39 ---
kernel/trace/trace_events_stage_2.h | 170 ------------
kernel/trace/trace_events_stage_3.h | 279 --------------------
kernel/trace/trace_output.c | 3 +
kernel/trace/trace_output.h | 30 +--
mm/util.c | 11 +-
net/core/net-traces.c | 4 +-
40 files changed, 1648 insertions(+), 1290 deletions(-)
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