Start basic layout of context switch benchmark test for async module. Not tested or built yet.

src/tests/ctx-switch/main.c

+/*
+ * main.c
+ *
+ * This file is part of the benchmarking tests for libasync.
+ * This file is responsible for measuring the context switch time.
+ *
+ * Author: Michael Quigley
+ * Date: March 2016
+ */
+
+#include <libfipc.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "../test_helpers.h"
+
+MODULE_LICENSE("GPL");
+
+#define NUM_SWITCH_MEASUREMENTS 1000
+
+static unsigned long ctx_switch_measurements[NUM_SWITCH_MEASUREMENTS];
+
+
+static int setup_and_run_test(void)
+{
+    unsigned long start_time, end_time, elapsed_time;
+    uint32_t msg_id;
+
+    thc_init();
+    
+    for( int i = 0; i < NUM_SWITCH_MEASUREMENTS; i++ )
+    {
+        DO_FINISH_(ctx_switch,{
+            ASYNC({
+                msg_id = awe_mapper_create_id();
+                THCYieldAndSave(msg_id);
+                end_time = test_fipc_stop_stopwatch();
+            });             
+            ASYNC({
+                start_time = test_fipc_start_stopwatch(); 
+                THCYieldToId(msg_id);
+                awe_mapper_remove_id(msg_id);
+                });             
+        });
+
+        ctx_switch_measurements[i] = end_time - start_time;
+    }
+    
+    printk(KERN_ERR "Timing results of performing %d switches between awe contexts:\n", NUM_SWITCH_MEASUREMENTS);
+    test_fipc_dump_time(ctx_switch_measurements, NUM_SWITCH_MEASUREMENTS);
+
+    thc_done();
+}
+
+
+static int __init ctx_switch_init(void)
+{
+	int ret = 0;
+
+	LCD_MAIN({ ret = setup_and_run_test(); });
+
+    return ret;
+}
+
+
+static void __exit ctx_switch_rmmod(void)
+{
+	return;
+}
+
+
+module_init(ctx_switch_init);
+module_exit(ctx_switch_rmmod);

src/tests/test_helpers.c

+#include "test_helpers.h"
+
+
+
+static int test_fipc_compare(const void *_a, const void *_b){
+
+	u64 a = *((u64 *)_a);
+	u64 b = *((u64 *)_b);
+
+	if(a < b)
+		return -1;
+	if(a > b)
+		return 1;
+	return 0;
+}
+
+
+

src/tests/test_helpers.h

@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <linux/kthread.h>
 #include <linux/kernel.h>
+#include <linux/sort.h>
 #include <libfipc.h>
 
 #define LCD_MAIN(_CODE)    do {                        \
@@ -260,4 +261,32 @@ static inline unsigned long test_fipc_stop_stopwatch(void)
 	return stamp;
 }
 
+
+static int test_fipc_compare(const void *_a, const void *_b);
+
+
+static inline void test_fipc_dump_time(unsigned long *time, unsigned long num_transactions)
+{
+
+	int i;
+	unsigned long long counter = 0;
+    unsigned long min;
+	unsigned long max;
+
+	for (i = 0; i < num_transactions; i++) {
+		counter+= time[i];
+	}
+
+	sort(time, num_transactions, sizeof(unsigned long), test_fipc_compare, NULL);
+
+	min = time[0];
+	max = time[num_transactions-1];
+	counter = min;
+
+	printk(KERN_ERR "MIN\tMAX\tAVG\tMEDIAN\n");
+	printk(KERN_ERR "%lu & %lu & %llu & %lu \n", min, max, counter/num_transactions, time[num_transactions/2]);
+
+}
+
+
 #endif /* FIPC_KERNEL_TEST_HELPERS_H */