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authorSteven Rostedt <srostedt@redhat.com>2008-11-05 16:05:44 -0500
committerIngo Molnar <mingo@elte.hu>2008-11-06 01:50:51 -0500
commit60a7ecf42661f2b22168751298592da6ee210c9e (patch)
tree050fd052c546c92f8aac10ee71d5bb6d98a21fc8 /kernel/trace/Kconfig
parent79c81d220c8e25163f56edcdfaf23f83a4c88e6b (diff)
ftrace: add quick function trace stop
Impact: quick start and stop of function tracer This patch adds a way to disable the function tracer quickly without the need to run kstop_machine. It adds a new variable called function_trace_stop which will stop the calls to functions from mcount when set. This is just an on/off switch and does not handle recursion like preempt_disable(). It's main purpose is to help other tracers/debuggers start and stop tracing fuctions without the need to call kstop_machine. The config option HAVE_FUNCTION_TRACE_MCOUNT_TEST is added for archs that implement the testing of the function_trace_stop in the mcount arch dependent code. Otherwise, the test is done in the C code. x86 is the only arch at the moment that supports this. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/Kconfig')
-rw-r--r--kernel/trace/Kconfig7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 33dbefd471e8..fc4febc3334a 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -9,6 +9,13 @@ config NOP_TRACER
9config HAVE_FUNCTION_TRACER 9config HAVE_FUNCTION_TRACER
10 bool 10 bool
11 11
12config HAVE_FUNCTION_TRACE_MCOUNT_TEST
13 bool
14 help
15 This gets selected when the arch tests the function_trace_stop
16 variable at the mcount call site. Otherwise, this variable
17 is tested by the called function.
18
12config HAVE_DYNAMIC_FTRACE 19config HAVE_DYNAMIC_FTRACE
13 bool 20 bool
14 21