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tracing: Add numeric delta time to the trace event benchmark

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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: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Google) 2022-09-06 18:53:14 -04:00
parent 4359a011e2
commit b7b037eb5f
2 changed files with 6 additions and 4 deletions
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2
kernel/trace/trace_benchmark.c
View file

@ -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();

8
kernel/trace/trace_benchmark.h
View file

@ -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
);