From: John Stultz <john.stultz@linaro.org>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: John Stultz <john.stultz@linaro.org>,
Shuah Khan <shuahkh@osg.samsung.com>,
Prarit Bhargava <prarit@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Richard Cochran <richardcochran@gmail.com>
Subject: [PATCH 13/19] selftests/timers: Add skew_consistency test from the timetests suite
Date: Wed, 11 Mar 2015 17:40:09 -0700 [thread overview]
Message-ID: <1426120815-32528-14-git-send-email-john.stultz@linaro.org> (raw)
In-Reply-To: <1426120815-32528-1-git-send-email-john.stultz@linaro.org>
This change adds the skew_consistency test, which twists the
ADJ_FREQUENCY knob back and forth and watches for timekeeping
inconsistencies.
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 | 3 +-
tools/testing/selftests/timers/skew_consistency.c | 89 +++++++++++++++++++++++
2 files changed, 91 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timers/skew_consistency.c
diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index 55b74cc..4b6b5c3 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -4,7 +4,7 @@ CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
LDFLAGS += -lrt -lpthread
bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \
set-timer-lat threadtest mqueue-lat valid-adjtimex \
- alarmtimer-suspend change_skew
+ alarmtimer-suspend change_skew skew_consistency
all: ${bins}
@@ -27,6 +27,7 @@ run_destructive_tests: run_tests
./alarmtimer-suspend
./valid-adjtimex
./change_skew
+ ./skew_consistency
clean:
rm -f ${bins}
diff --git a/tools/testing/selftests/timers/skew_consistency.c b/tools/testing/selftests/timers/skew_consistency.c
new file mode 100644
index 0000000..5562f84
--- /dev/null
+++ b/tools/testing/selftests/timers/skew_consistency.c
@@ -0,0 +1,89 @@
+/* ADJ_FREQ Skew consistency test
+ * by: john stultz (johnstul@us.ibm.com)
+ * (C) Copyright IBM 2012
+ * Licensed under the GPLv2
+ *
+ * NOTE: This is a meta-test which cranks the ADJ_FREQ knob back
+ * and forth and watches for consistency problems. Thus this test requires
+ * that the inconsistency-check tests be present in the same directory it
+ * is run from.
+ *
+ * To build:
+ * $ gcc skew_consistency.c -o skew_consistency -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 <stdlib.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.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
+
+#define NSEC_PER_SEC 1000000000LL
+
+int main(int argv, char **argc)
+{
+ struct timex tx;
+ int ret, ppm;
+ pid_t pid;
+
+
+ printf("Running Asyncrhonous Frequency Changing Tests...\n");
+
+ pid = fork();
+ if (!pid)
+ return system("./inconsistency-check -c 1 -t 600");
+
+ ppm = 500;
+ ret = 0;
+
+ while (pid != waitpid(pid, &ret, WNOHANG)) {
+ ppm = -ppm;
+ tx.modes = ADJ_FREQUENCY;
+ tx.freq = ppm << 16;
+ adjtimex(&tx);
+ usleep(500000);
+ }
+
+ /* Set things back */
+ tx.modes = ADJ_FREQUENCY;
+ tx.offset = 0;
+ adjtimex(&tx);
+
+
+ if (ret) {
+ printf("[FAILED]\n");
+ return ksft_exit_fail();
+ }
+ printf("[OK]\n");
+ return ksft_exit_pass();
+}
--
1.9.1
next prev parent reply other threads:[~2015-03-12 0:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-12 0:39 [PATCH 00/19 v4] Add timekeeping tests to kernel selftests John Stultz
2015-03-12 0:39 ` [PATCH 01/19] selftests/timers: Cleanup Makefile to make it easier to add future tests John Stultz
2015-03-12 0:39 ` [PATCH 02/19] selftests/timers: Quiet warning due to lack of return check on brk John Stultz
2015-03-12 0:39 ` [PATCH 03/19] selftests/timers: Add nanosleep test from timetest suite John Stultz
2015-03-12 0:40 ` [PATCH 04/19] selftests/timers: Add inconsistency-check test from timetests John Stultz
2015-03-12 0:40 ` [PATCH 05/19] selftests/timers: Add nsleep-lat test from timetest suite John Stultz
2015-03-12 0:40 ` [PATCH 06/19] selftests/timers: Add clock skew estimation " John Stultz
2015-03-12 0:40 ` [PATCH 07/19] selftests/timers: Add set-timer-lat " John Stultz
2015-03-12 0:40 ` [PATCH 08/19] selftests/timers: Add threaded time inconsistency " John Stultz
2015-03-12 0:40 ` [PATCH 09/19] selftests/timers: Add mqueue latency test from the " John Stultz
2015-03-12 0:40 ` [PATCH 10/19] selftests/timers: Add adjtimex validation test from " John Stultz
2015-03-12 0:40 ` [PATCH 11/19] selftests/timers: Add alarmtimer-suspend test from timetests suite John Stultz
2015-03-12 0:40 ` [PATCH 12/19] selftests/timers: Add change_skew test from timetest suite John Stultz
2015-03-12 0:40 ` John Stultz [this message]
2015-03-12 0:40 ` [PATCH 14/19] selftests/timers: Add clocksource-switch " John Stultz
2015-03-12 0:40 ` [PATCH 15/19] selftests/timers: Add leap-a-day " John Stultz
2015-03-12 0:40 ` [PATCH 16/19] selftests/timers: Add leapcrash test from the " John Stultz
2015-03-12 0:40 ` [PATCH 17/19] selftests/timers: Add set-tai " John Stultz
2015-03-12 0:40 ` [PATCH 18/19] selftests/timers: Add set-2038 test from " John Stultz
2015-03-12 0:40 ` [PATCH 19/19] MAINTAINERS: Add selftests/timers to the timekeeping maintainance list John Stultz
2015-03-12 19:25 ` [PATCH 00/19 v4] Add timekeeping tests to kernel selftests Shuah Khan
-- strict thread matches above, loose matches on Subject: below --
2015-03-02 21:09 [PATCH 00/19 v3] Add timekeeping tests to kernel selftest John Stultz
2015-03-02 21:10 ` [PATCH 13/19] selftests/timers: Add skew_consistency test from the timetests suite John Stultz
2015-02-25 22:32 [RFC][PATCH 00/19] Add timekeeping tests to kernel selftest John Stultz
2015-02-25 22:32 ` [PATCH 13/19] selftests/timers: Add skew_consistency test from the timetests suite John Stultz
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