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Commit 274d631e authored by John Stultz's avatar John Stultz Committed by Shuah Khan
Browse files

selftests/timers: Add mqueue latency test from the timetest suite 



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: default avatarJohn Stultz <john.stultz@linaro.org>
Tested-by: default avatarPrarit Bhargava <prarit@redhat.com>
Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
parent e39b60f3

tools/testing/selftests/timers/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -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

tools/testing/selftests/timers/mqueue-lat.c

0 → 100644
+124 −0
Original line number Diff line number Diff line 
/* 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();

}