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

diff --git a/markers-test/test-mark-speed-empty.c b/markers-test/test-mark-speed-empty.c
index ceaac9da04616a66eca206e0da81f35cdc9d4c37..e9ea607b85e09cde3c38517d3752e59a2e404d5a 100644 (file)
--- a/markers-test/test-mark-speed-empty.c
+++ b/markers-test/test-mark-speed-empty.c
@@ -10,6 +10,29 @@
 #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, ...)
 {
@@ -52,14 +75,12 @@ static void noinline test2(const struct marker *mdata,
        //asm volatile ("");
 struct proc_dir_entry *pentry = NULL;
 
-char temp0[8192];
-int temp[8192] __cacheline_aligned;
-char temp5[8192];
-
 static inline void test(unsigned long arg, unsigned long arg2)
 {
+       volatile int temp[5];
 #ifdef CACHEFLUSH
-       wbinvd();
+       clflush(&current->pid);
+       //pmc_flush_cache();
 #endif
        temp[2] = (temp[0] + 60) << 10;
        temp[3] = (temp[2] + 60) << 10;
@@ -80,8 +101,8 @@ static int my_open(struct inode *inode, struct file *file)
 
        local_irq_save(flags);
 #ifdef CACHEFLUSH
-       wbinvd();       /* initial write back, without cycle count */
-       msleep(20);     /* wait for L2 flush */
+       //pmc_flush_cache();    /* initial write back, without cycle count */
+       //msleep(20);   /* wait for L2 flush */
 #endif
        rdtsc_barrier();
        cycles1 = get_cycles();