[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.
 */

#include <stdlib.h>
#include "../urcu-call-rcu.h"

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__(CAA_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;

	if ((random() & 0xf00) == 0) {
		struct call_rcu_data *crdp;

		crdp = create_call_rcu_data(0);
		if (crdp != NULL) {
			fprintf(stderr,
				"Using per-thread call_rcu() worker.\n");
			set_thread_call_rcu_data(crdp);
		}
	}
	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;

	cmm_smp_mb();
	while (uatomic_read(&nthreadsrunning) < nthreads)
		poll(NULL, 0, 1);
	goflag = GOFLAG_RUN;
	cmm_smp_mb();
	sleep(duration);
	cmm_smp_mb();
	goflag = GOFLAG_STOP;
	cmm_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);
}

static pthread_mutex_t call_rcu_test_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t call_rcu_test_cond = PTHREAD_COND_INITIALIZER;

void rcu_update_stress_test_rcu(struct rcu_head *head)
{
	if (pthread_mutex_lock(&call_rcu_test_mutex) != 0) {
		perror("pthread_mutex_lock");
		exit(-1);
	}
	if (pthread_cond_signal(&call_rcu_test_cond) != 0) {
		perror("pthread_cond_signal");
		exit(-1);
	}
	if (pthread_mutex_unlock(&call_rcu_test_mutex) != 0) {
		perror("pthread_mutex_unlock");
		exit(-1);
	}
}

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

	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;
		cmm_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++;
		if (n_updates & 0x1)
			synchronize_rcu();
		else {
			if (pthread_mutex_lock(&call_rcu_test_mutex) != 0) {
				perror("pthread_mutex_lock");
				exit(-1);
			}
			call_rcu(&rh, rcu_update_stress_test_rcu);
			if (pthread_cond_wait(&call_rcu_test_cond,
					      &call_rcu_test_mutex) != 0) {
				perror("pthread_cond_wait");
				exit(-1);
			}
			if (pthread_mutex_unlock(&call_rcu_test_mutex) != 0) {
				perror("pthread_mutex_unlock");
				exit(-1);
			}
		}
		n_updates++;
	}
	return NULL;
}

void *rcu_fake_update_stress_test(void *arg)
{
	if ((random() & 0xf00) == 0) {
		struct call_rcu_data *crdp;

		crdp = create_call_rcu_data(0);
		if (crdp != NULL) {
			fprintf(stderr,
				"Using per-thread call_rcu() worker.\n");
			set_thread_call_rcu_data(crdp);
		}
	}
	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);
	cmm_smp_mb();
	goflag = GOFLAG_RUN;
	cmm_smp_mb();
	sleep(10);
	cmm_smp_mb();
	goflag = GOFLAG_STOP;
	cmm_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();
	srandom(time(NULL));
	if (random() & 0x100) {
		fprintf(stderr, "Allocating per-CPU call_rcu threads.\n");
		if (create_all_cpu_call_rcu_data(0))
			perror("create_all_cpu_call_rcu_data");
	}

#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
b57aee66 PM	68	#include <stdlib.h>
	69	#include "../urcu-call-rcu.h"
	70
8a953620 MD	71	DEFINE_PER_THREAD(long long, n_reads_pt);
	72	DEFINE_PER_THREAD(long long, n_updates_pt);
	73
	74	long long n_reads = 0LL;
	75	long n_updates = 0L;
6ee91d83	76	int nthreadsrunning;
8a953620 MD	77	char argsbuf[64];
	78
	79	#define GOFLAG_INIT 0
	80	#define GOFLAG_RUN 1
	81	#define GOFLAG_STOP 2
	82
06f22bdb	83	int goflag __attribute__((__aligned__(CAA_CACHE_LINE_SIZE))) = GOFLAG_INIT;
8a953620 MD	84
	85	#define RCU_READ_RUN 1000
	86
	87	//MD
	88	#define RCU_READ_NESTABLE
	89
	90	#ifdef RCU_READ_NESTABLE
	91	#define rcu_read_lock_nest() rcu_read_lock()
	92	#define rcu_read_unlock_nest() rcu_read_unlock()
	93	#else /* #ifdef RCU_READ_NESTABLE */
	94	#define rcu_read_lock_nest()
	95	#define rcu_read_unlock_nest()
	96	#endif /* #else #ifdef RCU_READ_NESTABLE */
	97
1a43bbd8 MD	98	#ifdef TORTURE_QSBR
	99	#define mark_rcu_quiescent_state rcu_quiescent_state
	100	#define put_thread_offline rcu_thread_offline
	101	#define put_thread_online rcu_thread_online
	102	#endif
	103
8a953620 MD	104	#ifndef mark_rcu_quiescent_state
	105	#define mark_rcu_quiescent_state() do ; while (0)
	106	#endif /* #ifdef mark_rcu_quiescent_state */
	107
	108	#ifndef put_thread_offline
	109	#define put_thread_offline() do ; while (0)
	110	#define put_thread_online() do ; while (0)
	111	#define put_thread_online_delay() do ; while (0)
	112	#else /* #ifndef put_thread_offline */
	113	#define put_thread_online_delay() synchronize_rcu()
	114	#endif /* #else #ifndef put_thread_offline */
	115
	116	/*
	117	* Performance test.
	118	*/
	119
	120	void rcu_read_perf_test(void arg)
	121	{
	122	int i;
	123	int me = (long)arg;
8a953620 MD	124	long long n_reads_local = 0;
8a953620 MD	125
121a5d44	126	rcu_register_thread();
8a953620	127	run_on(me);
ec4e58a3	128	uatomic_inc(&nthreadsrunning);
8a953620 MD	129	while (goflag == GOFLAG_INIT)
	130	poll(NULL, 0, 1);
	131	mark_rcu_quiescent_state();
	132	while (goflag == GOFLAG_RUN) {
	133	for (i = 0; i < RCU_READ_RUN; i++) {
	134	rcu_read_lock();
	135	/* rcu_read_lock_nest(); */
	136	/* rcu_read_unlock_nest(); */
	137	rcu_read_unlock();
	138	}
	139	n_reads_local += RCU_READ_RUN;
	140	mark_rcu_quiescent_state();
	141	}
	142	__get_thread_var(n_reads_pt) += n_reads_local;
	143	put_thread_offline();
121a5d44	144	rcu_unregister_thread();
8a953620 MD	145
	146	return (NULL);
	147	}
	148
	149	void rcu_update_perf_test(void arg)
	150	{
	151	long long n_updates_local = 0;
	152
b57aee66 PM	153	if ((random() & 0xf00) == 0) {
	154	struct call_rcu_data *crdp;
	155
	156	crdp = create_call_rcu_data(0);
	157	if (crdp != NULL) {
	158	fprintf(stderr,
	159	"Using per-thread call_rcu() worker.\n");
	160	set_thread_call_rcu_data(crdp);
	161	}
	162	}
ec4e58a3	163	uatomic_inc(&nthreadsrunning);
8a953620 MD	164	while (goflag == GOFLAG_INIT)
	165	poll(NULL, 0, 1);
	166	while (goflag == GOFLAG_RUN) {
	167	synchronize_rcu();
	168	n_updates_local++;
	169	}
	170	__get_thread_var(n_updates_pt) += n_updates_local;
b0b31506	171	return NULL;
8a953620 MD	172	}
	173
	174	void perftestinit(void)
	175	{
	176	init_per_thread(n_reads_pt, 0LL);
	177	init_per_thread(n_updates_pt, 0LL);
ec4e58a3	178	uatomic_set(&nthreadsrunning, 0);
8a953620 MD	179	}
	180
	181	void perftestrun(int nthreads, int nreaders, int nupdaters)
	182	{
	183	int t;
	184	int duration = 1;
	185
5481ddb3	186	cmm_smp_mb();
ec4e58a3	187	while (uatomic_read(&nthreadsrunning) < nthreads)
8a953620 MD	188	poll(NULL, 0, 1);
8a953620 MD	189	goflag = GOFLAG_RUN;
5481ddb3	190	cmm_smp_mb();
8a953620	191	sleep(duration);
5481ddb3	192	cmm_smp_mb();
8a953620	193	goflag = GOFLAG_STOP;
5481ddb3	194	cmm_smp_mb();
8a953620 MD	195	wait_all_threads();
	196	for_each_thread(t) {
	197	n_reads += per_thread(n_reads_pt, t);
	198	n_updates += per_thread(n_updates_pt, t);
	199	}
	200	printf("n_reads: %lld n_updates: %ld nreaders: %d nupdaters: %d duration: %d\n",
	201	n_reads, n_updates, nreaders, nupdaters, duration);
	202	printf("ns/read: %g ns/update: %g\n",
	203	((duration * 100010001000.*(double)nreaders) /
	204	(double)n_reads),
	205	((duration * 100010001000.*(double)nupdaters) /
	206	(double)n_updates));
	207	exit(0);
	208	}
	209
	210	void perftest(int nreaders, int cpustride)
	211	{
	212	int i;
	213	long arg;
	214
	215	perftestinit();
	216	for (i = 0; i < nreaders; i++) {
	217	arg = (long)(i * cpustride);
	218	create_thread(rcu_read_perf_test, (void *)arg);
	219	}
	220	arg = (long)(i * cpustride);
	221	create_thread(rcu_update_perf_test, (void *)arg);
	222	perftestrun(i + 1, nreaders, 1);
	223	}
	224
	225	void rperftest(int nreaders, int cpustride)
	226	{
	227	int i;
	228	long arg;
	229
	230	perftestinit();
	231	init_per_thread(n_reads_pt, 0LL);
	232	for (i = 0; i < nreaders; i++) {
	233	arg = (long)(i * cpustride);
	234	create_thread(rcu_read_perf_test, (void *)arg);
	235	}
	236	perftestrun(i, nreaders, 0);
	237	}
	238
	239	void uperftest(int nupdaters, int cpustride)
	240	{
	241	int i;
	242	long arg;
	243
	244	perftestinit();
	245	init_per_thread(n_reads_pt, 0LL);
	246	for (i = 0; i < nupdaters; i++) {
	247	arg = (long)(i * cpustride);
	248	create_thread(rcu_update_perf_test, (void *)arg);
	249	}
	250	perftestrun(i, 0, nupdaters);
	251	}
	252
	253	/*
	254	* Stress test.
	255	*/
	256
	257	#define RCU_STRESS_PIPE_LEN 10
	258
259	struct rcu_stress {
260	int pipe_count;
261	int mbtest;
262	};
263
b0b31506	264	struct rcu_stress rcu_stress_array[RCU_STRESS_PIPE_LEN] = { { 0 } };
8a953620 MD	265	struct rcu_stress *rcu_stress_current;
	266	int rcu_stress_idx = 0;
	267
	268	int n_mberror = 0;
	269	DEFINE_PER_THREAD(long long [RCU_STRESS_PIPE_LEN + 1], rcu_stress_count);
	270
	271	int garbage = 0;
	272
	273	void rcu_read_stress_test(void arg)
	274	{
	275	int i;
	276	int itercnt = 0;
	277	struct rcu_stress *p;
	278	int pc;
	279
121a5d44	280	rcu_register_thread();
8a953620 MD	281	while (goflag == GOFLAG_INIT)
	282	poll(NULL, 0, 1);
	283	mark_rcu_quiescent_state();
	284	while (goflag == GOFLAG_RUN) {
	285	rcu_read_lock();
	286	p = rcu_dereference(rcu_stress_current);
	287	if (p->mbtest == 0)
	288	n_mberror++;
	289	rcu_read_lock_nest();
	290	for (i = 0; i < 100; i++)
	291	garbage++;
	292	rcu_read_unlock_nest();
	293	pc = p->pipe_count;
	294	rcu_read_unlock();
	295	if ((pc > RCU_STRESS_PIPE_LEN) \|\| (pc < 0))
	296	pc = RCU_STRESS_PIPE_LEN;
	297	__get_thread_var(rcu_stress_count)[pc]++;
	298	__get_thread_var(n_reads_pt)++;
	299	mark_rcu_quiescent_state();
	300	if ((++itercnt % 0x1000) == 0) {
	301	put_thread_offline();
	302	put_thread_online_delay();
	303	put_thread_online();
	304	}
	305	}
	306	put_thread_offline();
121a5d44	307	rcu_unregister_thread();
8a953620 MD	308
	309	return (NULL);
	310	}
	311
b57aee66 PM	312	static pthread_mutex_t call_rcu_test_mutex = PTHREAD_MUTEX_INITIALIZER;
	313	static pthread_cond_t call_rcu_test_cond = PTHREAD_COND_INITIALIZER;
	314
	315	void rcu_update_stress_test_rcu(struct rcu_head *head)
	316	{
	317	if (pthread_mutex_lock(&call_rcu_test_mutex) != 0) {
	318	perror("pthread_mutex_lock");
	319	exit(-1);
	320	}
	321	if (pthread_cond_signal(&call_rcu_test_cond) != 0) {
	322	perror("pthread_cond_signal");
	323	exit(-1);
	324	}
	325	if (pthread_mutex_unlock(&call_rcu_test_mutex) != 0) {
	326	perror("pthread_mutex_unlock");
	327	exit(-1);
	328	}
	329	}
	330
8a953620 MD	331	void rcu_update_stress_test(void arg)
	332	{
	333	int i;
	334	struct rcu_stress *p;
b57aee66	335	struct rcu_head rh;
8a953620 MD	336
	337	while (goflag == GOFLAG_INIT)
	338	poll(NULL, 0, 1);
	339	while (goflag == GOFLAG_RUN) {
	340	i = rcu_stress_idx + 1;
	341	if (i >= RCU_STRESS_PIPE_LEN)
	342	i = 0;
	343	p = &rcu_stress_array[i];
	344	p->mbtest = 0;
5481ddb3	345	cmm_smp_mb();
8a953620 MD	346	p->pipe_count = 0;
	347	p->mbtest = 1;
	348	rcu_assign_pointer(rcu_stress_current, p);
	349	rcu_stress_idx = i;
	350	for (i = 0; i < RCU_STRESS_PIPE_LEN; i++)
	351	if (i != rcu_stress_idx)
	352	rcu_stress_array[i].pipe_count++;
b57aee66 PM	353	if (n_updates & 0x1)
	354	synchronize_rcu();
	355	else {
	356	if (pthread_mutex_lock(&call_rcu_test_mutex) != 0) {
	357	perror("pthread_mutex_lock");
	358	exit(-1);
	359	}
	360	call_rcu(&rh, rcu_update_stress_test_rcu);
	361	if (pthread_cond_wait(&call_rcu_test_cond,
	362	&call_rcu_test_mutex) != 0) {
	363	perror("pthread_cond_wait");
	364	exit(-1);
	365	}
	366	if (pthread_mutex_unlock(&call_rcu_test_mutex) != 0) {
	367	perror("pthread_mutex_unlock");
	368	exit(-1);
	369	}
	370	}
8a953620 MD	371	n_updates++;
8a953620 MD	372	}
b0b31506	373	return NULL;
8a953620 MD	374	}
	375
	376	void rcu_fake_update_stress_test(void arg)
	377	{
b57aee66 PM	378	if ((random() & 0xf00) == 0) {
	379	struct call_rcu_data *crdp;
	380
	381	crdp = create_call_rcu_data(0);
	382	if (crdp != NULL) {
	383	fprintf(stderr,
	384	"Using per-thread call_rcu() worker.\n");
	385	set_thread_call_rcu_data(crdp);
	386	}
	387	}
8a953620 MD	388	while (goflag == GOFLAG_INIT)
	389	poll(NULL, 0, 1);
	390	while (goflag == GOFLAG_RUN) {
	391	synchronize_rcu();
	392	poll(NULL, 0, 1);
	393	}
b0b31506	394	return NULL;
8a953620 MD	395	}
	396
	397	void stresstest(int nreaders)
	398	{
	399	int i;
	400	int t;
	401	long long *p;
	402	long long sum;
	403
	404	init_per_thread(n_reads_pt, 0LL);
	405	for_each_thread(t) {
	406	p = &per_thread(rcu_stress_count,t)[0];
	407	for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++)
	408	p[i] = 0LL;
	409	}
	410	rcu_stress_current = &rcu_stress_array[0];
	411	rcu_stress_current->pipe_count = 0;
	412	rcu_stress_current->mbtest = 1;
	413	for (i = 0; i < nreaders; i++)
	414	create_thread(rcu_read_stress_test, NULL);
	415	create_thread(rcu_update_stress_test, NULL);
	416	for (i = 0; i < 5; i++)
	417	create_thread(rcu_fake_update_stress_test, NULL);
5481ddb3	418	cmm_smp_mb();
8a953620	419	goflag = GOFLAG_RUN;
5481ddb3	420	cmm_smp_mb();
8a953620	421	sleep(10);
5481ddb3	422	cmm_smp_mb();
8a953620	423	goflag = GOFLAG_STOP;
5481ddb3	424	cmm_smp_mb();
8a953620 MD	425	wait_all_threads();
	426	for_each_thread(t)
	427	n_reads += per_thread(n_reads_pt, t);
b0b31506	428	printf("n_reads: %lld n_updates: %ld n_mberror: %d\n",
8a953620 MD	429	n_reads, n_updates, n_mberror);
	430	printf("rcu_stress_count:");
	431	for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++) {
	432	sum = 0LL;
	433	for_each_thread(t) {
	434	sum += per_thread(rcu_stress_count, t)[i];
	435	}
	436	printf(" %lld", sum);
	437	}
	438	printf("\n");
	439	exit(0);
	440	}
	441
	442	/*
	443	* Mainprogram.
	444	*/
	445
	446	void usage(int argc, char *argv[])
	447	{
	448	fprintf(stderr, "Usage: %s [nreaders [ perf \| stress ] ]\n", argv[0]);
	449	exit(-1);
	450	}
	451
	452	int main(int argc, char *argv[])
	453	{
	454	int nreaders = 1;
	455	int cpustride = 1;
	456
	457	smp_init();
	458	//rcu_init();
b57aee66 PM	459	srandom(time(NULL));
	460	if (random() & 0x100) {
	461	fprintf(stderr, "Allocating per-CPU call_rcu threads.\n");
	462	if (create_all_cpu_call_rcu_data(0))
	463	perror("create_all_cpu_call_rcu_data");
	464	}
8a953620	465
9b171f46 MD	466	#ifdef DEBUG_YIELD
	467	yield_active \|= YIELD_READ;
	468	yield_active \|= YIELD_WRITE;
	469	#endif
	470
8a953620 MD	471	if (argc > 1) {
	472	nreaders = strtoul(argv[1], NULL, 0);
	473	if (argc == 2)
	474	perftest(nreaders, cpustride);
	475	if (argc > 3)
	476	cpustride = strtoul(argv[3], NULL, 0);
	477	if (strcmp(argv[2], "perf") == 0)
	478	perftest(nreaders, cpustride);
	479	else if (strcmp(argv[2], "rperf") == 0)
	480	rperftest(nreaders, cpustride);
	481	else if (strcmp(argv[2], "uperf") == 0)
	482	uperftest(nreaders, cpustride);
	483	else if (strcmp(argv[2], "stress") == 0)
	484	stresstest(nreaders);
	485	usage(argc, argv);
	486	}
	487	perftest(nreaders, cpustride);
0578089f	488	return 0;
8a953620	489	}