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    Subject[PATCH 09/19] selftests/timers: Add mqueue latency test from the timetest suite
    Date
    Add test to validate mqueue timeout latency from the timetest suite

    Cc: Shuah Khan <shuahkh@osg.samsung.com>
    Cc: Prarit Bhargava <prarit@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Richard Cochran <richardcochran@gmail.com>
    Signed-off-by: John Stultz <john.stultz@linaro.org>
    ---
    tools/testing/selftests/timers/Makefile | 3 +-
    tools/testing/selftests/timers/mqueue-lat.c | 124 ++++++++++++++++++++++++++++
    2 files changed, 126 insertions(+), 1 deletion(-)
    create mode 100644 tools/testing/selftests/timers/mqueue-lat.c

    diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
    index e53b675..d0bfb2d 100644
    --- a/tools/testing/selftests/timers/Makefile
    +++ b/tools/testing/selftests/timers/Makefile
    @@ -3,7 +3,7 @@ BUILD_FLAGS = -DKTEST
    CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
    LDFLAGS += -lrt -lpthread
    bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \
    - set-timer-lat threadtest
    + set-timer-lat threadtest mqueue-lat

    all: ${bins}

    @@ -12,6 +12,7 @@ run_tests: all
    ./nanosleep
    ./nsleep-lat
    ./set-timer-lat
    + ./mqueue-lat
    ./inconsistency-check
    ./raw_skew
    ./threadtest -t 30 -n 8
    diff --git a/tools/testing/selftests/timers/mqueue-lat.c b/tools/testing/selftests/timers/mqueue-lat.c
    new file mode 100644
    index 0000000..a2a3924
    --- /dev/null
    +++ b/tools/testing/selftests/timers/mqueue-lat.c
    @@ -0,0 +1,124 @@
    +/* Measure mqueue timeout latency
    + * by: john stultz (john.stultz@linaro.org)
    + * (C) Copyright Linaro 2013
    + *
    + * Inspired with permission from example test by:
    + * Romain Francoise <romain@orebokech.com>
    + * Licensed under the GPLv2
    + *
    + * To build:
    + * $ gcc mqueue-lat.c -o mqueue-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 <stdio.h>
    +#include <stdlib.h>
    +#include <time.h>
    +#include <sys/time.h>
    +#include <sys/timex.h>
    +#include <string.h>
    +#include <signal.h>
    +#include <errno.h>
    +#include <mqueue.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 NSEC_PER_SEC 1000000000ULL
    +
    +#define TARGET_TIMEOUT 100000000 /* 100ms in nanoseconds */
    +#define UNRESONABLE_LATENCY 40000000 /* 40ms in nanosecs */
    +
    +
    +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;
    +}
    +
    +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;
    +}
    +
    +int mqueue_lat_test(void)
    +{
    +
    + mqd_t q;
    + struct mq_attr attr;
    + struct timespec start, end, now, target;
    + int i, count, ret;
    +
    + q = mq_open("/foo", O_CREAT | O_RDONLY, 0666, NULL);
    + if (q < 0) {
    + perror("mq_open");
    + return -1;
    + }
    + mq_getattr(q, &attr);
    +
    +
    + count = 100;
    + clock_gettime(CLOCK_MONOTONIC, &start);
    +
    + for (i = 0; i < count; i++) {
    + char buf[attr.mq_msgsize];
    +
    + clock_gettime(CLOCK_REALTIME, &now);
    + target = now;
    + target = timespec_add(now, TARGET_TIMEOUT); /* 100ms */
    +
    + ret = mq_timedreceive(q, buf, sizeof(buf), NULL, &target);
    + if (ret < 0 && errno != ETIMEDOUT) {
    + perror("mq_timedreceive");
    + return -1;
    + }
    + }
    + clock_gettime(CLOCK_MONOTONIC, &end);
    +
    + mq_close(q);
    +
    + if ((timespec_sub(start, end)/count) > TARGET_TIMEOUT + UNRESONABLE_LATENCY)
    + return -1;
    +
    + return 0;
    +}
    +
    +int main(int argc, char **argv)
    +{
    + int ret;
    +
    + printf("Mqueue latency : ");
    +
    + ret = mqueue_lat_test();
    + if (ret < 0) {
    + printf("[FAILED]\n");
    + return ksft_exit_fail();
    + }
    + printf("[OK]\n");
    + return ksft_exit_pass();
    +}
    --
    1.9.1


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