[for-next][PATCH 05/20] tracing: Add numeric delta time to the trace event benchmark

From: Steven Rostedt
Date: Tue Sep 27 2022 - 12:02:21 EST


From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>

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@xxxxxxxxxxx

Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Tom Zanussi <zanussi@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
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