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* ftrace: trace next statePeter Zijlstra2008-05-232-10/+26
| | | | | | Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: sched specialIngo Molnar2008-05-233-3/+30
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: sched tree fixIngo Molnar2008-05-231-14/+21
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: include cpu in stacktraceIngo Molnar2008-05-231-15/+11Star
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: iter ctrl fixIngo Molnar2008-05-231-0/+5
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: fix cmdline tracingIngo Molnar2008-05-231-4/+4
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: make use of tracing_cpumaskIngo Molnar2008-05-231-31/+64
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add tracing_cpumaskIngo Molnar2008-05-231-8/+70
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: trace scheduler rbtreeIngo Molnar2008-05-233-2/+6
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: fix __trace_special()Ingo Molnar2008-05-231-4/+0Star
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: fix wakeupsIngo Molnar2008-05-232-4/+29
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: trace curr/next tasksIngo Molnar2008-05-231-1/+12
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: sched tracer, trace full rbtreeIngo Molnar2008-05-234-43/+85
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: make nostacktrace the defaultIngo Molnar2008-05-231-1/+1
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: sched tracer fixIngo Molnar2008-05-232-11/+4Star
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add stack tracingIngo Molnar2008-05-233-18/+97
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add wakeup events to sched tracerIngo Molnar2008-05-235-5/+88
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: remove notraceIngo Molnar2008-05-238-130/+130
| | | | | | | | now that we have a kbuild method for notrace, no need to pollute the C code with the annotations. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: disable -pg for the tracer itselfIngo Molnar2008-05-231-0/+8
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: remove address of function namesSteven Rostedt2008-05-231-2/+2
| | | | | | | | | | | | | PowerPC is very fragile when it comes to use of function names and function addresses. ftrace needs to either use all function addresses or function names (i.e. my_func as suppose to &my_func). This patch chooses to use the names and not the addresses, and makes ftrace consistent. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: cleanupsIngo Molnar2008-05-233-4/+5
| | | | | | | clean up recent code. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add trace_function api for other tracers to useSteven Rostedt2008-05-234-11/+17
| | | | | | | | | | | | | | | | A new check was added in the ftrace function that wont trace if the CPU trace buffer is disabled. Unfortunately, other tracers used ftrace() to write to the buffer after they disabled it. The new disable check makes these calls into a nop. This patch changes the __ftrace that is called without the check into a new api for the other tracers to use, called "trace_function". The other tracers use this interface instead when the trace CPU buffer is already disabled. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: allow the event pipe to be polledSoeren Sandmann Pedersen2008-05-231-1/+38
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: build fixIngo Molnar2008-05-231-0/+6
| | | | | | | | no need to backmerge, only affects ftrace-enabled kernels. (which is not the default) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: introduce the "hex" output methodIngo Molnar2008-05-231-1/+92
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: build fixIngo Molnar2008-05-232-46/+67
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: use cpu clock againIngo Molnar2008-05-231-53/+1Star
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: enabled tracing by defaultSteven Rostedt2008-05-231-1/+3
| | | | | | | | This patch is the correct way to have tracing enabled by default. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: disable tracing on failureSteven Rostedt2008-05-232-9/+107
| | | | | | | | | | | | | | Since ftrace touches practically every function. If we detect any anomaly, we want to fully disable ftrace. This patch adds code to try shutdown ftrace as much as possible without doing any more harm is something is detected not quite correct. This only kills ftrace, this patch does have checks for other parts of the tracer (irqsoff, wakeup, etc.). Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace - fix dynamic ftrace memory leakSteven Rostedt2008-05-231-3/+42
| | | | | | | | | | | | | | | | | | | | The ftrace dynamic function update allocates a record to store the instruction pointers that are being modified. If the modified instruction pointer fails to update, then the record is marked as failed and nothing more is done. Worse, if the modification fails, but the record ip function is still called, it will allocate a new record and try again. In just a matter of time, will this cause a serious memory leak and crash the system. This patch plugs this memory leak. When a record fails, it is included back into the pool of records to be used. Now a record may fail over and over again, but the number of allocated records will not increase. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: pipe fixesSteven Rostedt2008-05-231-8/+7Star
| | | | | | | | Some fixes for better output with the trace pipe. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace, locking fixIngo Molnar2008-05-231-6/+9
| | | | | | | should be an irq-safe lock ... Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add trace_special()Ingo Molnar2008-05-232-0/+59
| | | | | | | for ad-hoc tracing. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: bin-outputIngo Molnar2008-05-231-0/+50
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add raw outputIngo Molnar2008-05-231-8/+55
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: clean-up-pipe-iterationIngo Molnar2008-05-231-15/+5Star
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: remove-idx-syncIngo Molnar2008-05-232-37/+5Star
| | | | | | | remove idx syncing - it's expensive on SMP. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: fast, scalable, synchronized timestampsIngo Molnar2008-05-231-1/+53
| | | | | | | implement globally synchronized, fast and scalable time source for tracing. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: timestamp syncing, prepareIngo Molnar2008-05-237-14/+16
| | | | | | | rename and uninline now() to ftrace_now(). Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: cleanupsIngo Molnar2008-05-232-38/+39
| | | | | | | no code changed. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: fix lockingIngo Molnar2008-05-232-5/+4Star
| | | | | | | | we can hold all cpu trace buffer locks at once - put each into a separate lock class. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: user run time file readingSteven Rostedt2008-05-232-46/+309
| | | | | | | | | | | | | | | | | | | | This patch creates a file called trace_pipe in the tracing debug directory. This file is a consumer of the trace buffers. This means that reads of this file consumes the entries from the trace buffers so that they will not be read a second time, as contrast to the static buffers latency_trace and trace. Reading from the trace_pipe will remove the entries from trace and latency_trace too. The advantage that trace_pipe has is that it can record live traces. It will block when there is nothing in the buffer, and read the entries as they are entered. An EOF happens when tracing is disabled (tracing_enabled = 0). Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add a buffer for outputSteven Rostedt2008-05-232-68/+140
| | | | | | | | | | | Later patches will need to print the same things as the seq output does. But those outputs will not use the seq utility. This patch adds a buffer to the iterator, that can be used by either the seq utility or other output. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: change buffers to producer consumerSteven Rostedt2008-05-232-44/+65
| | | | | | | | | | | This patch changes the way the CPU trace buffers are handled. Instead of always starting from the trace page head, the logic is changed to a producer consumer logic. This allows for the buffers to be drained while they are alive. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: reset selftestsSteven Rostedt2008-05-231-0/+7
| | | | | | | | | | The tests may leave stuff in the buffers. This resets the buffers after each test is run. If a test fails, it does not reset the buffer to avoid touching a buffer that is corrupted. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: disable all tracers on corrupted bufferSteven Rostedt2008-05-231-0/+2
| | | | | | | | | If the trace buffer is detected to be corrupted, then we disable all tracers. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: fix time offsetIngo Molnar2008-05-232-21/+63
| | | | | | | fix time offset calculations and ordering, plus make code more consistent. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: startup tester on dynamic tracing.Steven Rostedt2008-05-232-4/+128
| | | | | | | | | | | | | | This patch adds a startup self test on dynamic code modification and filters. The test filters on a specific function, makes sure that no other function is traced, exectutes the function, then makes sure that the function is traced. This patch also fixes a slight bug with the ftrace selftest, where tracer_enabled was not being set. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: add READMEIngo Molnar2008-05-231-1/+39
| | | | | | | make it easier for newbies to find their way around. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* ftrace: cleanupsIngo Molnar2008-05-236-102/+133
| | | | | | | factor out code and clean it up. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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