Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756755AbbBEGiT (ORCPT ); Thu, 5 Feb 2015 01:38:19 -0500 Received: from mail-pa0-f49.google.com ([209.85.220.49]:43666 "EHLO mail-pa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754500AbbBEGh3 (ORCPT ); Thu, 5 Feb 2015 01:37:29 -0500 From: John Stultz To: Linux Kernel Mailing List Cc: John Stultz , Shuah Khan Subject: [PATCH 5/7] selftest/timers: Add nsleep-lat test from timetest suite Date: Wed, 4 Feb 2015 22:37:10 -0800 Message-Id: <1423118232-14096-6-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1423118232-14096-1-git-send-email-john.stultz@linaro.org> References: <1423118232-14096-1-git-send-email-john.stultz@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6009 Lines: 221 Adds my nanosleep latency test from the timetest suite. This checks to make sure we don't see "unreasonable" latencies (> 40ms) when calling nanosleep. Cc: Shuah Khan Signed-off-by: John Stultz --- tools/testing/selftests/timers/Makefile | 3 +- tools/testing/selftests/timers/nsleep-lat.c | 176 ++++++++++++++++++++++++++++ 2 files changed, 178 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/timers/nsleep-lat.c diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile index b202888..28c2184 100644 --- a/tools/testing/selftests/timers/Makefile +++ b/tools/testing/selftests/timers/Makefile @@ -1,12 +1,13 @@ CFLAGS += -O3 -Wl,-no-as-needed LDFLAGS += -lrt -lpthread -bins = posix_timers nanosleep inconsistency-check +bins = posix_timers nanosleep inconsistency-check nsleep-lat all: ${bins} run_tests: all ./posix_timers ./nanosleep + ./nsleep-lat ./inconsistency-check clean: rm -f ${bins} diff --git a/tools/testing/selftests/timers/nsleep-lat.c b/tools/testing/selftests/timers/nsleep-lat.c new file mode 100644 index 0000000..fe94f3af --- /dev/null +++ b/tools/testing/selftests/timers/nsleep-lat.c @@ -0,0 +1,176 @@ +/* Measure nanosleep timer latency + * by: john stultz (john.stultz@linaro.org) + * (C) Copyright Linaro 2013 + * Licensed under the GPLv2 + * + * To build: + * $ gcc nsleep-lat.c -o nsleep-lat -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 + +#define NSEC_PER_SEC 1000000000ULL + +#define UNRESONABLE_LATENCY 40000000 /* 40ms in nanosecs */ + + +#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 + +#define UNSUPPORTED 0xf00f + +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"; +} + +struct timespec timespec_add(struct timespec ts, unsigned long long ns) +{ + ts.tv_nsec += ns; + while(ts.tv_nsec >= NSEC_PER_SEC) { + ts.tv_nsec -= NSEC_PER_SEC; + ts.tv_sec++; + } + return ts; +} + + +long long timespec_sub(struct timespec a, struct timespec b) +{ + long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec; + ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec; + return ret; +} + +int nanosleep_lat_test(int clockid, long long ns) +{ + struct timespec start, end, target; + long long latency = 0; + int i, count; + + target.tv_sec = ns/NSEC_PER_SEC; + target.tv_nsec = ns%NSEC_PER_SEC; + + if (clock_gettime(clockid, &start)) + return UNSUPPORTED; + if (clock_nanosleep(clockid, 0, &target, NULL)) + return UNSUPPORTED; + + count = 10; + + /* First check relative latency */ + clock_gettime(clockid, &start); + for (i=0;i UNRESONABLE_LATENCY) { + printf("Large rel latency: %lld ns :", (timespec_sub(start, end)/count)-ns); + return -1; + } + + /* Next check absolute latency */ + for (i=0;i UNRESONABLE_LATENCY) { + printf("Large abs latency: %lld ns :", latency/count); + return -1; + } + + return 0; +} + + + +int main(int argc, char** argv) +{ + long long length; + int failed = 0, clockid, ret; + for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) { + + /* Skip cputime clockids since nanosleep won't increment cputime */ + if (clockid == CLOCK_PROCESS_CPUTIME_ID || + clockid == CLOCK_THREAD_CPUTIME_ID || + clockid == CLOCK_HWSPECIFIC) + continue; + + printf("nsleep latency %-31s ", clockstring(clockid)); + + length = 10; + while (length <= (NSEC_PER_SEC * 10)) { + ret = nanosleep_lat_test(clockid, length); + if (ret) + break; + length *= 100; + + } + + if (ret == UNSUPPORTED) { + printf("[UNSUPPORTED]\n"); + continue; + } + if (ret < 0) { + printf("[FAILED]\n"); + return -1; + } + printf("[OK]\n"); + } + return 0; +} -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/