This patch adds the change_skew test which validates the
adjtimex freq can be set to various values and then using
the inconsistency-check, raw_skew, and nanosleep tests
ensures time behaves properly.
Cc: Shuah Khan <shua...@osg.samsung.com>
Cc: Prarit Bhargava <pra...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Richard Cochran <richardcoch...@gmail.com>
Signed-off-by: John Stultz <john.stu...@linaro.org>
---
tools/testing/selftests/timers/Makefile | 3 +-
tools/testing/selftests/timers/change_skew.c | 93 ++++++++++++++++++++++++++++
2 files changed, 95 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timers/change_skew.c
diff --git a/tools/testing/selftests/timers/Makefile
b/tools/testing/selftests/timers/Makefile
index 4e3eef6..c3e32f1 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -2,7 +2,7 @@ CFLAGS += -O3 -Wl,-no-as-needed
LDFLAGS += -lrt -lpthread
bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \
set-timer-lat threadtest mqueue-lat valid-adjtimex \
- alarmtimer-suspend
+ alarmtimer-suspend change_skew
all: ${bins}
@@ -24,6 +24,7 @@ run_tests: all
run_destructive_tests: run_tests
./alarmtimer-suspend
./valid-adjtimex
+ ./change_skew
clean:
rm -f ${bins}
diff --git a/tools/testing/selftests/timers/change_skew.c
b/tools/testing/selftests/timers/change_skew.c
new file mode 100644
index 0000000..454cfca
--- /dev/null
+++ b/tools/testing/selftests/timers/change_skew.c
@@ -0,0 +1,93 @@
+/* ADJ_FREQ Skew change test
+ * by: john stultz (johns...@us.ibm.com)
+ * (C) Copyright IBM 2012
+ * Licensed under the GPLv2
+ *
+ * NOTE: This is a meta-test which cranks the ADJ_FREQ knob and
+ * then uses other tests to detect problems. Thus this test requires
+ * that the raw_skew, inconsistency-check and nanosleep tests be
+ * present in the same directory it is run from.
+ *
+ * To build:
+ * $ gcc change_skew.c -o change_skew -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 <sys/time.h>
+#include <sys/timex.h>
+#include <time.h>
+
+#define NSEC_PER_SEC 1000000000LL
+
+
+int change_skew_test(int ppm)
+{
+ struct timex tx;
+ int ret;
+
+ tx.modes = ADJ_FREQUENCY;
+ tx.freq = ppm << 16;
+
+ ret = adjtimex(&tx);
+ if (ret < 0) {
+ printf("Error adjusting freq\n");
+ return ret;
+ }
+
+ ret = system("./raw_skew");
+ ret |= system("./inconsistency-check");
+ ret |= system("./nanosleep");
+
+ return ret;
+}
+
+
+int main(int argv, char** argc)
+{
+ struct timex tx;
+ int i, ret;
+
+ int ppm[5] = {0, 250, 500, -250, -500};
+
+ /* Kill ntpd */
+ system("killall -9 ntpd");
+
+ /* Make sure there's no offset adjustment going on */
+ tx.modes = ADJ_OFFSET;
+ tx.offset = 0;
+ ret = adjtimex(&tx);
+
+ if (ret < 0) {
+ printf("Maybe you're not running as root?\n");
+ return -1;
+ }
+
+ for (i=0; i < 5; i++) {
+ printf("Using %i ppm adjustment\n", ppm[i]);
+ ret = change_skew_test(ppm[i]);
+ if (ret)
+ break;
+ }
+
+ /* Set things back */
+ tx.modes = ADJ_FREQUENCY;
+ tx.offset = 0;
+ adjtimex(&tx);
+
+ if (ret)
+ printf("[FAIL]");
+ else
+ printf("[OK]");
+ return ret;
+}
--
1.9.1
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