X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=test_qsbr.c;h=af5ccfd58317d06d5c1e2d6c37ac0f268b0c5e16;hp=6830fe1d2c1c77f144f1f28760bf2a2123cff2c4;hb=2a7ac59da1436b86d7cb59fb8b5712c7d98c1519;hpb=65f03794a386588df536051ca4df9fd6e777f372

diff --git a/test_qsbr.c b/test_qsbr.c
index 6830fe1..af5ccfd 100644
--- a/test_qsbr.c
+++ b/test_qsbr.c
@@ -38,6 +38,9 @@
 /* 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)
@@ -85,6 +88,26 @@ static int verbose_mode;
 			printf(fmt, args);	\
 	} while (0)
 
+static unsigned int cpu_affinities[NR_CPUS];
+static unsigned int next_aff = 0;
+static int use_affinity = 0;
+
+static void set_affinity(void)
+{
+	cpu_set_t mask;
+	int cpu;
+
+	if (!use_affinity)
+		return;
+
+	cpu = cpu_affinities[next_aff++];
+	CPU_ZERO(&mask);
+	CPU_SET(cpu, &mask);
+	sched_setaffinity(0, sizeof(mask), &mask);
+}
+
+
+
 /*
  * returns 0 if test should end.
  */
@@ -171,6 +194,8 @@ void *thr_reader(void *_count)
 	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)
@@ -212,6 +237,8 @@ void *thr_writer(void *_count)
 	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 			"writer", pthread_self(), (unsigned long)gettid());
 
+	set_affinity();
+
 	while (!test_go)
 	{
 	}
@@ -256,8 +283,6 @@ void show_usage(int argc, char **argv)
 	printf("\n");
 }
 
-cpu_set_t affinity;
-
 int main(int argc, char **argv)
 {
 	int err;
@@ -266,7 +291,6 @@ int main(int argc, char **argv)
 	unsigned long long *count_reader, *count_writer;
 	unsigned long long tot_reads = 0, tot_writes = 0;
 	int i, a;
-	int use_affinity = 0;
 
 	if (argc < 4) {
 		show_usage(argc, argv);
@@ -291,8 +315,6 @@ int main(int argc, char **argv)
 		return -1;
 	}
 
-	CPU_ZERO(&affinity);
-
 	for (i = 4; i < argc; i++) {
 		if (argv[i][0] != '-')
 			continue;
@@ -311,7 +333,7 @@ int main(int argc, char **argv)
 				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;
@@ -342,34 +364,14 @@ int main(int argc, char **argv)
 	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 			"main", pthread_self(), (unsigned long)gettid());
 
-	if (use_affinity) {
-		for (i = 0; i < CPU_SETSIZE; i++)
-			if (CPU_ISSET(i, &affinity))
-				printf_verbose("About to set affinity "
-					       "to CPU : %d\n", i);
-
-		if (sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
-			perror("sched_setaffinity");
-			exit(-1);
-		}
-
-		if (sched_getaffinity(0, sizeof(affinity), &affinity) < 0) {
-			perror("sched_getaffinity");
-			exit(-1);
-		}
-
-		for (i = 0; i < CPU_SETSIZE; i++)
-			if (CPU_ISSET(i, &affinity))
-				printf_verbose("Effectively set affinity "
-					       "to CPU : %d\n", i);
-	}
-
 	test_array = malloc(sizeof(*test_array) * ARRAY_SIZE);
 	tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 	tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 	count_reader = malloc(sizeof(*count_reader) * nr_readers);
 	count_writer = malloc(sizeof(*count_writer) * nr_writers);
 
+	next_aff = 0;
+
 	for (i = 0; i < nr_readers; i++) {
 		err = pthread_create(&tid_reader[i], NULL, thr_reader,
 				     &count_reader[i]);