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