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ftrace: add nop tracer

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A no-op tracer which can serve two purposes:

 1. A template for development of a new tracer.
 2. A convenient way to see ftrace_printk() calls without
    an irrelevant trace making the output messy.

[ mingo@elte.hu: resolved conflicts ]
Signed-off-by: Steven Noonan <steven@uplinklabs.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Noonan
2008-09-19 03:06:43 -07:00
committed by Ingo Molnar
parent 5bf9a1ee35
commit fb1b6d8b51
5 changed files with 89 additions and 0 deletions
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4
kernel/trace/trace.h
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@@ -339,6 +339,10 @@ extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
extern int trace_selftest_startup_wakeup(struct tracer *trace,
struct trace_array *tr);
#endif
#ifdef CONFIG_NOP_TRACER
extern int trace_selftest_startup_nop(struct tracer *trace,
struct trace_array *tr);
#endif
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
extern int trace_selftest_startup_sched_switch(struct tracer *trace,
struct trace_array *tr);