Commit b7b037eb authored by Steven Rostedt (Google)'s avatar Steven Rostedt (Google)
Browse files

tracing: Add numeric delta time to the trace event benchmark 

In order to testing filtering and histograms via the trace event
benchmark, record the delta time of the last event as a numeric value
(currently, it just saves it within the string) so that filters and
histograms can use it.

Link: https://lkml.kernel.org/r/20220906225529.213677569@goodmis.org



Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 4359a011

kernel/trace/trace_benchmark.c

+1 −1
Original line number Diff line number Diff line
@@ -51,7 +51,7 @@ static void trace_do_benchmark(void) 


	local_irq_disable();

	start = trace_clock_local();

	trace_benchmark_event(bm_str);

	trace_benchmark_event(bm_str, bm_last);

	stop = trace_clock_local();

	local_irq_enable();

kernel/trace/trace_benchmark.h

+5 −3
Original line number Diff line number Diff line
@@ -14,19 +14,21 @@ extern void trace_benchmark_unreg(void); 


TRACE_EVENT_FN(benchmark_event,



	TP_PROTO(const char *str),

	TP_PROTO(const char *str, u64 delta),



	TP_ARGS(str),

	TP_ARGS(str, delta),



	TP_STRUCT__entry(

		__array(	char,	str,	BENCHMARK_EVENT_STRLEN	)

		__field(	u64,	delta)

	),



	TP_fast_assign(

		memcpy(__entry->str, str, BENCHMARK_EVENT_STRLEN);

		__entry->delta = delta;

	),



	TP_printk("%s", __entry->str),

	TP_printk("%s delta=%llu", __entry->str, __entry->delta),



	trace_benchmark_reg, trace_benchmark_unreg

);