Wake Liu
7b944e55b5
This partially reverts commit 80fa614e2f ("selftests: timers: Remove
local NSEC_PER_SEC and USEC_PER_SEC defines").
The original commit removed local definitions of NSEC_PER_SEC and
USEC_PER_SEC in favor of including <include/vdso/time64.h>. However,
NSEC_PER_SEC in vdso/time64.h is defined as 1000000000L, which is
32-bit on 32-bit architectures. This causes integer overflow warnings
in several timer tests when doing arithmetic like NSEC_PER_SEC * 10 on
32-bit systems.
To fix this, restore the local definitions of NSEC_PER_SEC and
USEC_PER_SEC in the test files, but use "LL" suffix consistently
(1000000000LL and 1000000LL) to ensure 64-bit arithmetic and avoid
overflows.
We keep the cleanup from the original commit that renamed plural
definitions (NSECS_PER_SEC/USECS_PER_SEC) to singular ones in
posix_timers.c, but we now define them locally there as well.
This also removes the dependency of the selftests on the internal
kernel header <include/vdso/time64.h>.
Signed-off-by: Wake Liu <wakel@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: John Stultz <jstultz@google.com>
Link: https://patch.msgid.link/20260610014721.718362-1-wakel@google.com
Bug: 444295917
(cherry picked from commit f44ce7fdbdd00a596455b8689b62c12d5530d610
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core)
Change-Id: I6ff5716b95ae429fe39e40034ada78d633e12956
Signed-off-by: Carlos Llamas <cmllamas@google.com>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/* 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>
|
|
#include "kselftest.h"
|
|
|
|
#define NSEC_PER_SEC 1000000000LL
|
|
|
|
|
|
#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 : ");
|
|
fflush(stdout);
|
|
|
|
ret = mqueue_lat_test();
|
|
if (ret < 0) {
|
|
printf("[FAILED]\n");
|
|
ksft_exit_fail();
|
|
}
|
|
printf("[OK]\n");
|
|
ksft_exit_pass();
|
|
}
|