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[67.170.153.23]) by mx.google.com with ESMTPSA id qm12sm43160405pdb.36.2015.02.25.14.32.31 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 25 Feb 2015 14:32:32 -0800 (PST) From: John Stultz To: Linux Kernel Mailing List Cc: John Stultz , Shuah Khan , Prarit Bhargava , Thomas Gleixner , Richard Cochran Subject: [PATCH 04/19] selftests/timers: Add inconsistency-check test from timetests Date: Wed, 25 Feb 2015 14:32:09 -0800 Message-Id: <1424903544-26855-5-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1424903544-26855-1-git-send-email-john.stultz@linaro.org> References: <1424903544-26855-1-git-send-email-john.stultz@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: john.stultz@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.170 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , This adds my inconsistency-test from my timetests suite, which checks for (single threaded) time inconsistencies across the various clockids. Cc: Shuah Khan Cc: Prarit Bhargava Cc: Thomas Gleixner Cc: Richard Cochran Signed-off-by: John Stultz --- tools/testing/selftests/timers/Makefile | 4 +- .../testing/selftests/timers/inconsistency-check.c | 199 +++++++++++++++++++++ 2 files changed, 201 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 469aaa6..b202888 100644 --- a/tools/testing/selftests/timers/Makefile +++ b/tools/testing/selftests/timers/Makefile @@ -1,12 +1,12 @@ CFLAGS += -O3 -Wl,-no-as-needed 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..d5e3f51 --- /dev/null +++ b/tools/testing/selftests/timers/inconsistency-check.c @@ -0,0 +1,199 @@ +/* Time inconsistency check test + * by: john stultz (johnstul@us.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 +#include +#include +#include +#include +#include +#include + +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, userclock = -1, maxclocks, opt; + 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 ] [-c ]\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); + + if (userclock == -1) { + userclock = CLOCK_REALTIME; + maxclocks = NR_CLOCKIDS; + } + + 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 -1; + } + } + + + return 0; +}