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Subject[PATCH 2/2][RFC] kselftest: timers: Add adjtick test to validate adjtimex() tick adjustments
Date
Recently an issue was reported that was difficult to detect except
by tweaking the adjtimex tick value, and noticing how quickly the
adjustment took to be made:
https://lkml.org/lkml/2015/9/1/488

Thus this patch introduces a new test which manipulates the adjtimex
tick value and validates the results are what we expect.

Cc: Nuno Gonçalves <nunojpg@gmail.com>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
tools/testing/selftests/timers/Makefile | 3 +-
tools/testing/selftests/timers/adjtick.c | 186 +++++++++++++++++++++++++++++++
2 files changed, 188 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timers/adjtick.c

diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index 89a3f44..4a1be1b 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -8,7 +8,7 @@ LDFLAGS += -lrt -lpthread
TEST_PROGS = posix_timers nanosleep nsleep-lat set-timer-lat mqueue-lat \
inconsistency-check raw_skew threadtest rtctest

-TEST_PROGS_EXTENDED = alarmtimer-suspend valid-adjtimex change_skew \
+TEST_PROGS_EXTENDED = alarmtimer-suspend valid-adjtimex adjtick change_skew \
skew_consistency clocksource-switch leap-a-day \
leapcrash set-tai set-2038

@@ -24,6 +24,7 @@ include ../lib.mk
run_destructive_tests: run_tests
./alarmtimer-suspend
./valid-adjtimex
+ ./adjtick
./change_skew
./skew_consistency
./clocksource-switch
diff --git a/tools/testing/selftests/timers/adjtick.c b/tools/testing/selftests/timers/adjtick.c
new file mode 100644
index 0000000..b13c7fc
--- /dev/null
+++ b/tools/testing/selftests/timers/adjtick.c
@@ -0,0 +1,186 @@
+/* adjtimex() tick adjustment test
+ * by: John Stultz <john.stultz@linaro.org>
+ * (C) Copyright Linaro Limited 2015
+ * Licensed under the GPLv2
+ *
+ * To build:
+ * $ gcc adjtick.c -o adjtick -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 <sys/time.h>
+#include <sys/timex.h>
+#include <time.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 CLOCK_MONOTONIC_RAW 4
+#define NSEC_PER_SEC 1000000000LL
+#define MILLION 1000000
+
+long long llabs(long long val)
+{
+ if (val < 0)
+ val = -val;
+ return val;
+}
+
+unsigned long long ts_to_nsec(struct timespec ts)
+{
+ return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
+}
+
+struct timespec nsec_to_ts(long long ns)
+{
+ struct timespec ts;
+
+ ts.tv_sec = ns/NSEC_PER_SEC;
+ ts.tv_nsec = ns%NSEC_PER_SEC;
+ return ts;
+}
+
+long long diff_timespec(struct timespec start, struct timespec end)
+{
+ long long start_ns, end_ns;
+
+ start_ns = ts_to_nsec(start);
+ end_ns = ts_to_nsec(end);
+ return end_ns - start_ns;
+}
+
+void get_monotonic_and_raw(struct timespec *mon, struct timespec *raw)
+{
+ struct timespec start, mid, end;
+ long long diff = 0, tmp;
+ int i;
+
+ clock_gettime(CLOCK_MONOTONIC, mon);
+ clock_gettime(CLOCK_MONOTONIC_RAW, raw);
+
+ /* Try to get a more tightly bound pairing */
+ for (i = 0; i < 3; i++) {
+ long long newdiff;
+
+ clock_gettime(CLOCK_MONOTONIC, &start);
+ clock_gettime(CLOCK_MONOTONIC_RAW, &mid);
+ clock_gettime(CLOCK_MONOTONIC, &end);
+
+ newdiff = diff_timespec(start, end);
+ if (diff == 0 || newdiff < diff) {
+ diff = newdiff;
+ *raw = mid;
+ tmp = (ts_to_nsec(start) + ts_to_nsec(end))/2;
+ *mon = nsec_to_ts(tmp);
+ }
+ }
+}
+
+long long get_ppm_drift(void)
+{
+ struct timespec mon_start, raw_start, mon_end, raw_end;
+ long long delta1, delta2, eppm;
+
+ get_monotonic_and_raw(&mon_start, &raw_start);
+
+ sleep(10);
+
+ get_monotonic_and_raw(&mon_end, &raw_end);
+
+ delta1 = diff_timespec(mon_start, mon_end);
+ delta2 = diff_timespec(raw_start, raw_end);
+
+ eppm = (delta1*MILLION)/delta2 - MILLION;
+ return eppm;
+}
+
+int check_tick_adj(long tickval)
+{
+ long long eppm, ppm;
+ struct timex tx1;
+
+ tx1.modes = ADJ_TICK;
+ tx1.modes |= ADJ_OFFSET;
+ tx1.modes |= ADJ_FREQUENCY;
+ tx1.offset = 0;
+ tx1.freq = 0;
+ tx1.tick = tickval;
+ adjtimex(&tx1);
+ sleep(1);
+
+ ppm = ((long long)tickval * MILLION)/10000 - MILLION;
+ printf("Estimating tick (act: %ld usec, %lld ppm): ", tickval, ppm);
+
+ eppm = get_ppm_drift();
+ printf("%lld usec, %lld ppm", 10000 + (10000 * eppm / MILLION), eppm);
+
+ tx1.modes = 0;
+ adjtimex(&tx1);
+ if (tx1.offset || tx1.freq || tx1.tick != tickval) {
+ printf("WARNING: Unexpected adjtimex return values, make sure ntpd is not running. ");
+ return -1;
+ }
+
+ if (llabs(eppm - ppm) > 10) {
+ printf(" [FAILED]\n");
+ return -1;
+ }
+ printf(" [OK]\n");
+ return 0;
+}
+
+int main(int argv, char **argc)
+{
+ struct timespec raw;
+ long tick, err;
+ struct timex tx1;
+
+ err = 0;
+ setbuf(stdout, NULL);
+
+ if (clock_gettime(CLOCK_MONOTONIC_RAW, &raw)) {
+ printf("ERR: NO CLOCK_MONOTONIC_RAW\n");
+ return -1;
+ }
+
+ for (tick = 9000; tick < 11000; tick += 250)
+ if (check_tick_adj(tick)) {
+ err = 1;
+ break;
+ }
+
+ /* Reset things to zero */
+ tx1.modes = ADJ_TICK;
+ tx1.modes |= ADJ_OFFSET;
+ tx1.modes |= ADJ_FREQUENCY;
+ tx1.offset = 0;
+ tx1.freq = 0;
+ tx1.tick = 10000;
+ adjtimex(&tx1);
+
+ if (err)
+ return ksft_exit_fail();
+ return ksft_exit_pass();
+}
--
1.9.1


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