printk(KERN_ALERT "-> non locked cmpxchg takes %llu cycles\n", time);
printk(KERN_ALERT "test end\n");
}
+static void do_test_sync_inc(void)
+{
+ int ret;
+ long flags;
+ unsigned int i;
+ cycles_t time1, time2, time;
+ long rem;
+ atomic_t val;
+
+ local_irq_save(flags);
+ preempt_disable();
+ time1 = get_cycles();
+ for (i = 0; i < NR_LOOPS; i++) {
+ ret = atomic_add_return(10, &val);
+ }
+ time2 = get_cycles();
+ local_irq_restore(flags);
+ preempt_enable();
+ time = time2 - time1;
+
+ printk(KERN_ALERT "test results: time for locked add return\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 "-> locked add return takes %llu cycles\n", time);
+ printk(KERN_ALERT "test end\n");
+}
+
+
+static void do_test_inc(void)
+{
+ int ret;
+ long flags;
+ unsigned int i;
+ cycles_t time1, time2, time;
+ long rem;
+ local_t loc_val;
+
+ local_irq_save(flags);
+ preempt_disable();
+ time1 = get_cycles();
+ for (i = 0; i < NR_LOOPS; i++) {
+ ret = local_add_return(10, &loc_val);
+ }
+ time2 = get_cycles();
+ local_irq_restore(flags);
+ preempt_enable();
+ time = time2 - time1;
+
+ printk(KERN_ALERT "test results: time for non locked add return\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 "-> non locked add return takes %llu cycles\n", time);
+ printk(KERN_ALERT "test end\n");
+}
+
+
/*
* This test will have a higher standard deviation due to incoming interrupts.
do_testbaseline();
do_test_sync_cmpxchg();
do_test_cmpxchg();
+ do_test_sync_inc();
+ do_test_inc();
do_test_enable_int();
do_test_disable_int();
do_test_int();
spin_lock_irqsave(&mylock, flags);
time1 = get_cycles();
for (i = 0; i < NR_LOOPS; i++) {
- spin_unlock_irqrestore(&mylock, flags);
- spin_lock_irqsave(&mylock, flags);
+ spin_unlock(&mylock);
+ spin_lock(&mylock);
}
time2 = get_cycles();
spin_unlock_irqrestore(&mylock, flags);