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tracing: Prevent wasting time evaluating parameters in trace_preempt_on/off

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This fixes spending time for evaluating parameters in trace_preempt_on/off when
the tracer config is off.

The patch mainly inspired by Steven Rostedt, thanks Steven.

Link: http://lkml.kernel.org/r/4FA73510.7070705@samsung.com

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Turner <pjt@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Minho Ban <mhban@samsung.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Minho Ban 2012-05-07 11:36:00 +09:00 committed by Steven Rostedt
parent 19631cb3d6
commit b02ee9a33b
1 changed files with 6 additions and 2 deletions
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8
include/linux/ftrace.h
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@ -491,8 +491,12 @@ static inline void __ftrace_enabled_restore(int enabled)
extern void trace_preempt_on(unsigned long a0, unsigned long a1); extern void trace_preempt_on(unsigned long a0, unsigned long a1);
extern void trace_preempt_off(unsigned long a0, unsigned long a1); extern void trace_preempt_off(unsigned long a0, unsigned long a1);
#else #else
static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { } /*
static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { } * Use defines instead of static inlines because some arches will make code out
* of the CALLER_ADDR, when we really want these to be a real nop.
*/
# define trace_preempt_on(a0, a1) do { } while (0)
# define trace_preempt_off(a0, a1) do { } while (0)
#endif #endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD #ifdef CONFIG_FTRACE_MCOUNT_RECORD