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// SPDX-License-Identifier: GPL-2.0
/*
* Benchmark synthesis of perf events such as at the start of a 'perf
* record'. Synthesis is done on the current process and the 'dummy' event
* handlers are invoked that support dump_trace but otherwise do nothing.
*
* Copyright 2019 Google LLC.
*/
#include <stdio.h>
#include "bench.h"
#include "../util/debug.h"
#include "../util/session.h"
#include "../util/synthetic-events.h"
#include "../util/target.h"
#include "../util/thread_map.h"
#include "../util/tool.h"
#include <linux/err.h>
#include <linux/time64.h>
#include <subcmd/parse-options.h>
static unsigned int iterations = 10000;
static const struct option options[] = {
OPT_UINTEGER('i', "iterations", &iterations,
"Number of iterations used to compute average"),
OPT_END()
};
static const char *const usage[] = {
"perf bench internals synthesize <options>",
NULL
};
static int do_synthesize(struct perf_session *session,
struct perf_thread_map *threads,
struct target *target, bool data_mmap)
{
const unsigned int nr_threads_synthesize = 1;
struct timeval start, end, diff;
u64 runtime_us;
unsigned int i;
double average;
int err;
gettimeofday(&start, NULL);
for (i = 0; i < iterations; i++) {
err = machine__synthesize_threads(&session->machines.host,
target, threads, data_mmap,
nr_threads_synthesize);
if (err)
return err;
}
gettimeofday(&end, NULL);
timersub(&end, &start, &diff);
runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec;
average = (double)runtime_us/(double)iterations;
printf("Average %ssynthesis took: %f usec\n",
data_mmap ? "data " : "", average);
return 0;
}
int bench_synthesize(int argc, const char **argv)
{
struct perf_tool tool;
struct perf_session *session;
struct target target = {
.pid = "self",
};
struct perf_thread_map *threads;
int err;
argc = parse_options(argc, argv, options, usage, 0);
session = perf_session__new(NULL, false, NULL);
if (IS_ERR(session)) {
pr_err("Session creation failed.\n");
return PTR_ERR(session);
}
threads = thread_map__new_by_pid(getpid());
if (!threads) {
pr_err("Thread map creation failed.\n");
err = -ENOMEM;
goto err_out;
}
perf_tool__fill_defaults(&tool);
err = do_synthesize(session, threads, &target, false);
if (err)
goto err_out;
err = do_synthesize(session, threads, &target, true);
err_out:
if (threads)
perf_thread_map__put(threads);
perf_session__delete(session);
return err;
}
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