rcutorture: Abstract torture_onoff()
Because online/offline torturing is not specific to RCU, this commit abstracts it into the kernel/torture.c module to allow other torture tests to use it. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney
186
kernel/torture.c
186
kernel/torture.c
@@ -54,6 +54,192 @@ EXPORT_SYMBOL_GPL(fullstop);
|
||||
DEFINE_MUTEX(fullstop_mutex);
|
||||
EXPORT_SYMBOL_GPL(fullstop_mutex);
|
||||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
|
||||
/*
|
||||
* Variables for online-offline handling. Only present if CPU hotplug
|
||||
* is enabled, otherwise does nothing.
|
||||
*/
|
||||
|
||||
static struct task_struct *onoff_task;
|
||||
static long onoff_holdoff;
|
||||
static long onoff_interval;
|
||||
static long n_offline_attempts;
|
||||
static long n_offline_successes;
|
||||
static unsigned long sum_offline;
|
||||
static int min_offline = -1;
|
||||
static int max_offline;
|
||||
static long n_online_attempts;
|
||||
static long n_online_successes;
|
||||
static unsigned long sum_online;
|
||||
static int min_online = -1;
|
||||
static int max_online;
|
||||
|
||||
/*
|
||||
* Execute random CPU-hotplug operations at the interval specified
|
||||
* by the onoff_interval.
|
||||
*/
|
||||
static int
|
||||
torture_onoff(void *arg)
|
||||
{
|
||||
int cpu;
|
||||
unsigned long delta;
|
||||
int maxcpu = -1;
|
||||
DEFINE_TORTURE_RANDOM(rand);
|
||||
int ret;
|
||||
unsigned long starttime;
|
||||
|
||||
VERBOSE_TOROUT_STRING("torture_onoff task started");
|
||||
for_each_online_cpu(cpu)
|
||||
maxcpu = cpu;
|
||||
WARN_ON(maxcpu < 0);
|
||||
if (onoff_holdoff > 0) {
|
||||
VERBOSE_TOROUT_STRING("torture_onoff begin holdoff");
|
||||
schedule_timeout_interruptible(onoff_holdoff);
|
||||
VERBOSE_TOROUT_STRING("torture_onoff end holdoff");
|
||||
}
|
||||
while (!torture_must_stop()) {
|
||||
cpu = (torture_random(&rand) >> 4) % (maxcpu + 1);
|
||||
if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) {
|
||||
if (verbose)
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
"torture_onoff task: offlining %d\n",
|
||||
torture_type, cpu);
|
||||
starttime = jiffies;
|
||||
n_offline_attempts++;
|
||||
ret = cpu_down(cpu);
|
||||
if (ret) {
|
||||
if (verbose)
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
"torture_onoff task: offline %d failed: errno %d\n",
|
||||
torture_type, cpu, ret);
|
||||
} else {
|
||||
if (verbose)
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
"torture_onoff task: offlined %d\n",
|
||||
torture_type, cpu);
|
||||
n_offline_successes++;
|
||||
delta = jiffies - starttime;
|
||||
sum_offline += delta;
|
||||
if (min_offline < 0) {
|
||||
min_offline = delta;
|
||||
max_offline = delta;
|
||||
}
|
||||
if (min_offline > delta)
|
||||
min_offline = delta;
|
||||
if (max_offline < delta)
|
||||
max_offline = delta;
|
||||
}
|
||||
} else if (cpu_is_hotpluggable(cpu)) {
|
||||
if (verbose)
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
"torture_onoff task: onlining %d\n",
|
||||
torture_type, cpu);
|
||||
starttime = jiffies;
|
||||
n_online_attempts++;
|
||||
ret = cpu_up(cpu);
|
||||
if (ret) {
|
||||
if (verbose)
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
"torture_onoff task: online %d failed: errno %d\n",
|
||||
torture_type, cpu, ret);
|
||||
} else {
|
||||
if (verbose)
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
"torture_onoff task: onlined %d\n",
|
||||
torture_type, cpu);
|
||||
n_online_successes++;
|
||||
delta = jiffies - starttime;
|
||||
sum_online += delta;
|
||||
if (min_online < 0) {
|
||||
min_online = delta;
|
||||
max_online = delta;
|
||||
}
|
||||
if (min_online > delta)
|
||||
min_online = delta;
|
||||
if (max_online < delta)
|
||||
max_online = delta;
|
||||
}
|
||||
}
|
||||
schedule_timeout_interruptible(onoff_interval);
|
||||
}
|
||||
VERBOSE_TOROUT_STRING("torture_onoff task stopping");
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
|
||||
|
||||
/*
|
||||
* Initiate online-offline handling.
|
||||
*/
|
||||
int torture_onoff_init(long ooholdoff, long oointerval)
|
||||
{
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
int ret;
|
||||
|
||||
onoff_holdoff = ooholdoff;
|
||||
onoff_interval = oointerval;
|
||||
if (onoff_interval <= 0)
|
||||
return 0;
|
||||
onoff_task = kthread_run(torture_onoff, NULL, "torture_onoff");
|
||||
if (IS_ERR(onoff_task)) {
|
||||
ret = PTR_ERR(onoff_task);
|
||||
onoff_task = NULL;
|
||||
return ret;
|
||||
}
|
||||
torture_shuffle_task_register(onoff_task);
|
||||
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(torture_onoff_init);
|
||||
|
||||
/*
|
||||
* Clean up after online/offline testing.
|
||||
*/
|
||||
void torture_onoff_cleanup(void)
|
||||
{
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
if (onoff_task == NULL)
|
||||
return;
|
||||
VERBOSE_TOROUT_STRING("Stopping torture_onoff task");
|
||||
kthread_stop(onoff_task);
|
||||
onoff_task = NULL;
|
||||
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(torture_onoff_cleanup);
|
||||
|
||||
/*
|
||||
* Print online/offline testing statistics.
|
||||
*/
|
||||
char *torture_onoff_stats(char *page)
|
||||
{
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
page += sprintf(page,
|
||||
"onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ",
|
||||
n_online_successes, n_online_attempts,
|
||||
n_offline_successes, n_offline_attempts,
|
||||
min_online, max_online,
|
||||
min_offline, max_offline,
|
||||
sum_online, sum_offline, HZ);
|
||||
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
|
||||
return page;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(torture_onoff_stats);
|
||||
|
||||
/*
|
||||
* Were all the online/offline operations successful?
|
||||
*/
|
||||
bool torture_onoff_failures(void)
|
||||
{
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
return n_online_successes != n_online_attempts ||
|
||||
n_offline_successes != n_offline_attempts;
|
||||
#else /* #ifdef CONFIG_HOTPLUG_CPU */
|
||||
return false;
|
||||
#endif /* #else #ifdef CONFIG_HOTPLUG_CPU */
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(torture_onoff_failures);
|
||||
|
||||
#define TORTURE_RANDOM_MULT 39916801 /* prime */
|
||||
#define TORTURE_RANDOM_ADD 479001701 /* prime */
|
||||
#define TORTURE_RANDOM_REFRESH 10000
|
||||
|
||||
Reference in New Issue
Block a user