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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-builtin.h"
#include <time.h>
#define MIN_TIMER_FREQ (1)
#define MAX_TIMER_FREQ (100000000)
#define DEFAULT_TIMER_FREQ (1000000)
static const stress_help_t help[] = {
{ "T N", "timer N", "start N workers producing timer events" },
{ NULL, "timer-freq F", "run timer(s) at F Hz, range 1 to 1000000000" },
{ NULL, "timer-ops N", "stop after N timer bogo events" },
{ NULL, "timer-rand", "enable random timer frequency" },
{ NULL, NULL, NULL }
};
#if defined(HAVE_LIB_RT) && \
defined(HAVE_TIMER_CREATE) && \
defined(HAVE_TIMER_DELETE) && \
defined(HAVE_TIMER_GETOVERRUN) && \
defined(HAVE_TIMER_SETTIME)
static stress_args_t *s_args;
static volatile uint64_t timer_settime_failure;
static uint64_t timer_overruns;
static timer_t timerid;
static double rate_ns;
static double time_end;
static bool timer_rand;
#endif
static const stress_opt_t opts[] = {
{ OPT_timer_freq, "timer-freq", TYPE_ID_UINT64, MIN_TIMER_FREQ, MAX_TIMER_FREQ, NULL },
{ OPT_timer_rand, "timer-rand", TYPE_ID_BOOL, 0, 1, NULL },
END_OPT,
};
#if defined(HAVE_LIB_RT) && \
defined(HAVE_TIMER_CREATE) && \
defined(HAVE_TIMER_DELETE) && \
defined(HAVE_TIMER_GETOVERRUN) && \
defined(HAVE_TIMER_SETTIME)
/*
* stress_timer_set()
* set timer, ensure it is never zero
*/
static void OPTIMIZE3 stress_timer_set(struct itimerspec *timer)
{
double rate;
if (UNLIKELY(timer_rand)) {
/* Mix in some random variation */
const double r = ((double)stress_mwc32modn(10000) - 5000.0) / 40000.0;
rate = rate_ns + (rate_ns * r);
} else {
rate = rate_ns;
}
timer->it_value.tv_sec = (time_t)rate / STRESS_NANOSECOND;
timer->it_value.tv_nsec = (suseconds_t)rate % STRESS_NANOSECOND;
if (timer->it_value.tv_sec == 0 &&
timer->it_value.tv_nsec < 1)
timer->it_value.tv_nsec = 1;
timer->it_interval.tv_sec = timer->it_value.tv_sec;
timer->it_interval.tv_nsec = timer->it_value.tv_nsec;
}
/*
* stress_proc_self_timer_read()
* exercise read of /proc/self/timers, Linux only
*/
static inline void stress_proc_self_timer_read(void)
{
#if defined(__linux__)
(void)stress_system_discard("/proc/self/timers");
#endif
}
/*
* stress_timer_handler()
* catch timer signal and cancel if no more runs flagged
*/
static void MLOCKED_TEXT OPTIMIZE3 stress_timer_handler(int sig)
{
struct itimerspec timer;
sigset_t mask;
int ret;
(void)sig;
if (sigpending(&mask) == 0)
if (sigismember(&mask, SIGINT))
goto cancel;
/* High freq timer, check periodically for timeout */
if (UNLIKELY(!stress_continue(s_args)))
goto cancel;
stress_bogo_inc(s_args);
if (UNLIKELY((stress_bogo_get(s_args) & 65535) == 0)) {
if (stress_time_now() > time_end)
goto cancel;
stress_proc_self_timer_read();
}
ret = timer_getoverrun(timerid);
if (ret > 0)
timer_overruns += (uint64_t)ret;
stress_timer_set(&timer);
if (timer_settime(timerid, 0, &timer, NULL) < 0)
timer_settime_failure++;
return;
cancel:
stress_continue_set_flag(false);
/* Cancel timer if we detect no more runs */
(void)shim_memset(&timer, 0, sizeof(timer));
if (UNLIKELY(timer_settime(timerid, 0, &timer, NULL) < 0))
timer_settime_failure++;
}
/*
* stress_timer
* stress timers
*/
static int stress_timer(stress_args_t *args)
{
struct sigevent sev;
struct itimerspec timer;
sigset_t mask;
uint64_t timer_freq = DEFAULT_TIMER_FREQ;
int n = 0, rc = EXIT_SUCCESS;
s_args = args;
time_end = args->time_end;
timer_settime_failure = 0;
timer_overruns = 0;
(void)sigemptyset(&mask);
(void)sigaddset(&mask, SIGINT);
(void)sigprocmask(SIG_SETMASK, &mask, NULL);
timer_rand = false;
(void)stress_get_setting("timer-rand", &timer_rand);
if (!stress_get_setting("timer-freq", &timer_freq)) {
if (g_opt_flags & OPT_FLAGS_MAXIMIZE)
timer_freq = MAX_TIMER_FREQ;
if (g_opt_flags & OPT_FLAGS_MINIMIZE)
timer_freq = MIN_TIMER_FREQ;
}
rate_ns = timer_freq ? (double)STRESS_NANOSECOND / (double)timer_freq :
(double)STRESS_NANOSECOND;
if (stress_sighandler(args->name, SIGRTMIN, stress_timer_handler, NULL) < 0)
return EXIT_FAILURE;
(void)shim_memset(&sev, 0, sizeof(sev));
sev.sigev_notify = SIGEV_SIGNAL;
sev.sigev_signo = SIGRTMIN;
sev.sigev_value.sival_ptr = &timerid;
if (timer_create(CLOCK_REALTIME, &sev, &timerid) < 0) {
if ((errno == EAGAIN) || (errno == ENOMEM) || (errno == ENOTSUP)) {
pr_inf_skip("%s: could not create timer, out of "
"resources, skipping stressor\n",
args->name);
return EXIT_NO_RESOURCE;
}
pr_fail("%s: timer_create failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
return EXIT_FAILURE;
}
stress_set_proc_state(args->name, STRESS_STATE_SYNC_WAIT);
stress_sync_start_wait(args);
stress_set_proc_state(args->name, STRESS_STATE_RUN);
stress_timer_set(&timer);
if (timer_settime(timerid, 0, &timer, NULL) < 0) {
pr_fail("%s: timer_settime failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
return EXIT_FAILURE;
}
do {
struct timespec req;
if (UNLIKELY(n++ >= 1024)) {
n = 0;
/* Exercise nanosleep on non-permitted timespec object values */
(void)shim_memset(&req, 0, sizeof(req));
req.tv_sec = -1;
VOID_RET(int, nanosleep(&req, NULL));
(void)shim_memset(&req, 0, sizeof(req));
req.tv_nsec = STRESS_NANOSECOND;
VOID_RET(int, nanosleep(&req, NULL));
}
req.tv_sec = 0;
req.tv_nsec = 10000000;
(void)nanosleep(&req, NULL);
} while (stress_continue(args));
/* stop timer */
(void)shim_memset(&timer, 0, sizeof(timer));
VOID_RET(int, timer_settime(timerid, 0, &timer, NULL));
if (timer_delete(timerid) < 0) {
pr_fail("%s: timer_delete failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
}
pr_dbg("%s: %" PRIu64 " timer overruns (instance %" PRIu32 ")\n",
args->name, timer_overruns, args->instance);
if (timer_settime_failure) {
pr_fail("%s: %" PRIu64 " timer settime calls failed\n",
args->name, timer_settime_failure);
rc = EXIT_FAILURE;
}
stress_set_proc_state(args->name, STRESS_STATE_DEINIT);
#if defined(__linux__)
/* Some BSD flavours segfault on duplicated timer_delete calls */
{
/* Re-delete already deleted timer */
VOID_RET(int, timer_delete(timerid));
/*
* The manual states that EINVAL is returned when
* an invalid timerid is used, in practice this
* will most probably segfault librt, so ignore this
* test case for now.
*
VOID_RET(int, timer_delete((timer_t)stress_mwc32()));
*/
}
#endif
return rc;
}
const stressor_info_t stress_timer_info = {
.stressor = stress_timer,
.classifier = CLASS_SIGNAL | CLASS_INTERRUPT | CLASS_OS,
.opts = opts,
.verify = VERIFY_ALWAYS,
.help = help
};
#else
const stressor_info_t stress_timer_info = {
.stressor = stress_unimplemented,
.classifier = CLASS_SIGNAL | CLASS_INTERRUPT | CLASS_OS,
.opts = opts,
.verify = VERIFY_ALWAYS,
.help = help,
.unimplemented_reason = "built without librt, timer_create(), timer_delete(), timer_getoverrun() or timer_settime()"
};
#endif
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