X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=tests%2Fkernel%2Ftest-cmpxchg-nolock2.c;h=fcae83e44fd546acefd4bd1e910d58b5bb207120;hb=54e7c22401bde470df54f7b9c1b02d126a1b8c80;hp=c1bec8971f7b712dfb35d899c861384df7636ce7;hpb=fa2b47ddc10cc4a9c65be7898d4a3f229387576f;p=lttv.git

diff --git a/tests/kernel/test-cmpxchg-nolock2.c b/tests/kernel/test-cmpxchg-nolock2.c
index c1bec897..fcae83e4 100644
--- a/tests/kernel/test-cmpxchg-nolock2.c
+++ b/tests/kernel/test-cmpxchg-nolock2.c
@@ -16,6 +16,33 @@
 
 int test_val;
 
+static void do_testbaseline(void)
+{
+	int ret;
+	long flags;
+	unsigned int i;
+	cycles_t time1, time2, time;
+	long rem;
+
+	local_irq_save(flags);
+	preempt_disable();
+	time1 = get_cycles();
+	for (i = 0; i < NR_LOOPS; i++) {
+		asm volatile ("");
+	}
+	time2 = get_cycles();
+	local_irq_restore(flags);
+	preempt_enable();
+	time = time2 - time1;
+
+	printk(KERN_ALERT "test results: time for baseline\n");
+	printk(KERN_ALERT "number of loops: %d\n", NR_LOOPS);
+	printk(KERN_ALERT "total time: %llu\n", time);
+	time = div_long_long_rem(time, NR_LOOPS, &rem);
+	printk(KERN_ALERT "-> baseline takes %llu cycles\n", time);
+	printk(KERN_ALERT "test end\n");
+}
+
 static void do_test_sync_cmpxchg(void)
 {
 	int ret;
@@ -131,16 +158,46 @@ static void do_test_disable_int(void)
 	printk(KERN_ALERT "test end\n");
 }
 
+static void do_test_int(void)
+{
+	long flags;
+	unsigned int i;
+	cycles_t time1, time2, time;
+	long rem;
+
+	local_irq_save(flags);
+	preempt_disable();
+	time1 = get_cycles();
+	for (i = 0; i < NR_LOOPS; i++) {
+		local_irq_restore(flags);
+		local_irq_save(flags);
+	}
+	time2 = get_cycles();
+	local_irq_restore(flags);
+	preempt_enable();
+	time = time2 - time1;
+
+	printk(KERN_ALERT "test results: time for disabling/enabling interrupts (STI/CLI)\n");
+	printk(KERN_ALERT "number of loops: %d\n", NR_LOOPS);
+	printk(KERN_ALERT "total time: %llu\n", time);
+	time = div_long_long_rem(time, NR_LOOPS, &rem);
+	printk(KERN_ALERT "-> enabling/disabling interrupts (STI/CLI) takes %llu cycles\n",
+					time);
+	printk(KERN_ALERT "test end\n");
+}
+
 
 
 static int ltt_test_init(void)
 {
 	printk(KERN_ALERT "test init\n");
 	
+	do_testbaseline();
 	do_test_sync_cmpxchg();
 	do_test_cmpxchg();
 	do_test_enable_int();
 	do_test_disable_int();
+	do_test_int();
 	return -EAGAIN; /* Fail will directly unload the module */
 }