/*
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* Copyright (c) 2018 Google, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* This test looks for a high number of wakeups from the schedutil governor
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* threads.
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*/
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#define _GNU_SOURCE
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#include <errno.h>
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#include <pthread.h>
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#include <sched.h>
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#include <stdio.h>
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#include <time.h>
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#include "tst_test.h"
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#include "tst_safe_file_ops.h"
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#include "tst_safe_pthread.h"
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#include "trace_parse.h"
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#define TRACE_EVENTS "sched_switch"
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#define MAX_WAKEUPS 100
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#define SLEEP_SEC 10
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static void run(void)
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{
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int i;
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int num_sugov_wakeups = 0;
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tst_res(TINFO, "Observing sugov wakeups over %d sec, "
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"%d wakeups allowed\n", SLEEP_SEC, MAX_WAKEUPS);
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/* configure and enable tracing */
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SAFE_FILE_PRINTF(TRACING_DIR "tracing_on", "0");
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SAFE_FILE_PRINTF(TRACING_DIR "buffer_size_kb", "16384");
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SAFE_FILE_PRINTF(TRACING_DIR "set_event", TRACE_EVENTS);
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SAFE_FILE_PRINTF(TRACING_DIR "trace", "\n");
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SAFE_FILE_PRINTF(TRACING_DIR "tracing_on", "1");
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sleep(SLEEP_SEC);
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/* disable tracing */
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SAFE_FILE_PRINTF(TRACING_DIR "tracing_on", "0");
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LOAD_TRACE();
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for (i = 0; i < num_trace_records; i++) {
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if (trace[i].event_type == TRACE_RECORD_SCHED_SWITCH) {
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struct trace_sched_switch *t = trace[i].event_data;
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if (!strncmp("sugov:", t->next_comm, 6))
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num_sugov_wakeups++;
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}
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}
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printf("%d sugov wakeups occurred.\n", num_sugov_wakeups);
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if (num_sugov_wakeups > MAX_WAKEUPS)
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tst_res(TFAIL, "Too many wakeups from the schedutil "
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"governor.\n");
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else
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tst_res(TPASS, "Wakeups from schedutil governor were below "
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"threshold.\n");
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}
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static struct tst_test test = {
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.test_all = run,
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.cleanup = trace_cleanup,
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};
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