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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-03-14 12:10:40 -0400
committerSteven Rostedt <rostedt@goodmis.org>2013-03-15 00:36:08 -0400
commit328df4759c03e2c3e7429cc6cb0e180c38f32063 (patch)
tree874c0aa7642cfe8ce1e4512464eae1d33e99391b /kernel/trace/trace.h
parent4df297129f622bdc18935c856f42b9ddd18f9f28 (diff)
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tracing: Add function-trace option to disable function tracing of latency tracers
Currently, the only way to stop the latency tracers from doing function tracing is to fully disable the function tracer from the proc file system: echo 0 > /proc/sys/kernel/ftrace_enabled This is a big hammer approach as it disables function tracing for all users. This includes kprobes, perf, stack tracer, etc. Instead, create a function-trace option that the latency tracers can check to determine if it should enable function tracing or not. This option can be set or cleared even while the tracer is active and the tracers will disable or enable function tracing depending on how the option was set. Instead of using the proc file, disable latency function tracing with echo 0 > /debug/tracing/options/function-trace Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
-rw-r--r--kernel/trace/trace.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 0e430b4..5cc5236 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -867,6 +867,7 @@ enum trace_iterator_flags {
TRACE_ITER_STOP_ON_FREE = 0x400000,
TRACE_ITER_IRQ_INFO = 0x800000,
TRACE_ITER_MARKERS = 0x1000000,
+ TRACE_ITER_FUNCTION = 0x2000000,
};
/*