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    Subject[PATCH 04/19] selftests/timers: Add inconsistency-check test from timetests
    Date
    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>
    ---
    tools/testing/selftests/timers/Makefile | 4 +-
    .../testing/selftests/timers/inconsistency-check.c | 207 +++++++++++++++++++++
    2 files changed, 209 insertions(+), 2 deletions(-)
    create mode 100644 tools/testing/selftests/timers/inconsistency-check.c

    diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
    index 9409423..fcb7c2f 100644
    --- a/tools/testing/selftests/timers/Makefile
    +++ b/tools/testing/selftests/timers/Makefile
    @@ -2,13 +2,13 @@ CC = $(CROSS_COMPILE)gcc
    BUILD_FLAGS = -DKTEST
    CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
    LDFLAGS += -lrt -lpthread
    -bins = posix_timers nanosleep
    +bins = posix_timers nanosleep inconsistency-check

    all: ${bins}

    run_tests: all
    ./posix_timers
    ./nanosleep
    -
    + ./inconsistency-check
    clean:
    rm -f ${bins}
    diff --git a/tools/testing/selftests/timers/inconsistency-check.c b/tools/testing/selftests/timers/inconsistency-check.c
    new file mode 100644
    index 0000000..04c63b9
    --- /dev/null
    +++ b/tools/testing/selftests/timers/inconsistency-check.c
    @@ -0,0 +1,207 @@
    +/* Time inconsistency check test
    + * by: john stultz (johnstul@us.ibm.com)
    + * (C) Copyright IBM 2003, 2004, 2005, 2012
    + * (C) Copyright Linaro Limited 2015
    + * Licensed under the GPLv2
    + *
    + * To build:
    + * $ gcc inconsistency-check.c -o inconsistency-check -lrt
    + *
    + * This program is free software: you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation, either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + */
    +
    +
    +
    +#include <stdio.h>
    +#include <unistd.h>
    +#include <stdlib.h>
    +#include <time.h>
    +#include <sys/time.h>
    +#include <sys/timex.h>
    +#include <string.h>
    +#include <signal.h>
    +#ifdef KTEST
    +#include "../kselftest.h"
    +#else
    +static inline int ksft_exit_pass(void)
    +{
    + exit(0);
    +}
    +static inline int ksft_exit_fail(void)
    +{
    + exit(1);
    +}
    +#endif
    +
    +extern char *optarg;
    +
    +
    +#define CALLS_PER_LOOP 64
    +#define NSEC_PER_SEC 1000000000ULL
    +
    +#define CLOCK_REALTIME 0
    +#define CLOCK_MONOTONIC 1
    +#define CLOCK_PROCESS_CPUTIME_ID 2
    +#define CLOCK_THREAD_CPUTIME_ID 3
    +#define CLOCK_MONOTONIC_RAW 4
    +#define CLOCK_REALTIME_COARSE 5
    +#define CLOCK_MONOTONIC_COARSE 6
    +#define CLOCK_BOOTTIME 7
    +#define CLOCK_REALTIME_ALARM 8
    +#define CLOCK_BOOTTIME_ALARM 9
    +#define CLOCK_HWSPECIFIC 10
    +#define CLOCK_TAI 11
    +#define NR_CLOCKIDS 12
    +
    +char *clockstring(int clockid)
    +{
    + switch (clockid) {
    + case CLOCK_REALTIME:
    + return "CLOCK_REALTIME";
    + case CLOCK_MONOTONIC:
    + return "CLOCK_MONOTONIC";
    + case CLOCK_PROCESS_CPUTIME_ID:
    + return "CLOCK_PROCESS_CPUTIME_ID";
    + case CLOCK_THREAD_CPUTIME_ID:
    + return "CLOCK_THREAD_CPUTIME_ID";
    + case CLOCK_MONOTONIC_RAW:
    + return "CLOCK_MONOTONIC_RAW";
    + case CLOCK_REALTIME_COARSE:
    + return "CLOCK_REALTIME_COARSE";
    + case CLOCK_MONOTONIC_COARSE:
    + return "CLOCK_MONOTONIC_COARSE";
    + case CLOCK_BOOTTIME:
    + return "CLOCK_BOOTTIME";
    + case CLOCK_REALTIME_ALARM:
    + return "CLOCK_REALTIME_ALARM";
    + case CLOCK_BOOTTIME_ALARM:
    + return "CLOCK_BOOTTIME_ALARM";
    + case CLOCK_TAI:
    + return "CLOCK_TAI";
    + };
    + return "UNKNOWN_CLOCKID";
    +}
    +
    +/* returns 1 if a <= b, 0 otherwise */
    +static inline int in_order(struct timespec a, struct timespec b)
    +{
    + /* use unsigned to avoid false positives on 2038 rollover */
    + if ((unsigned long)a.tv_sec < (unsigned long)b.tv_sec)
    + return 1;
    + if ((unsigned long)a.tv_sec > (unsigned long)b.tv_sec)
    + return 0;
    + if (a.tv_nsec > b.tv_nsec)
    + return 0;
    + return 1;
    +}
    +
    +
    +
    +int consistency_test(int clock_type, unsigned long seconds)
    +{
    + struct timespec list[CALLS_PER_LOOP];
    + int i, inconsistent;
    + long now, then;
    + time_t t;
    + char *start_str;
    +
    + clock_gettime(clock_type, &list[0]);
    + now = then = list[0].tv_sec;
    +
    + /* timestamp start of test */
    + t = time(0);
    + start_str = ctime(&t);
    +
    + while (seconds == -1 || now - then < seconds) {
    + inconsistent = 0;
    +
    + /* Fill list */
    + for (i = 0; i < CALLS_PER_LOOP; i++)
    + clock_gettime(clock_type, &list[i]);
    +
    + /* Check for inconsistencies */
    + for (i = 0; i < CALLS_PER_LOOP - 1; i++)
    + if (!in_order(list[i], list[i+1]))
    + inconsistent = i;
    +
    + /* display inconsistency */
    + if (inconsistent) {
    + unsigned long long delta;
    +
    + printf("\%s\n", start_str);
    + for (i = 0; i < CALLS_PER_LOOP; i++) {
    + if (i == inconsistent)
    + printf("--------------------\n");
    + printf("%lu:%lu\n", list[i].tv_sec,
    + list[i].tv_nsec);
    + if (i == inconsistent + 1)
    + printf("--------------------\n");
    + }
    + delta = list[inconsistent].tv_sec * NSEC_PER_SEC;
    + delta += list[inconsistent].tv_nsec;
    + delta -= list[inconsistent+1].tv_sec * NSEC_PER_SEC;
    + delta -= list[inconsistent+1].tv_nsec;
    + printf("Delta: %llu ns\n", delta);
    + fflush(0);
    + /* timestamp inconsistency*/
    + t = time(0);
    + printf("%s\n", ctime(&t));
    + printf("[FAILED]\n");
    + return -1;
    + }
    + now = list[0].tv_sec;
    + }
    + printf("[OK]\n");
    + return 0;
    +}
    +
    +
    +int main(int argc, char *argv[])
    +{
    + int clockid, opt;
    + int userclock = CLOCK_REALTIME;
    + int maxclocks = NR_CLOCKIDS;
    + int runtime = 30;
    + struct timespec ts;
    +
    + /* Process arguments */
    + while ((opt = getopt(argc, argv, "t:c:")) != -1) {
    + switch (opt) {
    + case 't':
    + runtime = atoi(optarg);
    + break;
    + case 'c':
    + userclock = atoi(optarg);
    + maxclocks = userclock + 1;
    + break;
    + default:
    + printf("Usage: %s [-t <secs>] [-c <clockid>]\n", argv[0]);
    + printf(" -t: Number of seconds to run\n");
    + printf(" -c: clockid to use (default, all clockids)\n");
    + exit(-1);
    + }
    + }
    +
    + setbuf(stdout, NULL);
    +
    + for (clockid = userclock; clockid < maxclocks; clockid++) {
    +
    + if (clockid == CLOCK_HWSPECIFIC)
    + continue;
    +
    + if (!clock_gettime(clockid, &ts)) {
    + printf("Consistent %-30s ", clockstring(clockid));
    + if (consistency_test(clockid, runtime))
    + return ksft_exit_fail();
    + }
    + }
    + return ksft_exit_pass();
    +}
    --
    1.9.1


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