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Message-Id: <1425330612-24280-5-git-send-email-john.stultz@linaro.org>
Date: Mon, 2 Mar 2015 13:09:57 -0800
From: John Stultz <john.stultz@...aro.org>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
Shuah Khan <shuahkh@....samsung.com>,
Prarit Bhargava <prarit@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Richard Cochran <richardcochran@...il.com>
Subject: [PATCH 04/19] 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@....samsung.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Richard Cochran <richardcochran@...il.com>
Signed-off-by: John Stultz <john.stultz@...aro.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@...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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