linux/kernel/trace/trace_benchmark.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/trace_clock.h>

#define CREATE_TRACE_POINTS
#include "trace_benchmark.h"

static struct task_struct *bm_event_thread;

static char bm_str[BENCHMARK_EVENT_STRLEN] = …;

static u64 bm_total;
static u64 bm_totalsq;
static u64 bm_last;
static u64 bm_max;
static u64 bm_min;
static u64 bm_first;
static u64 bm_cnt;
static u64 bm_stddev;
static unsigned int bm_avg;
static unsigned int bm_std;

static bool ok_to_run;

/*
 * This gets called in a loop recording the time it took to write
 * the tracepoint. What it writes is the time statistics of the last
 * tracepoint write. As there is nothing to write the first time
 * it simply writes "START". As the first write is cold cache and
 * the rest is hot, we save off that time in bm_first and it is
 * reported as "first", which is shown in the second write to the
 * tracepoint. The "first" field is written within the statics from
 * then on but never changes.
 */
static void trace_do_benchmark(void)
{ … }

static int benchmark_event_kthread(void *arg)
{ … }

/*
 * When the benchmark tracepoint is enabled, it calls this
 * function and the thread that calls the tracepoint is created.
 */
int trace_benchmark_reg(void)
{ … }

/*
 * When the benchmark tracepoint is disabled, it calls this
 * function and the thread that calls the tracepoint is deleted
 * and all the numbers are reset.
 */
void trace_benchmark_unreg(void)
{ … }

static __init int ok_to_run_trace_benchmark(void)
{ … }

early_initcall(ok_to_run_trace_benchmark);