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torture: Break online and offline functions out of torture_onoff() 

This commit breaks torture_online() and torture_offline() out of
torture_onoff() in preparation for allowing waketorture finer-grained
control of its CPU-hotplug workload.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2016-04-20 17:18:41 -07:00
parent 6e8c66c867
commit d95f5ba90f
2 changed files with 108 additions and 64 deletions
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4
include/linux/torture.h
View File

@ -50,6 +50,10 @@
do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s); } while (0)
/* Definitions for online/offline exerciser. */
bool torture_offline(int cpu, long *n_onl_attempts, long *n_onl_successes,
unsigned long *sum_offl, int *min_onl, int *max_onl);
bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
unsigned long *sum_onl, int *min_onl, int *max_onl);
int torture_onoff_init(long ooholdoff, long oointerval);
void torture_onoff_stats(void);
bool torture_onoff_failures(void);

168
kernel/torture.c
View File

@ -81,6 +81,104 @@ static unsigned long sum_online;
static int min_online = -1;
static int max_online;
/*
* Attempt to take a CPU offline. Return false if the CPU is already
* offline or if it is not subject to CPU-hotplug operations. The
* caller can detect other failures by looking at the statistics.
*/
bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
unsigned long *sum_offl, int *min_offl, int *max_offl)
{
unsigned long delta;
int ret;
unsigned long starttime;
if (!cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
return false;
if (verbose)
pr_alert("%s" TORTURE_FLAG
"torture_onoff task: offlining %d\n",
torture_type, cpu);
starttime = jiffies;
(*n_offl_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_offl_successes)++;
delta = jiffies - starttime;
sum_offl += delta;
if (*min_offl < 0) {
*min_offl = delta;
*max_offl = delta;
}
if (*min_offl > delta)
*min_offl = delta;
if (*max_offl < delta)
*max_offl = delta;
}
return true;
}
EXPORT_SYMBOL_GPL(torture_offline);
/*
* Attempt to bring a CPU online. Return false if the CPU is already
* online or if it is not subject to CPU-hotplug operations. The
* caller can detect other failures by looking at the statistics.
*/
bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
unsigned long *sum_onl, int *min_onl, int *max_onl)
{
unsigned long delta;
int ret;
unsigned long starttime;
if (cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
return false;
if (verbose)
pr_alert("%s" TORTURE_FLAG
"torture_onoff task: onlining %d\n",
torture_type, cpu);
starttime = jiffies;
(*n_onl_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_onl_successes)++;
delta = jiffies - starttime;
*sum_onl += delta;
if (*min_onl < 0) {
*min_onl = delta;
*max_onl = delta;
}
if (*min_onl > delta)
*min_onl = delta;
if (*max_onl < delta)
*max_onl = delta;
}
return true;
}
EXPORT_SYMBOL_GPL(torture_online);
/*
* Execute random CPU-hotplug operations at the interval specified
* by the onoff_interval.
@ -89,11 +187,8 @@ 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)
@ -106,67 +201,12 @@ torture_onoff(void *arg)
}
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;
}
}
if (!torture_offline(cpu,
&n_offline_attempts, &n_offline_successes,
&sum_offline, &min_offline, &max_offline))
torture_online(cpu,
&n_online_attempts, &n_online_successes,
&sum_online, &min_online, &max_online);
schedule_timeout_interruptible(onoff_interval);
}
torture_kthread_stopping("torture_onoff");