4 * Userspace RCU library - test program (with baatch reclamation)
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
28 #include <sys/types.h>
33 #include <sys/syscall.h>
38 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
39 #define CACHE_LINE_SIZE 4096
41 /* hardcoded number of CPUs */
44 #if defined(_syscall0)
45 _syscall0(pid_t
, gettid
)
46 #elif defined(__NR_gettid)
47 static inline pid_t
gettid(void)
49 return syscall(__NR_gettid
);
52 #warning "use pid as tid"
53 static inline pid_t
gettid(void)
59 #ifndef DYNAMIC_LINK_TEST
62 #define debug_yield_read()
70 static volatile int test_go
, test_stop
;
72 static unsigned long wdelay
;
74 static struct test_array
*test_rcu_pointer
;
76 static unsigned int reclaim_batch
= 1;
78 struct reclaim_queue
{
79 void **queue
; /* Beginning of queue */
80 void **head
; /* Insert position */
83 static struct reclaim_queue
*pending_reclaims
;
85 static unsigned long duration
;
87 /* read-side C.S. duration, in loops */
88 static unsigned long rduration
;
90 static inline void loop_sleep(unsigned long l
)
96 static int verbose_mode
;
98 #define printf_verbose(fmt, args...) \
104 static unsigned int cpu_affinities
[NR_CPUS
];
105 static unsigned int next_aff
= 0;
106 static int use_affinity
= 0;
108 static void set_affinity(void)
116 cpu
= cpu_affinities
[next_aff
++];
119 sched_setaffinity(0, sizeof(mask
), &mask
);
125 * returns 0 if test should end.
127 static int test_duration_write(void)
132 static int test_duration_read(void)
137 static unsigned long long __thread nr_writes
;
138 static unsigned long long __thread nr_reads
;
141 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
143 static unsigned int nr_readers
;
144 static unsigned int nr_writers
;
146 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
148 void rcu_copy_mutex_lock(void)
151 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
153 perror("Error in pthread mutex lock");
158 void rcu_copy_mutex_unlock(void)
162 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
164 perror("Error in pthread mutex unlock");
169 void *thr_reader(void *_count
)
171 unsigned long long *count
= _count
;
172 struct test_array
*local_ptr
;
174 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
175 "reader", pthread_self(), (unsigned long)gettid());
179 rcu_register_thread();
188 local_ptr
= rcu_dereference(test_rcu_pointer
);
191 assert(local_ptr
->a
== 8);
192 if (unlikely(rduration
))
193 loop_sleep(rduration
);
196 if (unlikely(!test_duration_read()))
200 rcu_unregister_thread();
203 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
204 "reader", pthread_self(), (unsigned long)gettid());
209 static void rcu_gc_clear_queue(unsigned long wtidx
)
213 /* Wait for Q.S and empty queue */
216 for (p
= pending_reclaims
[wtidx
].queue
;
217 p
< pending_reclaims
[wtidx
].head
; p
++) {
220 ((struct test_array
*)*p
)->a
= 0;
223 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
226 /* Using per-thread queue */
227 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
230 *pending_reclaims
[wtidx
].head
= old
;
231 pending_reclaims
[wtidx
].head
++;
233 if (likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
237 rcu_gc_clear_queue(wtidx
);
240 void *thr_writer(void *data
)
242 unsigned long wtidx
= (unsigned long)data
;
243 struct test_array
*new, *old
;
245 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
246 "writer", pthread_self(), (unsigned long)gettid());
256 new = malloc(sizeof(*new));
257 rcu_copy_mutex_lock();
258 old
= test_rcu_pointer
;
262 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
263 rcu_copy_mutex_unlock();
264 rcu_gc_reclaim(wtidx
, old
);
266 if (unlikely(!test_duration_write()))
268 if (unlikely(wdelay
))
272 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
273 "writer", pthread_self(), (unsigned long)gettid());
274 tot_nr_writes
[wtidx
] = nr_writes
;
278 void show_usage(int argc
, char **argv
)
280 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
282 printf(" [-r] [-w] (yield reader and/or writer)");
284 printf(" [-d delay] (writer period (us))");
285 printf(" [-c duration] (reader C.S. duration (in loops))");
286 printf(" [-v] (verbose output)");
287 printf(" [-a cpu#] [-a cpu#]... (affinity)");
291 int main(int argc
, char **argv
)
294 pthread_t
*tid_reader
, *tid_writer
;
296 unsigned long long *count_reader
;
297 unsigned long long tot_reads
= 0, tot_writes
= 0;
301 show_usage(argc
, argv
);
305 err
= sscanf(argv
[1], "%u", &nr_readers
);
307 show_usage(argc
, argv
);
311 err
= sscanf(argv
[2], "%u", &nr_writers
);
313 show_usage(argc
, argv
);
317 err
= sscanf(argv
[3], "%lu", &duration
);
319 show_usage(argc
, argv
);
323 for (i
= 4; i
< argc
; i
++) {
324 if (argv
[i
][0] != '-')
326 switch (argv
[i
][1]) {
329 yield_active
|= YIELD_READ
;
332 yield_active
|= YIELD_WRITE
;
337 show_usage(argc
, argv
);
341 cpu_affinities
[next_aff
++] = a
;
343 printf_verbose("Adding CPU %d affinity\n", a
);
347 show_usage(argc
, argv
);
350 reclaim_batch
= atol(argv
[++i
]);
354 show_usage(argc
, argv
);
357 rduration
= atol(argv
[++i
]);
361 show_usage(argc
, argv
);
364 wdelay
= atol(argv
[++i
]);
372 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
373 duration
, nr_readers
, nr_writers
);
374 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
375 printf_verbose("Reader duration : %lu loops.\n", rduration
);
376 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
377 "main", pthread_self(), (unsigned long)gettid());
379 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
380 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
381 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
382 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
383 pending_reclaims
= malloc(sizeof(*pending_reclaims
) * nr_writers
);
384 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
386 for (i
= 0; i
< nr_writers
; i
++)
387 pending_reclaims
[i
].queue
= calloc(1, CACHE_LINE_SIZE
);
389 for (i
= 0; i
< nr_writers
; i
++)
390 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
391 sizeof(*pending_reclaims
[i
].queue
));
392 for (i
= 0; i
< nr_writers
; i
++)
393 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
397 for (i
= 0; i
< nr_readers
; i
++) {
398 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
403 for (i
= 0; i
< nr_writers
; i
++) {
404 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
418 for (i
= 0; i
< nr_readers
; i
++) {
419 err
= pthread_join(tid_reader
[i
], &tret
);
422 tot_reads
+= count_reader
[i
];
424 for (i
= 0; i
< nr_writers
; i
++) {
425 err
= pthread_join(tid_writer
[i
], &tret
);
428 tot_writes
+= tot_nr_writes
[i
];
429 rcu_gc_clear_queue(i
);
432 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
434 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
436 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
438 argv
[0], duration
, nr_readers
, rduration
,
439 nr_writers
, wdelay
, tot_reads
, tot_writes
,
440 tot_reads
+ tot_writes
, reclaim_batch
);
445 for (i
= 0; i
< nr_writers
; i
++)
446 free(pending_reclaims
[i
].queue
);
447 free(pending_reclaims
);