![Miroslav Lichvar](/assets/img/avatar_default.png)
When the first timestamp in the list of clock readings was later than the second timestamp and all other timestamps were in order, the inconsistency was not reported because the index of the out-of-order timestamp was equal to the default value. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Miroslav Lichvar <mlichvar@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Stephen Boyd <stephen.boyd@linaro.org> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
205 lines
4.9 KiB
C
205 lines
4.9 KiB
C
/* Time inconsistency check test
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* by: john stultz (johnstul@us.ibm.com)
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* (C) Copyright IBM 2003, 2004, 2005, 2012
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* (C) Copyright Linaro Limited 2015
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* Licensed under the GPLv2
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*
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* To build:
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* $ gcc inconsistency-check.c -o inconsistency-check -lrt
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/timex.h>
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#include <string.h>
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#include <signal.h>
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#ifdef KTEST
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#include "../kselftest.h"
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#else
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static inline int ksft_exit_pass(void)
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{
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exit(0);
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}
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static inline int ksft_exit_fail(void)
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{
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exit(1);
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}
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#endif
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#define CALLS_PER_LOOP 64
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#define NSEC_PER_SEC 1000000000ULL
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#define CLOCK_REALTIME 0
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#define CLOCK_MONOTONIC 1
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#define CLOCK_PROCESS_CPUTIME_ID 2
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#define CLOCK_THREAD_CPUTIME_ID 3
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#define CLOCK_MONOTONIC_RAW 4
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#define CLOCK_REALTIME_COARSE 5
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#define CLOCK_MONOTONIC_COARSE 6
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#define CLOCK_BOOTTIME 7
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#define CLOCK_REALTIME_ALARM 8
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#define CLOCK_BOOTTIME_ALARM 9
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#define CLOCK_HWSPECIFIC 10
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#define CLOCK_TAI 11
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#define NR_CLOCKIDS 12
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char *clockstring(int clockid)
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{
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switch (clockid) {
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case CLOCK_REALTIME:
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return "CLOCK_REALTIME";
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case CLOCK_MONOTONIC:
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return "CLOCK_MONOTONIC";
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case CLOCK_PROCESS_CPUTIME_ID:
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return "CLOCK_PROCESS_CPUTIME_ID";
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case CLOCK_THREAD_CPUTIME_ID:
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return "CLOCK_THREAD_CPUTIME_ID";
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case CLOCK_MONOTONIC_RAW:
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return "CLOCK_MONOTONIC_RAW";
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case CLOCK_REALTIME_COARSE:
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return "CLOCK_REALTIME_COARSE";
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case CLOCK_MONOTONIC_COARSE:
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return "CLOCK_MONOTONIC_COARSE";
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case CLOCK_BOOTTIME:
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return "CLOCK_BOOTTIME";
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case CLOCK_REALTIME_ALARM:
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return "CLOCK_REALTIME_ALARM";
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case CLOCK_BOOTTIME_ALARM:
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return "CLOCK_BOOTTIME_ALARM";
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case CLOCK_TAI:
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return "CLOCK_TAI";
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};
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return "UNKNOWN_CLOCKID";
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}
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/* returns 1 if a <= b, 0 otherwise */
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static inline int in_order(struct timespec a, struct timespec b)
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{
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/* use unsigned to avoid false positives on 2038 rollover */
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if ((unsigned long)a.tv_sec < (unsigned long)b.tv_sec)
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return 1;
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if ((unsigned long)a.tv_sec > (unsigned long)b.tv_sec)
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return 0;
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if (a.tv_nsec > b.tv_nsec)
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return 0;
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return 1;
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}
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int consistency_test(int clock_type, unsigned long seconds)
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{
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struct timespec list[CALLS_PER_LOOP];
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int i, inconsistent;
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long now, then;
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time_t t;
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char *start_str;
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clock_gettime(clock_type, &list[0]);
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now = then = list[0].tv_sec;
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/* timestamp start of test */
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t = time(0);
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start_str = ctime(&t);
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while (seconds == -1 || now - then < seconds) {
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inconsistent = -1;
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/* Fill list */
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for (i = 0; i < CALLS_PER_LOOP; i++)
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clock_gettime(clock_type, &list[i]);
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/* Check for inconsistencies */
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for (i = 0; i < CALLS_PER_LOOP - 1; i++)
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if (!in_order(list[i], list[i+1]))
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inconsistent = i;
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/* display inconsistency */
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if (inconsistent >= 0) {
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unsigned long long delta;
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printf("\%s\n", start_str);
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for (i = 0; i < CALLS_PER_LOOP; i++) {
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if (i == inconsistent)
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printf("--------------------\n");
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printf("%lu:%lu\n", list[i].tv_sec,
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list[i].tv_nsec);
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if (i == inconsistent + 1)
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printf("--------------------\n");
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}
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delta = list[inconsistent].tv_sec * NSEC_PER_SEC;
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delta += list[inconsistent].tv_nsec;
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delta -= list[inconsistent+1].tv_sec * NSEC_PER_SEC;
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delta -= list[inconsistent+1].tv_nsec;
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printf("Delta: %llu ns\n", delta);
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fflush(0);
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/* timestamp inconsistency*/
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t = time(0);
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printf("%s\n", ctime(&t));
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printf("[FAILED]\n");
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return -1;
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}
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now = list[0].tv_sec;
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}
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printf("[OK]\n");
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int clockid, opt;
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int userclock = CLOCK_REALTIME;
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int maxclocks = NR_CLOCKIDS;
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int runtime = 10;
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struct timespec ts;
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/* Process arguments */
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while ((opt = getopt(argc, argv, "t:c:")) != -1) {
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switch (opt) {
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case 't':
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runtime = atoi(optarg);
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break;
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case 'c':
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userclock = atoi(optarg);
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maxclocks = userclock + 1;
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break;
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default:
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printf("Usage: %s [-t <secs>] [-c <clockid>]\n", argv[0]);
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printf(" -t: Number of seconds to run\n");
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printf(" -c: clockid to use (default, all clockids)\n");
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exit(-1);
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}
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}
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setbuf(stdout, NULL);
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for (clockid = userclock; clockid < maxclocks; clockid++) {
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if (clockid == CLOCK_HWSPECIFIC)
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continue;
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if (!clock_gettime(clockid, &ts)) {
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printf("Consistent %-30s ", clockstring(clockid));
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if (consistency_test(clockid, runtime))
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return ksft_exit_fail();
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}
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}
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return ksft_exit_pass();
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}
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