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![Ian Rogers](/assets/img/avatar_default.png)
Add a benchmark for kallsyms parsing. Example output: Running 'internals/kallsyms-parse' benchmark: Average kallsyms__parse took: 103.971 ms (+- 0.121 ms) Committer testing: Test Machine: AMD Ryzen 5 3600X 6-Core Processor [root@five ~]# perf bench internals kallsyms-parse # Running 'internals/kallsyms-parse' benchmark: Average kallsyms__parse took: 79.692 ms (+- 0.101 ms) [root@five ~]# perf stat -r5 perf bench internals kallsyms-parse # Running 'internals/kallsyms-parse' benchmark: Average kallsyms__parse took: 80.563 ms (+- 0.079 ms) # Running 'internals/kallsyms-parse' benchmark: Average kallsyms__parse took: 81.046 ms (+- 0.155 ms) # Running 'internals/kallsyms-parse' benchmark: Average kallsyms__parse took: 80.874 ms (+- 0.104 ms) # Running 'internals/kallsyms-parse' benchmark: Average kallsyms__parse took: 81.173 ms (+- 0.133 ms) # Running 'internals/kallsyms-parse' benchmark: Average kallsyms__parse took: 81.169 ms (+- 0.074 ms) Performance counter stats for 'perf bench internals kallsyms-parse' (5 runs): 8,093.54 msec task-clock # 0.999 CPUs utilized ( +- 0.14% ) 3,165 context-switches # 0.391 K/sec ( +- 0.18% ) 10 cpu-migrations # 0.001 K/sec ( +- 23.13% ) 744 page-faults # 0.092 K/sec ( +- 0.21% ) 34,551,564,954 cycles # 4.269 GHz ( +- 0.05% ) (83.33%) 1,160,584,308 stalled-cycles-frontend # 3.36% frontend cycles idle ( +- 1.60% ) (83.33%) 14,974,323,985 stalled-cycles-backend # 43.34% backend cycles idle ( +- 0.24% ) (83.33%) 58,712,905,705 instructions # 1.70 insn per cycle # 0.26 stalled cycles per insn ( +- 0.01% ) (83.34%) 14,136,433,778 branches # 1746.632 M/sec ( +- 0.01% ) (83.33%) 141,943,217 branch-misses # 1.00% of all branches ( +- 0.04% ) (83.33%) 8.1040 +- 0.0115 seconds time elapsed ( +- 0.14% ) [root@five ~]# Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lore.kernel.org/lkml/20200501221315.54715-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
// 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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