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Commit d95f5ba9 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 6e8c66c8

include/linux/torture.h

+4 −0
Original line number Diff line number Diff line
@@ -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);

kernel/torture.c

+104 −64
Original line number Diff line number Diff line
@@ -82,37 +82,26 @@ static int min_online = -1; 
static int max_online;



/*

 * Execute random CPU-hotplug operations at the interval specified

 * by the onoff_interval.

 * 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.

 */

static int

torture_onoff(void *arg)

bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,

		     unsigned long *sum_offl, int *min_offl, int *max_offl)

{

	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 (!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_offline_attempts++;

	(*n_offl_attempts)++;

	ret = cpu_down(cpu);

	if (ret) {

		if (verbose)
@@ -124,25 +113,44 @@ torture_onoff(void *arg) 
			pr_alert("%s" TORTURE_FLAG

				 "torture_onoff task: offlined %d\n",

				 torture_type, cpu);

				n_offline_successes++;

		(*n_offl_successes)++;

		delta = jiffies - starttime;

				sum_offline += delta;

				if (min_offline < 0) {

					min_offline = delta;

					max_offline = delta;

		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;

	}

				if (min_offline > delta)

					min_offline = delta;

				if (max_offline < delta)

					max_offline = delta;



	return true;

}

		} else if (cpu_is_hotpluggable(cpu)) {

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_online_attempts++;

	(*n_onl_attempts)++;

	ret = cpu_up(cpu);

	if (ret) {

		if (verbose)
@@ -154,19 +162,51 @@ torture_onoff(void *arg) 
			pr_alert("%s" TORTURE_FLAG

				 "torture_onoff task: onlined %d\n",

				 torture_type, cpu);

				n_online_successes++;

		(*n_onl_successes)++;

		delta = jiffies - starttime;

				sum_online += delta;

				if (min_online < 0) {

					min_online = delta;

					max_online = delta;

		*sum_onl += delta;

		if (*min_onl < 0) {

			*min_onl = delta;

			*max_onl = delta;

		}

				if (min_online > delta)

					min_online = delta;

				if (max_online < delta)

					max_online = 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.

 */

static int

torture_onoff(void *arg)

{

	int cpu;

	int maxcpu = -1;

	DEFINE_TORTURE_RANDOM(rand);



	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 (!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");