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 static inline void test(unsigned long arg, unsigned long arg2)
  56 {
  57 #ifdef CACHEFLUSH
  58         wbinvd();
  59 #endif
  60         asm volatile ("");
  61         //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
  62         //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
  63 }
  64
  65 static int my_open(struct inode *inode, struct file *file)
  66 {
  67         unsigned int i;
  68         cycles_t cycles1, cycles2;
  69         unsigned long flags;
  70
  71         local_irq_save(flags);
  72         rdtsc_barrier();
  73         cycles1 = get_cycles();
  74         rdtsc_barrier();
  75         for(i=0; i<2000; i++) {
  76                 test(i, i);
  77         }
  78         rdtsc_barrier();
  79         cycles2 = get_cycles();
  80         rdtsc_barrier();
  81         local_irq_restore(flags);
  82         printk("cycles : %llu\n", cycles2-cycles1);
  83         return -EPERM;
  84 }
  85
  86
  87 static struct file_operations my_operations = {
  88         .open = my_open,
  89 };
  90
  91 int init_module(void)
  92 {
  93         pentry = create_proc_entry("testmark", 0444, NULL);
  94         if (pentry)
  95                 pentry->proc_fops = &my_operations;
  96
  97         return 0;
  98 }
  99
 100 void cleanup_module(void)
 101 {
 102         remove_proc_entry("testmark", NULL);
 103 }
 104
 105 MODULE_LICENSE("GPL");
 106 MODULE_AUTHOR("Mathieu Desnoyers");
 107 MODULE_DESCRIPTION("Marker Test");
 108 MODULE_VERSION("1.0");
 109