b841065043
There is no need to keep timers tests in sync with external timers repo. Drop support for !KTEST to support for building and running timers tests without kselftest framework. Reference: https://lkml.org/lkml/2017/8/10/952 Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Acked-by: John Stultz <john.stultz@linaro.org>
143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/* CLOCK_MONOTONIC vs CLOCK_MONOTONIC_RAW skew test
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* by: john stultz (johnstul@us.ibm.com)
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* John Stultz <john.stultz@linaro.org>
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* (C) Copyright IBM 2012
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* (C) Copyright Linaro Limited 2015
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* Licensed under the GPLv2
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*
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* To build:
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* $ gcc raw_skew.c -o raw_skew -lrt
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/timex.h>
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#include <time.h>
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#include "../kselftest.h"
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#define CLOCK_MONOTONIC_RAW 4
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#define NSEC_PER_SEC 1000000000LL
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#define shift_right(x, s) ({ \
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__typeof__(x) __x = (x); \
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__typeof__(s) __s = (s); \
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__x < 0 ? -(-__x >> __s) : __x >> __s; \
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})
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long long llabs(long long val)
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{
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if (val < 0)
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val = -val;
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return val;
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}
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unsigned long long ts_to_nsec(struct timespec ts)
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{
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return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
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}
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struct timespec nsec_to_ts(long long ns)
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{
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struct timespec ts;
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ts.tv_sec = ns/NSEC_PER_SEC;
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ts.tv_nsec = ns%NSEC_PER_SEC;
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return ts;
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}
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long long diff_timespec(struct timespec start, struct timespec end)
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{
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long long start_ns, end_ns;
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start_ns = ts_to_nsec(start);
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end_ns = ts_to_nsec(end);
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return end_ns - start_ns;
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}
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void get_monotonic_and_raw(struct timespec *mon, struct timespec *raw)
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{
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struct timespec start, mid, end;
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long long diff = 0, tmp;
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int i;
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for (i = 0; i < 3; i++) {
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long long newdiff;
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clock_gettime(CLOCK_MONOTONIC, &start);
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clock_gettime(CLOCK_MONOTONIC_RAW, &mid);
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clock_gettime(CLOCK_MONOTONIC, &end);
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newdiff = diff_timespec(start, end);
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if (diff == 0 || newdiff < diff) {
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diff = newdiff;
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*raw = mid;
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tmp = (ts_to_nsec(start) + ts_to_nsec(end))/2;
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*mon = nsec_to_ts(tmp);
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}
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}
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}
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int main(int argv, char **argc)
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{
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struct timespec mon, raw, start, end;
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long long delta1, delta2, interval, eppm, ppm;
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struct timex tx1, tx2;
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setbuf(stdout, NULL);
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if (clock_gettime(CLOCK_MONOTONIC_RAW, &raw)) {
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printf("ERR: NO CLOCK_MONOTONIC_RAW\n");
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return -1;
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}
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tx1.modes = 0;
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adjtimex(&tx1);
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get_monotonic_and_raw(&mon, &raw);
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start = mon;
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delta1 = diff_timespec(mon, raw);
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if (tx1.offset)
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printf("WARNING: ADJ_OFFSET in progress, this will cause inaccurate results\n");
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printf("Estimating clock drift: ");
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sleep(120);
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get_monotonic_and_raw(&mon, &raw);
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end = mon;
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tx2.modes = 0;
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adjtimex(&tx2);
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delta2 = diff_timespec(mon, raw);
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interval = diff_timespec(start, end);
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/* calculate measured ppm between MONOTONIC and MONOTONIC_RAW */
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eppm = ((delta2-delta1)*NSEC_PER_SEC)/interval;
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eppm = -eppm;
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printf("%lld.%i(est)", eppm/1000, abs((int)(eppm%1000)));
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/* Avg the two actual freq samples adjtimex gave us */
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ppm = (tx1.freq + tx2.freq) * 1000 / 2;
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ppm = (long long)tx1.freq * 1000;
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ppm = shift_right(ppm, 16);
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printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
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if (llabs(eppm - ppm) > 1000) {
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printf(" [FAILED]\n");
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return ksft_exit_fail();
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}
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printf(" [OK]\n");
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return ksft_exit_pass();
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}
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