markers-test/test-mark-speed-empty.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 noinline test2(const struct marker *mdata,
  14         void *call_private, ...)
  15 {
  16         /* not called */
  17         printk("blah\n");
  18 }
  19
  20 /*
  21  * Generic marker flavor always available.
  22  * Note : the empty asm volatile with read constraint is used here instead of a
  23  * "used" attribute to fix a gcc 4.1.x bug.
  24  * Make sure the alignment of the structure in the __markers section will
  25  * not add unwanted padding between the beginning of the section and the
  26  * structure. Force alignment to the same alignment as the section start.
  27  */
  28 #define __my_trace_mark(generic, name, call_private, format, args...)   \
  29         do {                                                            \
  30                 static const char __mstrtab_##name[]                    \
  31                 __attribute__((section("__markers_strings")))           \
  32                 = #name "\0" format;                                    \
  33                 static struct marker __mark_##name                      \
  34                 __attribute__((section("__markers"), aligned(8))) =     \
  35                 { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)],   \
  36                 0, 0, marker_probe_cb,                                  \
  37                 { __mark_empty_function, NULL}, NULL };                 \
  38                 __mark_check_format(format, ## args);                   \
  39                 if (!generic) {                                         \
  40                         if (unlikely(imv_read(__mark_##name.state)))    \
  41                                 test2                   \
  42                                         (&__mark_##name, call_private,  \
  43                                         ## args);               \
  44                 } else {                                                \
  45                         if (unlikely(_imv_read(__mark_##name.state)))   \
  46                                 test2                   \
  47                                         (&__mark_##name, call_private,  \
  48                                         ## args);               \
  49                 }                                                       \
  50         } while (0)
  51
  52         //asm volatile ("");
  53 struct proc_dir_entry *pentry = NULL;
  54
  55 char temp0[8192];
  56 int temp __cacheline_aligned = 10;
  57 char temp2[8192];
  58
  59 static inline void test(unsigned long arg, unsigned long arg2)
  60 {
  61 #ifdef CACHEFLUSH
  62         wbinvd();
  63 #endif
  64         temp = (temp + 60) << 10;
  65         barrier();
  66         asm ("");
  67         barrier();
  68         //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
  69         //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
  70 }
  71
  72 static int my_open(struct inode *inode, struct file *file)
  73 {
  74         unsigned int i;
  75         cycles_t cycles1, cycles2;
  76         unsigned long flags;
  77
  78         local_irq_save(flags);
  79         rdtsc_barrier();
  80         cycles1 = get_cycles();
  81         rdtsc_barrier();
  82         for(i=0; i<2000; i++) {
  83                 test(i, i);
  84                 test(i, i);
  85                 test(i, i);
  86                 test(i, i);
  87                 test(i, i);
  88                 test(i, i);
  89                 test(i, i);
  90                 test(i, i);
  91                 test(i, i);
  92                 test(i, i);
  93         }
  94         rdtsc_barrier();
  95         cycles2 = get_cycles();
  96         rdtsc_barrier();
  97         local_irq_restore(flags);
  98         printk("cycles : %llu\n", cycles2-cycles1);
  99         return -EPERM;
 100 }
 101
 102
 103 static struct file_operations my_operations = {
 104         .open = my_open,
 105 };
 106
 107 int init_module(void)
 108 {
 109         pentry = create_proc_entry("testmark", 0444, NULL);
 110         if (pentry)
 111                 pentry->proc_fops = &my_operations;
 112
 113         return 0;
 114 }
 115
 116 void cleanup_module(void)
 117 {
 118         remove_proc_entry("testmark", NULL);
 119 }
 120
 121 MODULE_LICENSE("GPL");
 122 MODULE_AUTHOR("Mathieu Desnoyers");
 123 MODULE_DESCRIPTION("Marker Test");
 124 MODULE_VERSION("1.0");
 125