linux-toradex.git/kernel/trace/trace_nop.c, branch v3.4.73

tracing/ftrace: make nop-tracer use polling wait for events on pipe

2009-03-23T08:22:15+00:00

Impact: display events when they arrive

Now that the events don't use wake_up() anymore, we need the nop
tracer to poll waiting for events on the pipe. Especially because
nop is useful to look at orphan traces types (traces types that
don't rely on specific tracers) because it doesn't produce traces
itself.

And unlike other tracers that trigger specific traces periodically,
nop triggers no traces by itself that can wake him.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
LKML-Reference: <1237759847-21025-5-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar

trace: Call tracing_reset_online_cpus before tracer->init()

2009-02-06T00:01:41+00:00

Impact: cleanup

To make it easy for ftrace plugin writers, as this was open coded in
the existing plugins

Signed-off-by: Arnaldo Carvalho de Melo 
Acked-by: Frédéric Weisbecker 
Signed-off-by: Ingo Molnar

trace: Use tracing_reset_online_cpus in more places

2009-01-29T13:28:31+00:00

Impact: cleanup

Signed-off-by: Arnaldo Carvalho de Melo 
Acked-by: Frédéric Weisbecker 
Signed-off-by: Ingo Molnar

tracing/ftrace: make nop tracer using tracer flags

2008-11-18T10:10:59+00:00

Impact: give an example on how to use specific tracer flags

This patch propose to use the nop tracer to provide an
example for using the tracer's custom flags implementation.

V2: replace structures and defines just after the headers includes for
    cleanliness.
V3: replace defines by enum values.

Signed-off-by: Frederic Weisbecker 
Acked-by: Steven Noonan 
Acked-by: Steven Rostedt 
Signed-off-by: Ingo Molnar

tracing/ftrace: change the type of the init() callback

2008-11-16T06:55:23+00:00

Impact: extend the ->init() method with the ability to fail

This bring a way to know if the initialization of a tracer successed.
A tracer must return 0 on success and a traditional error (ie:
-ENOMEM) if it fails.

If a tracer fails to init, it is free to print a detailed warn. The
tracing api will not and switch to a new tracer will just return the
error from the init callback.

Note: this will be used for the return tracer.

Signed-off-by: Frederic Weisbecker 
Signed-off-by: Ingo Molnar

ftrace: remove trace array ctrl

2008-11-08T08:51:39+00:00

Impact: remove obsolete variable in trace_array structure

With the new start / stop method of ftrace, the ctrl variable
in the trace_array structure is now obsolete. Remove it.

Signed-off-by: Steven Rostedt 
Signed-off-by: Ingo Molnar

ftrace: remove ctrl_update method

2008-11-08T08:51:34+00:00

Impact: Remove the ctrl_update tracer method

With the new quick start/stop method of tracing, the ctrl_update
method is out of date.

Signed-off-by: Steven Rostedt 
Signed-off-by: Ingo Molnar

ftrace: make work with new ring buffer

2008-10-14T08:38:57+00:00

This patch ports ftrace over to the new ring buffer.

Signed-off-by: Steven Rostedt 
Signed-off-by: Ingo Molnar

tracing/ftrace: replace none tracer by nop tracer

2008-10-14T08:38:09+00:00

Replace "none" tracer by the recently created "nop" tracer.
Both are pretty similar except that nop accepts TRACE_PRINT
or TRACE_SPECIAL entries.

And as a consequence, changing the size of the ring buffer now
requires that tracing has already been disabled.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
Cc: Steven Noonan 
Signed-off-by: Ingo Molnar

tracing/ftrace: make nop tracer reset previous entries

2008-10-14T08:38:04+00:00

If nop tracer is selected, some old entries from the previous tracer
could still be enqueued. Tracing have to be reset.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
Cc: Steven Noonan 
Signed-off-by: Ingo Molnar