[urcu.git] / tests / rcutorture.h

/*
 * rcutorture.h: simple user-level performance/stress test of RCU.
 *
 * Usage:
 * 	./rcu <nreaders> rperf [ <cpustride> ]
 * 		Run a read-side performance test with the specified
 * 		number of readers spaced by <cpustride>.
 * 		Thus "./rcu 16 rperf 2" would run 16 readers on even-numbered
 * 		CPUs from 0 to 30.
 * 	./rcu <nupdaters> uperf [ <cpustride> ]
 * 		Run an update-side performance test with the specified
 * 		number of updaters and specified CPU spacing.
 * 	./rcu <nreaders> perf [ <cpustride> ]
 * 		Run a combined read/update performance test with the specified
 * 		number of readers and one updater and specified CPU spacing.
 * 		The readers run on the low-numbered CPUs and the updater
 * 		of the highest-numbered CPU.
 *
 * The above tests produce output as follows:
 *
 * n_reads: 46008000  n_updates: 146026  nreaders: 2  nupdaters: 1 duration: 1
 * ns/read: 43.4707  ns/update: 6848.1
 *
 * The first line lists the total number of RCU reads and updates executed
 * during the test, the number of reader threads, the number of updater
 * threads, and the duration of the test in seconds.  The second line
 * lists the average duration of each type of operation in nanoseconds,
 * or "nan" if the corresponding type of operation was not performed.
 *
 * 	./rcu <nreaders> stress
 * 		Run a stress test with the specified number of readers and
 * 		one updater.  None of the threads are affinitied to any
 * 		particular CPU.
 *
 * This test produces output as follows:
 *
 * n_reads: 114633217  n_updates: 3903415  n_mberror: 0
 * rcu_stress_count: 114618391 14826 0 0 0 0 0 0 0 0 0
 *
 * The first line lists the number of RCU read and update operations
 * executed, followed by the number of memory-ordering violations
 * (which will be zero in a correct RCU implementation).  The second
 * line lists the number of readers observing progressively more stale
 * data.  A correct RCU implementation will have all but the first two
 * numbers non-zero.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (c) 2008 Paul E. McKenney, IBM Corporation.
 */

/*
 * Test variables.
 */

DEFINE_PER_THREAD(long long, n_reads_pt);
DEFINE_PER_THREAD(long long, n_updates_pt);

long long n_reads = 0LL;
long n_updates = 0L;
int nthreadsrunning;
char argsbuf[64];

#define GOFLAG_INIT 0
#define GOFLAG_RUN  1
#define GOFLAG_STOP 2

int goflag __attribute__((__aligned__(CACHE_LINE_SIZE))) = GOFLAG_INIT;

#define RCU_READ_RUN 1000

//MD
#define RCU_READ_NESTABLE

#ifdef RCU_READ_NESTABLE
#define rcu_read_lock_nest() rcu_read_lock()
#define rcu_read_unlock_nest() rcu_read_unlock()
#else /* #ifdef RCU_READ_NESTABLE */
#define rcu_read_lock_nest()
#define rcu_read_unlock_nest()
#endif /* #else #ifdef RCU_READ_NESTABLE */

#ifdef TORTURE_QSBR
#define mark_rcu_quiescent_state	rcu_quiescent_state
#define put_thread_offline		rcu_thread_offline
#define put_thread_online		rcu_thread_online
#endif

#ifndef mark_rcu_quiescent_state
#define mark_rcu_quiescent_state() do ; while (0)
#endif /* #ifdef mark_rcu_quiescent_state */

#ifndef put_thread_offline
#define put_thread_offline()		do ; while (0)
#define put_thread_online()		do ; while (0)
#define put_thread_online_delay()	do ; while (0)
#else /* #ifndef put_thread_offline */
#define put_thread_online_delay()	synchronize_rcu()
#endif /* #else #ifndef put_thread_offline */

/*
 * Performance test.
 */

void *rcu_read_perf_test(void *arg)
{
	int i;
	int me = (long)arg;
	long long n_reads_local = 0;

	rcu_register_thread();
	run_on(me);
	uatomic_inc(&nthreadsrunning);
	while (goflag == GOFLAG_INIT)
		poll(NULL, 0, 1);
	mark_rcu_quiescent_state();
	while (goflag == GOFLAG_RUN) {
		for (i = 0; i < RCU_READ_RUN; i++) {
			rcu_read_lock();
			/* rcu_read_lock_nest(); */
			/* rcu_read_unlock_nest(); */
			rcu_read_unlock();
		}
		n_reads_local += RCU_READ_RUN;
		mark_rcu_quiescent_state();
	}
	__get_thread_var(n_reads_pt) += n_reads_local;
	put_thread_offline();
	rcu_unregister_thread();

	return (NULL);
}

void *rcu_update_perf_test(void *arg)
{
	long long n_updates_local = 0;

	uatomic_inc(&nthreadsrunning);
	while (goflag == GOFLAG_INIT)
		poll(NULL, 0, 1);
	while (goflag == GOFLAG_RUN) {
		synchronize_rcu();
		n_updates_local++;
	}
	__get_thread_var(n_updates_pt) += n_updates_local;
	return NULL;
}

void perftestinit(void)
{
	init_per_thread(n_reads_pt, 0LL);
	init_per_thread(n_updates_pt, 0LL);
	uatomic_set(&nthreadsrunning, 0);
}

void perftestrun(int nthreads, int nreaders, int nupdaters)
{
	int t;
	int duration = 1;

	smp_mb();
	while (uatomic_read(&nthreadsrunning) < nthreads)
		poll(NULL, 0, 1);
	goflag = GOFLAG_RUN;
	smp_mb();
	sleep(duration);
	smp_mb();
	goflag = GOFLAG_STOP;
	smp_mb();
	wait_all_threads();
	for_each_thread(t) {
		n_reads += per_thread(n_reads_pt, t);
		n_updates += per_thread(n_updates_pt, t);
	}
	printf("n_reads: %lld  n_updates: %ld  nreaders: %d  nupdaters: %d duration: %d\n",
	       n_reads, n_updates, nreaders, nupdaters, duration);
	printf("ns/read: %g  ns/update: %g\n",
	       ((duration * 1000*1000*1000.*(double)nreaders) /
	        (double)n_reads),
	       ((duration * 1000*1000*1000.*(double)nupdaters) /
	        (double)n_updates));
	exit(0);
}

void perftest(int nreaders, int cpustride)
{
	int i;
	long arg;

	perftestinit();
	for (i = 0; i < nreaders; i++) {
		arg = (long)(i * cpustride);
		create_thread(rcu_read_perf_test, (void *)arg);
	}
	arg = (long)(i * cpustride);
	create_thread(rcu_update_perf_test, (void *)arg);
	perftestrun(i + 1, nreaders, 1);
}

void rperftest(int nreaders, int cpustride)
{
	int i;
	long arg;

	perftestinit();
	init_per_thread(n_reads_pt, 0LL);
	for (i = 0; i < nreaders; i++) {
		arg = (long)(i * cpustride);
		create_thread(rcu_read_perf_test, (void *)arg);
	}
	perftestrun(i, nreaders, 0);
}

void uperftest(int nupdaters, int cpustride)
{
	int i;
	long arg;

	perftestinit();
	init_per_thread(n_reads_pt, 0LL);
	for (i = 0; i < nupdaters; i++) {
		arg = (long)(i * cpustride);
		create_thread(rcu_update_perf_test, (void *)arg);
	}
	perftestrun(i, 0, nupdaters);
}

/*
 * Stress test.
 */

#define RCU_STRESS_PIPE_LEN 10

struct rcu_stress {
	int pipe_count;
	int mbtest;
};

struct rcu_stress rcu_stress_array[RCU_STRESS_PIPE_LEN] = { { 0 } };
struct rcu_stress *rcu_stress_current;
int rcu_stress_idx = 0;

int n_mberror = 0;
DEFINE_PER_THREAD(long long [RCU_STRESS_PIPE_LEN + 1], rcu_stress_count);

int garbage = 0;

void *rcu_read_stress_test(void *arg)
{
	int i;
	int itercnt = 0;
	struct rcu_stress *p;
	int pc;

	rcu_register_thread();
	while (goflag == GOFLAG_INIT)
		poll(NULL, 0, 1);
	mark_rcu_quiescent_state();
	while (goflag == GOFLAG_RUN) {
		rcu_read_lock();
		p = rcu_dereference(rcu_stress_current);
		if (p->mbtest == 0)
			n_mberror++;
		rcu_read_lock_nest();
		for (i = 0; i < 100; i++)
			garbage++;
		rcu_read_unlock_nest();
		pc = p->pipe_count;
		rcu_read_unlock();
		if ((pc > RCU_STRESS_PIPE_LEN) || (pc < 0))
			pc = RCU_STRESS_PIPE_LEN;
		__get_thread_var(rcu_stress_count)[pc]++;
		__get_thread_var(n_reads_pt)++;
		mark_rcu_quiescent_state();
		if ((++itercnt % 0x1000) == 0) {
			put_thread_offline();
			put_thread_online_delay();
			put_thread_online();
		}
	}
	put_thread_offline();
	rcu_unregister_thread();

	return (NULL);
}

void *rcu_update_stress_test(void *arg)
{
	int i;
	struct rcu_stress *p;

	while (goflag == GOFLAG_INIT)
		poll(NULL, 0, 1);
	while (goflag == GOFLAG_RUN) {
		i = rcu_stress_idx + 1;
		if (i >= RCU_STRESS_PIPE_LEN)
			i = 0;
		p = &rcu_stress_array[i];
		p->mbtest = 0;
		smp_mb();
		p->pipe_count = 0;
		p->mbtest = 1;
		rcu_assign_pointer(rcu_stress_current, p);
		rcu_stress_idx = i;
		for (i = 0; i < RCU_STRESS_PIPE_LEN; i++)
			if (i != rcu_stress_idx)
				rcu_stress_array[i].pipe_count++;
		synchronize_rcu();
		n_updates++;
	}
	return NULL;
}

void *rcu_fake_update_stress_test(void *arg)
{
	while (goflag == GOFLAG_INIT)
		poll(NULL, 0, 1);
	while (goflag == GOFLAG_RUN) {
		synchronize_rcu();
		poll(NULL, 0, 1);
	}
	return NULL;
}

void stresstest(int nreaders)
{
	int i;
	int t;
	long long *p;
	long long sum;

	init_per_thread(n_reads_pt, 0LL);
	for_each_thread(t) {
		p = &per_thread(rcu_stress_count,t)[0];
		for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++)
			p[i] = 0LL;
	}
	rcu_stress_current = &rcu_stress_array[0];
	rcu_stress_current->pipe_count = 0;
	rcu_stress_current->mbtest = 1;
	for (i = 0; i < nreaders; i++)
		create_thread(rcu_read_stress_test, NULL);
	create_thread(rcu_update_stress_test, NULL);
	for (i = 0; i < 5; i++)
		create_thread(rcu_fake_update_stress_test, NULL);
	smp_mb();
	goflag = GOFLAG_RUN;
	smp_mb();
	sleep(10);
	smp_mb();
	goflag = GOFLAG_STOP;
	smp_mb();
	wait_all_threads();
	for_each_thread(t)
		n_reads += per_thread(n_reads_pt, t);
	printf("n_reads: %lld  n_updates: %ld  n_mberror: %d\n",
	       n_reads, n_updates, n_mberror);
	printf("rcu_stress_count:");
	for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++) {
		sum = 0LL;
		for_each_thread(t) {
			sum += per_thread(rcu_stress_count, t)[i];
		}
		printf(" %lld", sum);
	}
	printf("\n");
	exit(0);
}

/*
 * Mainprogram.
 */

void usage(int argc, char *argv[])
{
	fprintf(stderr, "Usage: %s [nreaders [ perf | stress ] ]\n", argv[0]);
	exit(-1);
}

int main(int argc, char *argv[])
{
	int nreaders = 1;
	int cpustride = 1;

	smp_init();
	//rcu_init();

#ifdef DEBUG_YIELD
	yield_active |= YIELD_READ;
	yield_active |= YIELD_WRITE;
#endif

	if (argc > 1) {
		nreaders = strtoul(argv[1], NULL, 0);
		if (argc == 2)
			perftest(nreaders, cpustride);
		if (argc > 3)
			cpustride = strtoul(argv[3], NULL, 0);
		if (strcmp(argv[2], "perf") == 0)
			perftest(nreaders, cpustride);
		else if (strcmp(argv[2], "rperf") == 0)
			rperftest(nreaders, cpustride);
		else if (strcmp(argv[2], "uperf") == 0)
			uperftest(nreaders, cpustride);
		else if (strcmp(argv[2], "stress") == 0)
			stresstest(nreaders);
		usage(argc, argv);
	}
	perftest(nreaders, cpustride);
	return 0;
}
Commit	Line	Data
8a953620 MD	1	/*
	2	* rcutorture.h: simple user-level performance/stress test of RCU.
	3	*
	4	* Usage:
	5	* ./rcu <nreaders> rperf [ <cpustride> ]
	6	* Run a read-side performance test with the specified
	7	* number of readers spaced by <cpustride>.
	8	* Thus "./rcu 16 rperf 2" would run 16 readers on even-numbered
	9	* CPUs from 0 to 30.
	10	* ./rcu <nupdaters> uperf [ <cpustride> ]
	11	* Run an update-side performance test with the specified
	12	* number of updaters and specified CPU spacing.
	13	* ./rcu <nreaders> perf [ <cpustride> ]
	14	* Run a combined read/update performance test with the specified
	15	* number of readers and one updater and specified CPU spacing.
	16	* The readers run on the low-numbered CPUs and the updater
	17	* of the highest-numbered CPU.
	18	*
	19	* The above tests produce output as follows:
	20	*
	21	* n_reads: 46008000 n_updates: 146026 nreaders: 2 nupdaters: 1 duration: 1
	22	* ns/read: 43.4707 ns/update: 6848.1
	23	*
	24	* The first line lists the total number of RCU reads and updates executed
	25	* during the test, the number of reader threads, the number of updater
	26	* threads, and the duration of the test in seconds. The second line
	27	* lists the average duration of each type of operation in nanoseconds,
	28	* or "nan" if the corresponding type of operation was not performed.
	29	*
	30	* ./rcu <nreaders> stress
	31	* Run a stress test with the specified number of readers and
	32	* one updater. None of the threads are affinitied to any
	33	* particular CPU.
	34	*
	35	* This test produces output as follows:
	36	*
	37	* n_reads: 114633217 n_updates: 3903415 n_mberror: 0
	38	* rcu_stress_count: 114618391 14826 0 0 0 0 0 0 0 0 0
	39	*
	40	* The first line lists the number of RCU read and update operations
	41	* executed, followed by the number of memory-ordering violations
	42	* (which will be zero in a correct RCU implementation). The second
	43	* line lists the number of readers observing progressively more stale
	44	* data. A correct RCU implementation will have all but the first two
	45	* numbers non-zero.
	46	*
	47	* This program is free software; you can redistribute it and/or modify
	48	* it under the terms of the GNU General Public License as published by
	49	* the Free Software Foundation; either version 2 of the License, or
	50	* (at your option) any later version.
	51	*
	52	* This program is distributed in the hope that it will be useful,
	53	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	54	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	55	* GNU General Public License for more details.
	56	*
	57	* You should have received a copy of the GNU General Public License
	58	* along with this program; if not, write to the Free Software
	59	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	60	*
	61	* Copyright (c) 2008 Paul E. McKenney, IBM Corporation.
	62	*/
	63
	64	/*
65	* Test variables.
66	*/
67
68	DEFINE_PER_THREAD(long long, n_reads_pt);
69	DEFINE_PER_THREAD(long long, n_updates_pt);
70
71	long long n_reads = 0LL;
72	long n_updates = 0L;
6ee91d83	73	int nthreadsrunning;
8a953620 MD	74	char argsbuf[64];
	75
	76	#define GOFLAG_INIT 0
	77	#define GOFLAG_RUN 1
	78	#define GOFLAG_STOP 2
	79
	80	int goflag __attribute__((__aligned__(CACHE_LINE_SIZE))) = GOFLAG_INIT;
	81
	82	#define RCU_READ_RUN 1000
	83
	84	//MD
	85	#define RCU_READ_NESTABLE
	86
	87	#ifdef RCU_READ_NESTABLE
	88	#define rcu_read_lock_nest() rcu_read_lock()
	89	#define rcu_read_unlock_nest() rcu_read_unlock()
	90	#else /* #ifdef RCU_READ_NESTABLE */
	91	#define rcu_read_lock_nest()
	92	#define rcu_read_unlock_nest()
	93	#endif /* #else #ifdef RCU_READ_NESTABLE */
	94
1a43bbd8 MD	95	#ifdef TORTURE_QSBR
	96	#define mark_rcu_quiescent_state rcu_quiescent_state
	97	#define put_thread_offline rcu_thread_offline
	98	#define put_thread_online rcu_thread_online
	99	#endif
	100
8a953620 MD	101	#ifndef mark_rcu_quiescent_state
	102	#define mark_rcu_quiescent_state() do ; while (0)
	103	#endif /* #ifdef mark_rcu_quiescent_state */
	104
	105	#ifndef put_thread_offline
	106	#define put_thread_offline() do ; while (0)
	107	#define put_thread_online() do ; while (0)
	108	#define put_thread_online_delay() do ; while (0)
	109	#else /* #ifndef put_thread_offline */
	110	#define put_thread_online_delay() synchronize_rcu()
	111	#endif /* #else #ifndef put_thread_offline */
	112
	113	/*
	114	* Performance test.
	115	*/
	116
	117	void rcu_read_perf_test(void arg)
	118	{
	119	int i;
	120	int me = (long)arg;
8a953620 MD	121	long long n_reads_local = 0;
8a953620 MD	122
121a5d44	123	rcu_register_thread();
8a953620	124	run_on(me);
ec4e58a3	125	uatomic_inc(&nthreadsrunning);
8a953620 MD	126	while (goflag == GOFLAG_INIT)
	127	poll(NULL, 0, 1);
	128	mark_rcu_quiescent_state();
	129	while (goflag == GOFLAG_RUN) {
	130	for (i = 0; i < RCU_READ_RUN; i++) {
	131	rcu_read_lock();
	132	/* rcu_read_lock_nest(); */
	133	/* rcu_read_unlock_nest(); */
	134	rcu_read_unlock();
	135	}
	136	n_reads_local += RCU_READ_RUN;
	137	mark_rcu_quiescent_state();
	138	}
	139	__get_thread_var(n_reads_pt) += n_reads_local;
	140	put_thread_offline();
121a5d44	141	rcu_unregister_thread();
8a953620 MD	142
	143	return (NULL);
	144	}
	145
	146	void rcu_update_perf_test(void arg)
	147	{
	148	long long n_updates_local = 0;
	149
ec4e58a3	150	uatomic_inc(&nthreadsrunning);
8a953620 MD	151	while (goflag == GOFLAG_INIT)
	152	poll(NULL, 0, 1);
	153	while (goflag == GOFLAG_RUN) {
	154	synchronize_rcu();
	155	n_updates_local++;
	156	}
	157	__get_thread_var(n_updates_pt) += n_updates_local;
b0b31506	158	return NULL;
8a953620 MD	159	}
	160
	161	void perftestinit(void)
	162	{
	163	init_per_thread(n_reads_pt, 0LL);
	164	init_per_thread(n_updates_pt, 0LL);
ec4e58a3	165	uatomic_set(&nthreadsrunning, 0);
8a953620 MD	166	}
	167
	168	void perftestrun(int nthreads, int nreaders, int nupdaters)
	169	{
	170	int t;
	171	int duration = 1;
	172
	173	smp_mb();
ec4e58a3	174	while (uatomic_read(&nthreadsrunning) < nthreads)
8a953620 MD	175	poll(NULL, 0, 1);
	176	goflag = GOFLAG_RUN;
	177	smp_mb();
	178	sleep(duration);
	179	smp_mb();
	180	goflag = GOFLAG_STOP;
	181	smp_mb();
	182	wait_all_threads();
	183	for_each_thread(t) {
	184	n_reads += per_thread(n_reads_pt, t);
	185	n_updates += per_thread(n_updates_pt, t);
	186	}
	187	printf("n_reads: %lld n_updates: %ld nreaders: %d nupdaters: %d duration: %d\n",
	188	n_reads, n_updates, nreaders, nupdaters, duration);
	189	printf("ns/read: %g ns/update: %g\n",
	190	((duration * 100010001000.*(double)nreaders) /
	191	(double)n_reads),
	192	((duration * 100010001000.*(double)nupdaters) /
	193	(double)n_updates));
	194	exit(0);
	195	}
	196
	197	void perftest(int nreaders, int cpustride)
	198	{
	199	int i;
	200	long arg;
	201
	202	perftestinit();
	203	for (i = 0; i < nreaders; i++) {
	204	arg = (long)(i * cpustride);
	205	create_thread(rcu_read_perf_test, (void *)arg);
	206	}
	207	arg = (long)(i * cpustride);
	208	create_thread(rcu_update_perf_test, (void *)arg);
	209	perftestrun(i + 1, nreaders, 1);
	210	}
	211
	212	void rperftest(int nreaders, int cpustride)
	213	{
	214	int i;
	215	long arg;
	216
	217	perftestinit();
	218	init_per_thread(n_reads_pt, 0LL);
	219	for (i = 0; i < nreaders; i++) {
	220	arg = (long)(i * cpustride);
	221	create_thread(rcu_read_perf_test, (void *)arg);
	222	}
	223	perftestrun(i, nreaders, 0);
	224	}
	225
	226	void uperftest(int nupdaters, int cpustride)
	227	{
	228	int i;
	229	long arg;
	230
	231	perftestinit();
	232	init_per_thread(n_reads_pt, 0LL);
	233	for (i = 0; i < nupdaters; i++) {
	234	arg = (long)(i * cpustride);
	235	create_thread(rcu_update_perf_test, (void *)arg);
	236	}
	237	perftestrun(i, 0, nupdaters);
	238	}
239
240	/*
241	* Stress test.
242	*/
243
244	#define RCU_STRESS_PIPE_LEN 10
245
246	struct rcu_stress {
247	int pipe_count;
248	int mbtest;
249	};
250
b0b31506	251	struct rcu_stress rcu_stress_array[RCU_STRESS_PIPE_LEN] = { { 0 } };
8a953620 MD	252	struct rcu_stress *rcu_stress_current;
	253	int rcu_stress_idx = 0;
	254
	255	int n_mberror = 0;
	256	DEFINE_PER_THREAD(long long [RCU_STRESS_PIPE_LEN + 1], rcu_stress_count);
	257
	258	int garbage = 0;
	259
	260	void rcu_read_stress_test(void arg)
	261	{
	262	int i;
	263	int itercnt = 0;
	264	struct rcu_stress *p;
	265	int pc;
	266
121a5d44	267	rcu_register_thread();
8a953620 MD	268	while (goflag == GOFLAG_INIT)
	269	poll(NULL, 0, 1);
	270	mark_rcu_quiescent_state();
	271	while (goflag == GOFLAG_RUN) {
	272	rcu_read_lock();
	273	p = rcu_dereference(rcu_stress_current);
	274	if (p->mbtest == 0)
	275	n_mberror++;
	276	rcu_read_lock_nest();
	277	for (i = 0; i < 100; i++)
	278	garbage++;
	279	rcu_read_unlock_nest();
	280	pc = p->pipe_count;
	281	rcu_read_unlock();
	282	if ((pc > RCU_STRESS_PIPE_LEN) \|\| (pc < 0))
	283	pc = RCU_STRESS_PIPE_LEN;
	284	__get_thread_var(rcu_stress_count)[pc]++;
	285	__get_thread_var(n_reads_pt)++;
	286	mark_rcu_quiescent_state();
	287	if ((++itercnt % 0x1000) == 0) {
	288	put_thread_offline();
	289	put_thread_online_delay();
	290	put_thread_online();
	291	}
	292	}
	293	put_thread_offline();
121a5d44	294	rcu_unregister_thread();
8a953620 MD	295
	296	return (NULL);
	297	}
	298
	299	void rcu_update_stress_test(void arg)
	300	{
	301	int i;
	302	struct rcu_stress *p;
	303
	304	while (goflag == GOFLAG_INIT)
	305	poll(NULL, 0, 1);
	306	while (goflag == GOFLAG_RUN) {
	307	i = rcu_stress_idx + 1;
	308	if (i >= RCU_STRESS_PIPE_LEN)
	309	i = 0;
	310	p = &rcu_stress_array[i];
	311	p->mbtest = 0;
	312	smp_mb();
	313	p->pipe_count = 0;
	314	p->mbtest = 1;
	315	rcu_assign_pointer(rcu_stress_current, p);
	316	rcu_stress_idx = i;
	317	for (i = 0; i < RCU_STRESS_PIPE_LEN; i++)
	318	if (i != rcu_stress_idx)
	319	rcu_stress_array[i].pipe_count++;
	320	synchronize_rcu();
	321	n_updates++;
	322	}
b0b31506	323	return NULL;
8a953620 MD	324	}
	325
	326	void rcu_fake_update_stress_test(void arg)
	327	{
8a953620 MD	328	while (goflag == GOFLAG_INIT)
	329	poll(NULL, 0, 1);
	330	while (goflag == GOFLAG_RUN) {
	331	synchronize_rcu();
	332	poll(NULL, 0, 1);
	333	}
b0b31506	334	return NULL;
8a953620 MD	335	}
	336
	337	void stresstest(int nreaders)
	338	{
	339	int i;
	340	int t;
	341	long long *p;
	342	long long sum;
	343
	344	init_per_thread(n_reads_pt, 0LL);
	345	for_each_thread(t) {
	346	p = &per_thread(rcu_stress_count,t)[0];
	347	for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++)
	348	p[i] = 0LL;
	349	}
	350	rcu_stress_current = &rcu_stress_array[0];
	351	rcu_stress_current->pipe_count = 0;
	352	rcu_stress_current->mbtest = 1;
	353	for (i = 0; i < nreaders; i++)
	354	create_thread(rcu_read_stress_test, NULL);
	355	create_thread(rcu_update_stress_test, NULL);
	356	for (i = 0; i < 5; i++)
	357	create_thread(rcu_fake_update_stress_test, NULL);
	358	smp_mb();
	359	goflag = GOFLAG_RUN;
	360	smp_mb();
	361	sleep(10);
	362	smp_mb();
	363	goflag = GOFLAG_STOP;
	364	smp_mb();
	365	wait_all_threads();
	366	for_each_thread(t)
	367	n_reads += per_thread(n_reads_pt, t);
b0b31506	368	printf("n_reads: %lld n_updates: %ld n_mberror: %d\n",
8a953620 MD	369	n_reads, n_updates, n_mberror);
	370	printf("rcu_stress_count:");
	371	for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++) {
	372	sum = 0LL;
	373	for_each_thread(t) {
	374	sum += per_thread(rcu_stress_count, t)[i];
	375	}
	376	printf(" %lld", sum);
	377	}
	378	printf("\n");
	379	exit(0);
	380	}
	381
	382	/*
	383	* Mainprogram.
	384	*/
	385
	386	void usage(int argc, char *argv[])
	387	{
	388	fprintf(stderr, "Usage: %s [nreaders [ perf \| stress ] ]\n", argv[0]);
	389	exit(-1);
	390	}
	391
	392	int main(int argc, char *argv[])
	393	{
	394	int nreaders = 1;
	395	int cpustride = 1;
	396
	397	smp_init();
	398	//rcu_init();
	399
9b171f46 MD	400	#ifdef DEBUG_YIELD
	401	yield_active \|= YIELD_READ;
	402	yield_active \|= YIELD_WRITE;
	403	#endif
	404
8a953620 MD	405	if (argc > 1) {
	406	nreaders = strtoul(argv[1], NULL, 0);
	407	if (argc == 2)
	408	perftest(nreaders, cpustride);
	409	if (argc > 3)
	410	cpustride = strtoul(argv[3], NULL, 0);
	411	if (strcmp(argv[2], "perf") == 0)
	412	perftest(nreaders, cpustride);
	413	else if (strcmp(argv[2], "rperf") == 0)
	414	rperftest(nreaders, cpustride);
	415	else if (strcmp(argv[2], "uperf") == 0)
	416	uperftest(nreaders, cpustride);
	417	else if (strcmp(argv[2], "stress") == 0)
	418	stresstest(nreaders);
	419	usage(argc, argv);
	420	}
	421	perftest(nreaders, cpustride);
0578089f	422	return 0;
8a953620	423	}