linux-kernel - [PATCH v2 1/4] tracing: Add numeric delta time to the trace event benchmark

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Message-ID: <20220906225529.213677569@goodmis.org>
Date:   Tue, 06 Sep 2022 18:53:14 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>
Subject: [PATCH v2 1/4] tracing: Add numeric delta time to the trace event benchmark

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

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.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_benchmark.c | 2 +-
 kernel/trace/trace_benchmark.h | 8 +++++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_benchmark.c b/kernel/trace/trace_benchmark.c
index 801c2a7f7605..54d5fa35c90a 100644
--- 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
index 79e6fbe5b365..c3e91060dc94 100644
--- 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
 );
-- 
2.35.1