/* 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)
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)
printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
"writer", pthread_self(), (unsigned long)gettid());
+ set_affinity();
+
while (!test_go)
{
}
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]);