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/[email protected] Cc: Ingo Molnar <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Masami Hiramatsu <[email protected]> Cc: Tom Zanussi <[email protected]> Signed-off-by: Steven Rostedt (Google) <[email protected]>
majek · Sep 26, 2022 · b7b037e · b7b037e
1 parent 4359a01
commit b7b037e
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Showing 2 changed files with 6 additions and 4 deletions.
diff --git a/kernel/trace/trace_benchmark.c b/kernel/trace/trace_benchmark.c
@@ -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();
 

diff --git a/kernel/trace/trace_benchmark.h b/kernel/trace/trace_benchmark.h
@@ -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
 );