76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
// 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();
|
|
}
|