Documentation/perf_counter/perf.h

   1 #ifndef _PERF_PERF_H
   2 #define _PERF_PERF_H
   3
   4 /*
   5  * prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
   6  * counters in the current task.
   7  */
   8 #define PR_TASK_PERF_COUNTERS_DISABLE   31
   9 #define PR_TASK_PERF_COUNTERS_ENABLE    32
  10
  11 #ifndef NSEC_PER_SEC
  12 # define NSEC_PER_SEC                   1000000000ULL
  13 #endif
  14
  15 static inline unsigned long long rdclock(void)
  16 {
  17         struct timespec ts;
  18
  19         clock_gettime(CLOCK_MONOTONIC, &ts);
  20         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
  21 }
  22
  23 /*
  24  * Pick up some kernel type conventions:
  25  */
  26 #define __user
  27 #define asmlinkage
  28
  29 #ifdef __x86_64__
  30 #define __NR_perf_counter_open 298
  31 #define rmb()           asm volatile("lfence" ::: "memory")
  32 #define cpu_relax()     asm volatile("rep; nop" ::: "memory");
  33 #endif
  34
  35 #ifdef __i386__
  36 #define __NR_perf_counter_open 336
  37 #define rmb()           asm volatile("lfence" ::: "memory")
  38 #define cpu_relax()     asm volatile("rep; nop" ::: "memory");
  39 #endif
  40
  41 #ifdef __powerpc__
  42 #define __NR_perf_counter_open 319
  43 #define rmb()           asm volatile ("sync" ::: "memory")
  44 #define cpu_relax()     asm volatile ("" ::: "memory");
  45 #endif
  46
  47 #define unlikely(x)     __builtin_expect(!!(x), 0)
  48 #define min(x, y) ({                            \
  49         typeof(x) _min1 = (x);                  \
  50         typeof(y) _min2 = (y);                  \
  51         (void) (&_min1 == &_min2);              \
  52         _min1 < _min2 ? _min1 : _min2; })
  53
  54 static inline int
  55 sys_perf_counter_open(struct perf_counter_hw_event *hw_event_uptr,
  56                       pid_t pid, int cpu, int group_fd,
  57                       unsigned long flags)
  58 {
  59         return syscall(__NR_perf_counter_open, hw_event_uptr, pid, cpu,
  60                        group_fd, flags);
  61 }
  62
  63 #define MAX_COUNTERS                    64
  64 #define MAX_NR_CPUS                     256
  65
  66 #define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
  67
  68 #endif