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tracing/function-graph-tracer: provide a selftest for the function gr…
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…aph tracer

Making it more easy to do a basic regression test for this tracer.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Frederic Weisbecker authored and Ingo Molnar committed Feb 9, 2009
1 parent 2db270a commit 7447dce
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Showing 3 changed files with 55 additions and 0 deletions.
2 changes: 2 additions & 0 deletions kernel/trace/trace.h
Original file line number Diff line number Diff line change
Expand Up @@ -500,6 +500,8 @@ extern int DYN_FTRACE_TEST_NAME(void);
#ifdef CONFIG_FTRACE_STARTUP_TEST
extern int trace_selftest_startup_function(struct tracer *trace,
struct trace_array *tr);
extern int trace_selftest_startup_function_graph(struct tracer *trace,
struct trace_array *tr);
extern int trace_selftest_startup_irqsoff(struct tracer *trace,
struct trace_array *tr);
extern int trace_selftest_startup_preemptoff(struct tracer *trace,
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3 changes: 3 additions & 0 deletions kernel/trace/trace_functions_graph.c
Original file line number Diff line number Diff line change
Expand Up @@ -750,6 +750,9 @@ static struct tracer graph_trace __read_mostly = {
.print_line = print_graph_function,
.print_header = print_graph_headers,
.flags = &tracer_flags,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_function_graph,
#endif
};

static __init int init_graph_trace(void)
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50 changes: 50 additions & 0 deletions kernel/trace/trace_selftest.c
Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,8 @@ static inline int trace_valid_entry(struct trace_entry *entry)
case TRACE_PRINT:
case TRACE_SPECIAL:
case TRACE_BRANCH:
case TRACE_GRAPH_ENT:
case TRACE_GRAPH_RET:
return 1;
}
return 0;
Expand Down Expand Up @@ -227,6 +229,54 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
}
#endif /* CONFIG_FUNCTION_TRACER */


#ifdef CONFIG_FUNCTION_GRAPH_TRACER
/*
* Pretty much the same than for the function tracer from which the selftest
* has been borrowed.
*/
int
trace_selftest_startup_function_graph(struct tracer *trace,
struct trace_array *tr)
{
int ret;
unsigned long count;

ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
goto out;
}

/* Sleep for a 1/10 of a second */
msleep(100);

tracing_stop();

/* check the trace buffer */
ret = trace_test_buffer(tr, &count);

trace->reset(tr);
tracing_start();

if (!ret && !count) {
printk(KERN_CONT ".. no entries found ..");
ret = -1;
goto out;
}

/* Don't test dynamic tracing, the function tracer already did */

out:
/* Stop it if we failed */
if (ret)
ftrace_graph_stop();

return ret;
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */


#ifdef CONFIG_IRQSOFF_TRACER
int
trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
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