user/sven/linux.git/kernel/trace/trace_sched_switch.c, branch v3.9.7

tracing: Use irq_work for wake ups and remove _nowake_() functions

2012-11-02T14:21:52Z

Have the ring buffer commit function use the irq_work infrastructure to wake up any waiters waiting on the ring buffer for new data. The irq_work was created for such a purpose, where doing the actual wake up at the time of adding data is too dangerous, as an event or function trace may be in the midst of the work queue locks and cause deadlocks. The irq_work will either delay the action to the next timer interrupt, or trigger an IPI to itself forcing an interrupt to do the work (in a safe location). With irq_work, all ring buffer commits can safely do wakeups, removing the need for the ring buffer commit "nowake" variants, which were used by events and function tracing. All commits can now safely use the normal commit, and the "nowake" variants can be removed. Cc: Peter Zijlstra Signed-off-by: Steven Rostedt

tracing: Have tracing_sched_wakeup_trace() use standard unlock_commit

2012-10-31T20:45:30Z

The functon tracing_sched_wakeup_trace() does an open coded unlock commit and save stack. This is what the trace_nowake_buffer_unlock_commit() is for. Signed-off-by: Steven Rostedt

tracing: Remove obsolete sched_switch tracer

2011-02-08T22:14:56Z

The trace events sched_switch and sched_wakeup do the same thing as the stand alone sched_switch tracer does. It is no longer needed. Signed-off-by: Steven Rostedt

tracing: Let tracepoints have data passed to tracepoint callbacks

2010-05-14T13:50:34Z

This patch adds data to be passed to tracepoint callbacks. The created functions from DECLARE_TRACE() now need a mandatory data parameter. For example: DECLARE_TRACE(mytracepoint, int value, value) Will create the register function: int register_trace_mytracepoint((void(*)(void *data, int value))probe, void *data); As the first argument, all callbacks (probes) must take a (void *data) parameter. So a callback for the above tracepoint will look like: void myprobe(void *data, int value) { } The callback may choose to ignore the data parameter. This change allows callbacks to register a private data pointer along with the function probe. void mycallback(void *data, int value); register_trace_mytracepoint(mycallback, mydata); Then the mycallback() will receive the "mydata" as the first parameter before the args. A more detailed example: DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status)); /* In the C file */ DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status)); [...] trace_mytracepoint(status); /* In a file registering this tracepoint */ int my_callback(void *data, int status) { struct my_struct my_data = data; [...] } [...] my_data = kmalloc(sizeof(*my_data), GFP_KERNEL); init_my_data(my_data); register_trace_mytracepoint(my_callback, my_data); The same callback can also be registered to the same tracepoint as long as the data registered is different. Note, the data must also be used to unregister the callback: unregister_trace_mytracepoint(my_callback, my_data); Because of the data parameter, tracepoints declared this way can not have no args. That is: DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS()); will cause an error. If no arguments are needed, a new macro can be used instead: DECLARE_TRACE_NOARGS(mytracepoint); Since there are no arguments, the proto and args fields are left out. This is part of a series to make the tracepoint footprint smaller: text data bss dec hex filename 4913961 1088356 861512 6863829 68bbd5 vmlinux.orig 4914025 1088868 861512 6864405 68be15 vmlinux.class 4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint Again, this patch also increases the size of the kernel, but lays the ground work for decreasing it. v5: Fixed net/core/drop_monitor.c to handle these updates. v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the #ifdef CONFIG_TRACE_POINTS, since the two are the same in both cases. The __DECLARE_TRACE() is what changes. Thanks to Frederic Weisbecker for pointing this out. v3: Made all register_* functions require data to be passed and all callbacks to take a void * parameter as its first argument. This makes the calling functions comply with C standards. Also added more comments to the modifications of DECLARE_TRACE(). v2: Made the DECLARE_TRACE() have the ability to pass arguments and added a new DECLARE_TRACE_NOARGS() for tracepoints that do not need any arguments. Acked-by: Mathieu Desnoyers Acked-by: Masami Hiramatsu Acked-by: Frederic Weisbecker Cc: Neil Horman Cc: David S. Miller Signed-off-by: Steven Rostedt

sched: Remove rq argument to the tracepoints

2010-05-07T09:28:17Z

struct rq isn't visible outside of sched.o so its near useless to expose the pointer, also there are no users of it, so remove it. Acked-by: Steven Rostedt Signed-off-by: Peter Zijlstra LKML-Reference: <1272997616.1642.207.camel@laptop> Signed-off-by: Ingo Molnar

tracing: pass around ring buffer instead of tracer

2009-09-04T22:59:39Z

The latency tracers (irqsoff and wakeup) can swap trace buffers on the fly. If an event is happening and has reserved data on one of the buffers, and the latency tracer swaps the global buffer with the max buffer, the result is that the event may commit the data to the wrong buffer. This patch changes the API to the trace recording to be recieve the buffer that was used to reserve a commit. Then this buffer can be passed in to the commit. Signed-off-by: Steven Rostedt

tracing: Move sched event insertion helpers in the sched switch tracer file

2009-08-06T05:28:06Z

The sched events helpers which insert the sched switch and wakeup events into the ring buffer currently reside in trace.c But this file is quite overloaded and the right place for these helpers is in the sched switch tracer file. Then move them to trace_functions.c Signed-off-by: Frederic Weisbecker Cc: Steven Rostedt

tracing/events: move trace point headers into include/trace/events

2009-04-15T02:05:43Z

Impact: clean up Create a sub directory in include/trace called events to keep the trace point headers in their own separate directory. Only headers that declare trace points should be defined in this directory. Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Neil Horman Cc: Zhao Lei Cc: Eduard - Gabriel Munteanu Cc: Pekka Enberg Signed-off-by: Steven Rostedt

ftrace: clean up enable logic for sched_switch

2009-04-07T12:43:09Z

Unify sched_switch and sched_wakeup's action to following logic: Do record_cmdline when start_cmdline_record() is called. Start tracing events when the tracer is started. Signed-off-by: Zhao Lei LKML-Reference: <49D1C596.5050203@cn.fujitsu.com> Signed-off-by: Steven Rostedt

ftrace: Add check of sched_stopped for probe_sched_wakeup

2009-04-07T12:01:11Z

The wakeup tracing in sched_switch does not stop when a user disables tracing. This is because the probe_sched_wakeup() is missing the check to prevent the wakeup from being traced. Signed-off-by: Zhao Lei LKML-Reference: <49D1C543.3010307@cn.fujitsu.com> Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar