/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
#define CACHE_LINE_SIZE 4096
+/* hardcoded number of CPUs */
+#define NR_CPUS 16384
+
#if defined(_syscall0)
_syscall0(pid_t, gettid)
#elif defined(__NR_gettid)
static struct test_array *test_rcu_pointer;
-static int reclaim_batch = 1;
+static unsigned int reclaim_batch = 1;
struct reclaim_queue {
void **queue; /* Beginning of queue */
printf(fmt, args); \
} while (0)
+static unsigned int cpu_affinities[NR_CPUS];
+static unsigned int next_aff = 0;
+static int use_affinity = 0;
+
+pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static void set_affinity(void)
+{
+ cpu_set_t mask;
+ int cpu;
+ int ret;
+
+ if (!use_affinity)
+ return;
+
+ ret = pthread_mutex_lock(&affinity_mutex);
+ if (ret) {
+ perror("Error in pthread mutex lock");
+ exit(-1);
+ }
+ cpu = cpu_affinities[next_aff++];
+ ret = pthread_mutex_unlock(&affinity_mutex);
+ if (ret) {
+ perror("Error in pthread mutex unlock");
+ exit(-1);
+ }
+ CPU_ZERO(&mask);
+ CPU_SET(cpu, &mask);
+ sched_setaffinity(0, sizeof(mask), &mask);
+}
+
/*
* returns 0 if test should end.
*/
printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
"reader", pthread_self(), (unsigned long)gettid());
+ set_affinity();
+
rcu_register_thread();
while (!test_go)
}
-/* Using per-thread queue */
-static void rcu_gc_reclaim(unsigned long wtidx, void *old)
+static void rcu_gc_clear_queue(unsigned long wtidx)
{
void **p;
- /* Queue pointer */
- *pending_reclaims[wtidx].head = old;
- pending_reclaims[wtidx].head++;
-
- if (likely(pending_reclaims[wtidx].head - pending_reclaims[wtidx].queue
- < reclaim_batch))
- return;
-
- /* If queue is full, wait for Q.S and empty queue */
+ /* Wait for Q.S and empty queue */
synchronize_rcu();
for (p = pending_reclaims[wtidx].queue;
pending_reclaims[wtidx].head = pending_reclaims[wtidx].queue;
}
-static void rcu_gc_cleanup(unsigned long wtidx)
+/* Using per-thread queue */
+static void rcu_gc_reclaim(unsigned long wtidx, void *old)
{
- void **p;
+ /* Queue pointer */
+ *pending_reclaims[wtidx].head = old;
+ pending_reclaims[wtidx].head++;
- /* Wait for Q.S and empty queue */
- synchronize_rcu();
+ if (likely(pending_reclaims[wtidx].head - pending_reclaims[wtidx].queue
+ < reclaim_batch))
+ return;
- for (p = pending_reclaims[wtidx].queue;
- p < pending_reclaims[wtidx].head; p++) {
- /* poison */
- if (*p)
- ((struct test_array *)*p)->a = 0;
- free(*p);
- }
- pending_reclaims[wtidx].head = pending_reclaims[wtidx].queue;
+ rcu_gc_clear_queue(wtidx);
}
void *thr_writer(void *data)
{
unsigned long wtidx = (unsigned long)data;
+#ifdef TEST_LOCAL_GC
+ struct test_array *old = NULL;
+#else
struct test_array *new, *old;
+#endif
printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
"writer", pthread_self(), (unsigned long)gettid());
+ set_affinity();
+
while (!test_go)
{
}
smp_mb();
for (;;) {
+#ifndef TEST_LOCAL_GC
new = malloc(sizeof(*new));
- rcu_copy_mutex_lock();
- old = test_rcu_pointer;
- if (old)
- assert(old->a == 8);
new->a = 8;
old = rcu_xchg_pointer(&test_rcu_pointer, new);
- rcu_copy_mutex_unlock();
+#endif
rcu_gc_reclaim(wtidx, old);
nr_writes++;
if (unlikely(!test_duration_write()))
printf("\n");
}
-cpu_set_t affinity;
-
int main(int argc, char **argv)
{
int err;
unsigned long long *count_reader;
unsigned long long tot_reads = 0, tot_writes = 0;
int i, a;
- int use_affinity = 0;
if (argc < 4) {
show_usage(argc, argv);
return -1;
}
- CPU_ZERO(&affinity);
-
for (i = 4; i < argc; i++) {
if (argv[i][0] != '-')
continue;
return -1;
}
a = atoi(argv[++i]);
- CPU_SET(a, &affinity);
+ cpu_affinities[next_aff++] = a;
use_affinity = 1;
printf_verbose("Adding CPU %d affinity\n", a);
break;
printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
"main", pthread_self(), (unsigned long)gettid());
- if (use_affinity
- && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
- perror("sched_setaffinity");
- exit(-1);
- }
-
tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
count_reader = malloc(sizeof(*count_reader) * nr_readers);
for (i = 0; i < nr_writers; i++)
pending_reclaims[i].head = pending_reclaims[i].queue;
+ next_aff = 0;
+
for (i = 0; i < nr_readers; i++) {
err = pthread_create(&tid_reader[i], NULL, thr_reader,
&count_reader[i]);
if (err != 0)
exit(1);
tot_writes += tot_nr_writes[i];
- rcu_gc_cleanup(i);
+ rcu_gc_clear_queue(i);
}
printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
tot_writes);
printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
"nr_writers %3u "
- "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
+ "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
+ "batch %u\n",
argv[0], duration, nr_readers, rduration,
nr_writers, wdelay, tot_reads, tot_writes,
- tot_reads + tot_writes);
+ tot_reads + tot_writes, reclaim_batch);
free(tid_reader);
free(tid_writer);
free(count_reader);