markers-test/test-mark-speed-edit.c

   1 /* test-mark.c
   2  *
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/proc_fs.h>
   7 #include <linux/sched.h>
   8 #include <linux/timex.h>
   9 #include <linux/marker.h>
  10 #include <asm/ptrace.h>
  11 #include <asm/system.h>
  12
  13 static void pmc_flush_cache(void)
  14   {
  15     /* write back and invalidate cache (a serializing instruction) */
  16
  17     __asm__ __volatile__ ( "wbinvd" : : : "memory" );
  18
  19     /* The wbinvd instruction does not wait for the external caches
  20      * to be flushed, but only requests that it be done.  The loop
  21      * is to be sure that enough time has elapsed, but the compiler
  22      * might simplify or even remove it.  The loop bound is for a
  23      * 512 KB L2 cache.  On a Pentium Pro/II/III, the loop uses
  24      * 2 cycles per iteration.
  25      *
  26      * Does wbinvd also cause the TLB to be flushed?
  27      * A comment in mtrr.c suggests that it does.
  28      */
  29     { register int i; for (i = 0; i < 512*1024; i++) { } }
  30   }
  31
  32
  33
  34 static void noinline test2(const struct marker *mdata,
  35         void *call_private, ...)
  36 {
  37         unsigned char *ins = __builtin_return_address(0) - 5;
  38 #if 0
  39         /* not called */
  40         printk("ip %p\n", __builtin_return_address(0));
  41         printk("prev_ins %hX %hX %hX %hX %hX\n",
  42                 ins[0], ins[1], ins[2], ins[3], ins[4]);
  43 #endif //0
  44         ins[0] = 0x90;
  45         ins[1] = 0x8d;
  46         ins[2] = 0x74;
  47         ins[3] = 0x26;
  48         ins[4] = 0x00;
  49 }
  50
  51 /*
  52  * Generic marker flavor always available.
  53  * Note : the empty asm volatile with read constraint is used here instead of a
  54  * "used" attribute to fix a gcc 4.1.x bug.
  55  * Make sure the alignment of the structure in the __markers section will
  56  * not add unwanted padding between the beginning of the section and the
  57  * structure. Force alignment to the same alignment as the section start.
  58  */
  59 #define __my_trace_mark(generic, name, call_private, format, args...)   \
  60         do {                                                            \
  61                 static const char __mstrtab_##name[]                    \
  62                 __attribute__((section("__markers_strings")))           \
  63                 = #name "\0" format;                                    \
  64                 static struct marker __mark_##name                      \
  65                 __attribute__((section("__markers"), aligned(8))) =     \
  66                 { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)],   \
  67                 0, 0, marker_probe_cb,                                  \
  68                 { __mark_empty_function, NULL}, NULL };                 \
  69                 __mark_check_format(format, ## args);                   \
  70                 if (!generic) {                                         \
  71                         if (unlikely(imv_read(__mark_##name.state)))    \
  72                                 test2                   \
  73                                         (&__mark_##name, call_private,  \
  74                                         ## args);               \
  75                 } else {                                                \
  76                         if (unlikely(_imv_read(__mark_##name.state)))   \
  77                                 test2                   \
  78                                         (&__mark_##name, call_private,  \
  79                                         ## args);               \
  80                 }                                                       \
  81         } while (0)
  82
  83         //asm volatile ("");
  84 struct proc_dir_entry *pentry = NULL;
  85
  86 char temp0[8192];
  87 int temp[8192] __cacheline_aligned;
  88 char temp5[8192];
  89
  90 static inline void test(unsigned long arg, unsigned long arg2)
  91 {
  92 #ifdef CACHEFLUSH
  93         pmc_flush_cache();
  94 #endif
  95         temp[2] = (temp[0] + 60) << 10;
  96         temp[3] = (temp[2] + 60) << 10;
  97         temp[4] = (temp[3] + 60) << 10;
  98         temp[0] = (temp[4] + 60) << 10;
  99         //asm volatile ("");
 100         //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
 101         barrier();
 102         test2(NULL, NULL, 2, current->pid, arg, arg2);
 103         barrier();
 104         //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
 105 }
 106
 107 static int my_open(struct inode *inode, struct file *file)
 108 {
 109         unsigned int i;
 110         cycles_t cycles1, cycles2;
 111         unsigned long flags;
 112
 113         local_irq_save(flags);
 114 #ifdef CACHEFLUSH
 115         pmc_flush_cache();      /* initial write back, without cycle count */
 116         msleep(20);     /* wait for L2 flush */
 117 #endif
 118         rdtsc_barrier();
 119         cycles1 = get_cycles();
 120         rdtsc_barrier();
 121         for(i=0; i<2000; i++) {
 122                 test(i, i);
 123                 test(i, i);
 124                 test(i, i);
 125                 test(i, i);
 126                 test(i, i);
 127                 test(i, i);
 128                 test(i, i);
 129                 test(i, i);
 130                 test(i, i);
 131                 test(i, i);
 132         }
 133         rdtsc_barrier();
 134         cycles2 = get_cycles();
 135         rdtsc_barrier();
 136         local_irq_restore(flags);
 137         printk("cycles : %llu\n", cycles2-cycles1);
 138         return -EPERM;
 139 }
 140
 141
 142 static struct file_operations my_operations = {
 143         .open = my_open,
 144 };
 145
 146 int init_module(void)
 147 {
 148         pentry = create_proc_entry("testmark", 0444, NULL);
 149         if (pentry)
 150                 pentry->proc_fops = &my_operations;
 151
 152         return 0;
 153 }
 154
 155 void cleanup_module(void)
 156 {
 157         remove_proc_entry("testmark", NULL);
 158 }
 159
 160 MODULE_LICENSE("GPL");
 161 MODULE_AUTHOR("Mathieu Desnoyers");
 162 MODULE_DESCRIPTION("Marker Test");
 163 MODULE_VERSION("1.0");
 164