forked from Minki/linux
selftests/timers: Add inconsistency-check test from timetests
This adds my inconsistency-test from my timetests suite, which checks for (single threaded) time inconsistencies across the various clockids. Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Richard Cochran <richardcochran@gmail.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Tested-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
John Stultz
Shuah Khan
parent
689f32fbb8
commit
ed3fe34a2a
@ -2,13 +2,13 @@ CC = $(CROSS_COMPILE)gcc
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BUILD_FLAGS = -DKTEST
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CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
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LDFLAGS += -lrt -lpthread
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bins = posix_timers nanosleep
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bins = posix_timers nanosleep inconsistency-check
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all: ${bins}
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run_tests: all
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./posix_timers
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./nanosleep
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./inconsistency-check
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clean:
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rm -f ${bins}
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204
tools/testing/selftests/timers/inconsistency-check.c
Normal file
204
tools/testing/selftests/timers/inconsistency-check.c
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@ -0,0 +1,204 @@
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/* 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 = 0;
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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) {
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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 = 30;
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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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