Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Benchmark of /proc/kallsyms parsing.
 *
 * Copyright 2020 Google LLC.
 */
#include <stdlib.h>
#include "bench.h"
#include "../util/stat.h"
#include <linux/time64.h>
#include <subcmd/parse-options.h>
#include <symbol/kallsyms.h>
 
static unsigned int iterations = 100;
 
static const struct option options[] = {
<------>OPT_UINTEGER('i', "iterations", &iterations,
<------><------>"Number of iterations used to compute average"),
<------>OPT_END()
};
 
static const char *const bench_usage[] = {
<------>"perf bench internals kallsyms-parse <options>",
<------>NULL
};
 
static int bench_process_symbol(void *arg __maybe_unused,
<------><------><------><------>const char *name __maybe_unused,
<------><------><------><------>char type __maybe_unused,
<------><------><------><------>u64 start __maybe_unused)
{
<------>return 0;
}
 
static int do_kallsyms_parse(void)
{
<------>struct timeval start, end, diff;
<------>u64 runtime_us;
<------>unsigned int i;
<------>double time_average, time_stddev;
<------>int err;
<------>struct stats time_stats;
 
<------>init_stats(&time_stats);
 
<------>for (i = 0; i < iterations; i++) {
<------><------>gettimeofday(&start, NULL);
<------><------>err = kallsyms__parse("/proc/kallsyms", NULL,
<------><------><------><------>bench_process_symbol);
<------><------>if (err)
<------><------><------>return err;
 
<------><------>gettimeofday(&end, NULL);
<------><------>timersub(&end, &start, &diff);
<------><------>runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec;
<------><------>update_stats(&time_stats, runtime_us);
<------>}
 
<------>time_average = avg_stats(&time_stats) / USEC_PER_MSEC;
<------>time_stddev = stddev_stats(&time_stats) / USEC_PER_MSEC;
<------>printf("  Average kallsyms__parse took: %.3f ms (+- %.3f ms)\n",
<------><------>time_average, time_stddev);
<------>return 0;
}
 
int bench_kallsyms_parse(int argc, const char **argv)
{
<------>argc = parse_options(argc, argv, options, bench_usage, 0);
<------>if (argc) {
<------><------>usage_with_options(bench_usage, options);
<------><------>exit(EXIT_FAILURE);
<------>}
 
<------>return do_kallsyms_parse();
}