- 23 May, 2008 40 commits
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Steven Rostedt authored
There is a slight race condition in the selftest where the max update of the wakeup and irqs/preemption off tests can be doing a max update as the buffers are being tested. If this happens the system can crash with a GPF. This patch adds the max update spinlock around the checking of the buffers to prevent such a race. Signed-off-by:
Steven Rostedt <srostedt@redhat.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de>
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Steven Rostedt authored
If the trace output changes on reading the trace files, there is a chance that the start function will return NULL. If the start function of a sequence returns NULL the stop equivalent is not called. In this case, all locks that are taken must be released even if they are released in the stop function. This patch fixes a case that a mutex was not released on return of NULL in the start sequence function. Signed-off-by:
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Steven Rostedt authored
When dynamic ftrace fails and sets itself disabled, the ftraced daemon will go back to sleep everytime it wakes up. The setting of the ftraced state to UNINTERRUPTIBLE is skipped in this process, and the daemon takes up 100% of the CPU. This patch makes sure the ftraced daemon sets itself to UNINTERRUPTIBLE in that loop. Signed-off-by:
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Ingo Molnar authored
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Steven Rostedt authored
This patch removes the "notrace" annotation from lockdep and adds the debugging files in the kernel director to those that should not be compiled with "-pg" mcount tracing. Signed-off-by:
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Steven Rostedt authored
The debug functions in spin_lock debugging pollute the output of the function tracer. This patch adds the debug files in the lib director to those that should not be compiled with mcount tracing. Signed-off-by:
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Steven Rostedt authored
Lock debugging enabled cause huge performance problems for tracing. Having the lock verification happening for every function that is called because mcount calls spin_lock can cripple the system. This patch converts the spin_locks used by ftrace into raw_spin_locks. Signed-off-by:
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Steven Rostedt authored
This patch changes the use of __get_cpu_var to explicitly calling raw_smp_processor_id and using the per_cpu() macro. On some debug configurations, the use of __get_cpu_var may cause ftrace to trigger and this can cause problems with the irqsoff tracing. Signed-off-by:
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Ingo Molnar authored
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Steven Rostedt authored
With the adding of the configuration changes in the Makefile to prevent tracing of functions in the ftrace code, all tracing of all the ftrace code has been removed. Unfortunately, one of the selftests, relied on a function to be traced. With the new change, the function was no longer traced and the test failed. This patch separates out the test function into its own file so that we can add the "-pg" flag to the compilation of that function and the adding of the mcount call to that function. Signed-off-by:
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Steven Rostedt authored
The selftest validation code checks for valid entries in the trace buffer. TRACE_STACK and TRACE_SPECIAL have been added to the code but not to the validator. This patch adds the two to prevent them from flagging a failure in the selftest. Signed-off-by:
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Steven Rostedt authored
printk called from wakeup critical timings and irqs off can cause deadlocks since printk might do a wakeup itself. If the call to printk happens with the runqueue lock held, it can deadlock. This patch protects the printk from being called in trace irqs off with a test to see if the runqueue for the current CPU is locked. If it is locked, the printk is skipped. The wakeup always holds the runqueue lock, so the printk is simply removed. Signed-off-by:
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Steven Rostedt authored
trace_function is called by mcount and calling wake_up from that can have unpredictable results. This patch removes the wakeup from trace_function. Signed-off-by:
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Ingo Molnar authored
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Peter Zijlstra authored
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Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by:
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Peter Zijlstra authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
now that we have a kbuild method for notrace, no need to pollute the C code with the annotations. Signed-off-by:
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Ingo Molnar authored
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Steven Rostedt authored
Most archs define the string and memory compare functions in assembly. Some do not. But these functions may be used in some archs at early boot up. Since most archs define this code in assembly and they are not usually traced, there's no need to trace them when they are not defined in assembly. This patch removes the -pg from the CFLAGS for lib/string.o. This prevents the string functions use in either vdso or early bootup from crashing the system. Signed-off-by:
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Steven Rostedt authored
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:
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Ingo Molnar authored
clean up recent code. Signed-off-by:
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Steven Rostedt authored
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:
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Soeren Sandmann Pedersen authored
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Ingo Molnar authored
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