From 2bbb1caba4eb05d4f1aae2473caf6a627d234158 Mon Sep 17 00:00:00 2001
From: compudj <compudj@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Wed, 13 Aug 2008 23:08:53 +0000
Subject: [PATCH] add test prefix speed

git-svn-id: http://ltt.polymtl.ca/svn@3018 04897980-b3bd-0310-b5e0-8ef037075253
---
 trunk/tests/kernel/Makefile            |   1 +
 trunk/tests/kernel/test-prefix-speed.c | 139 +++++++++++++++++++++++++
 2 files changed, 140 insertions(+)
 create mode 100644 trunk/tests/kernel/test-prefix-speed.c

diff --git a/trunk/tests/kernel/Makefile b/trunk/tests/kernel/Makefile
index 5d68be3a..a940d08b 100644
--- a/trunk/tests/kernel/Makefile
+++ b/trunk/tests/kernel/Makefile
@@ -15,6 +15,7 @@ endif
 	#obj-m += test-sys_call.o
 #	obj-m += test-bug.o
 	obj-m += test-nop-speed.o
+	obj-m += test-prefix-speed.o
 #	obj-m += test-cmpxchg-nolock2.o
 #	obj-m += test-trace-speed.o
 #	obj-m += test-rcu-speed.o
diff --git a/trunk/tests/kernel/test-prefix-speed.c b/trunk/tests/kernel/test-prefix-speed.c
new file mode 100644
index 00000000..2ad63fcb
--- /dev/null
+++ b/trunk/tests/kernel/test-prefix-speed.c
@@ -0,0 +1,139 @@
+/* test-nop-speed.c
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/timex.h>
+#include <asm/atomic.h>
+#include <asm/ptrace.h>
+
+#define NR_TESTS 10000000
+
+int var, var2;
+atomic64_t atomicval;
+
+struct proc_dir_entry *pentry = NULL;
+
+
+static inline long test_nop_atomic64_add_return(long i, atomic64_t *v)
+{
+	long __i = i;
+	asm volatile(".byte 0x90;"
+		     "xaddq %0, %1;"
+		     : "+r" (i), "+m" (v->counter)
+		     : : "memory");
+	return i + __i;
+}
+
+static inline long test_prefix_atomic64_add_return(long i, atomic64_t *v)
+{
+	long __i = i;
+	asm volatile(".byte 0x3E;"
+		     "xaddq %0, %1;"
+		     : "+r" (i), "+m" (v->counter)
+		     : : "memory");
+	return i + __i;
+}
+
+static inline long test_lock_atomic64_add_return(long i, atomic64_t *v)
+{
+	long __i = i;
+	asm volatile(".byte 0xf0;"
+		     "xaddq %0, %1;"
+		     : "+r" (i), "+m" (v->counter)
+		     : : "memory");
+	return i + __i;
+}
+
+
+
+void empty(void)
+{
+	asm volatile ("");
+	var += 50;
+	var /= 10;
+	var *= var2;
+}
+
+void testnop(void)
+{
+	test_nop_atomic64_add_return(5, &atomicval);
+	var += 50;
+	var /= 10;
+	var *= var2;
+}
+
+void testprefix(void)
+{
+	test_prefix_atomic64_add_return(5, &atomicval);
+	var += 50;
+	var /= 10;
+	var *= var2;
+}
+
+void testlock(void)
+{
+	test_lock_atomic64_add_return(5, &atomicval);
+	var += 50;
+	var /= 10;
+	var *= var2;
+}
+
+
+
+void perform_test(const char *name, void (*callback)(void))
+{
+	unsigned int i;
+	cycles_t cycles1, cycles2;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	rdtsc_barrier();
+	cycles1 = get_cycles();
+	rdtsc_barrier();
+	for(i=0; i<NR_TESTS; i++) {
+		callback();
+	}
+	rdtsc_barrier();
+	cycles2 = get_cycles();
+	rdtsc_barrier();
+	local_irq_restore(flags);
+	printk("test %s cycles : %llu\n", name, cycles2-cycles1);
+}
+
+static int my_open(struct inode *inode, struct file *file)
+{
+	printk("NR_TESTS %d\n", NR_TESTS);
+
+	perform_test("empty", empty);
+	perform_test("test 1-byte nop xadd", testnop);
+	perform_test("test DS override prefix xadd", testprefix);
+	perform_test("test LOCK xadd", testlock);
+
+	return -EPERM;
+}
+
+
+static struct file_operations my_operations = {
+	.open = my_open,
+};
+
+int init_module(void)
+{
+	pentry = create_proc_entry("testnops", 0444, NULL);
+	if (pentry)
+		pentry->proc_fops = &my_operations;
+
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	remove_proc_entry("testnops", NULL);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("NOP Test");
-- 
2.34.1