update quickstart

[lttv.git] / markers-test / test-mark-speed.c

diff --git a/markers-test/test-mark-speed.c b/markers-test/test-mark-speed.c
index c3c5bc1768745f14b3a169e7046578bfc28883c8..015ce4997f7c7cab9b52c014bdaa225dcc23dd3e 100644 (file)
--- a/markers-test/test-mark-speed.c
+++ b/markers-test/test-mark-speed.c
@@ -8,6 +8,30 @@
 #include <linux/timex.h>
 #include <linux/marker.h>
 #include <asm/ptrace.h>
+#include <asm/system.h>
+
+static void pmc_flush_cache(void)
+{
+    register int i;
+    /* write back and invalidate cache (a serializing instruction) */
+
+    __asm__ __volatile__ ( "wbinvd" : : : "memory" );
+
+    /* The wbinvd instruction does not wait for the external caches
+     * to be flushed, but only requests that it be done.  The loop
+     * is to be sure that enough time has elapsed, but the compiler
+     * might simplify or even remove it.  The loop bound is for a
+     * 512 KB L2 cache.  On a Pentium Pro/II/III, the loop uses
+     * 2 cycles per iteration.
+     *
+     * Does wbinvd also cause the TLB to be flushed?
+     * A comment in mtrr.c suggests that it does.
+     */
+    for (i = 0; i < 512*1024; i++) {
+       cpu_relax();
+    }
+}
+
 static void noinline test2(const struct marker *mdata,
         void *call_private, ...)
 {
@@ -15,6 +39,12 @@ static void noinline test2(const struct marker *mdata,
        printk("blah\n");
 }
 
+#ifdef CACHEFLUSH
+#define myclflush(a) clflush(a)
+#else
+#define myclflush(a)
+#endif                                                                 \
+
 /*
  * Generic marker flavor always available.
  * Note : the empty asm volatile with read constraint is used here instead of a
@@ -40,6 +70,7 @@ static void noinline test2(const struct marker *mdata,
                                        (&__mark_##name, call_private,  \
                                        ## args);               \
                } else {                                                \
+                       myclflush(&_imv_read(__mark_##name.state));     \
                        if (unlikely(_imv_read(__mark_##name.state)))   \
                                test2                   \
                                        (&__mark_##name, call_private,  \
@@ -52,8 +83,15 @@ struct proc_dir_entry *pentry = NULL;
 
 static inline void test(unsigned long arg, unsigned long arg2)
 {
+       volatile int temp[5];
+       temp[2] = (temp[0] + 60) << 10;
+       temp[3] = (temp[2] + 60) << 10;
+       temp[4] = (temp[3] + 60) << 10;
+       temp[0] = (temp[4] + 60) << 10;
        //asm volatile ("");
+       barrier();
        __my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
+       barrier();
        //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
 }
 
@@ -64,10 +102,23 @@ static int my_open(struct inode *inode, struct file *file)
        unsigned long flags;
 
        local_irq_save(flags);
+#ifdef CACHEFLUSH
+       //pmc_flush_cache();    /* initial write back, without cycle count */
+       //msleep(20);   /* wait for L2 flush */
+#endif
        rdtsc_barrier();
        cycles1 = get_cycles();
        rdtsc_barrier();
-       for(i=0; i<20000; i++) {
+       for(i=0; i<2000; i++) {
+               test(i, i);
+               test(i, i);
+               test(i, i);
+               test(i, i);
+               test(i, i);
+               test(i, i);
+               test(i, i);
+               test(i, i);
+               test(i, i);
                test(i, i);
        }
        rdtsc_barrier();
@@ -100,4 +151,4 @@ void cleanup_module(void)
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mathieu Desnoyers");
 MODULE_DESCRIPTION("Marker Test");
-
+MODULE_VERSION("1.0");