usertrace-fast/ltt-usertrace-fast.h

   1
   2 /* LTTng user-space "fast" tracing header
   3  *
   4  * Copyright 2006 Mathieu Desnoyers
   5  *
   6  */
   7
   8 #ifndef _LTT_USERTRACE_FAST_H
   9 #define _LTT_USERTRACE_FAST_H
  10
  11 #include <errno.h>
  12 #include <asm/atomic.h>
  13 #include <pthread.h>
  14
  15 #ifndef LTT_BUF_SIZE_CPU
  16 #define LTT_BUF_SIZE_CPU 1048576
  17 #endif //LTT_BUF_SIZE_CPU
  18
  19 #ifndef LTT_BUF_SIZE_FACILITIES
  20 #define LTT_BUF_SIZE_FACILITIES 4096
  21 #endif //LTT_BUF_SIZE_FACILITIES
  22
  23 struct ltt_buf {
  24         atomic_t        offset;
  25         atomic_t        reserve_count;
  26         atomic_t        commit_count;
  27
  28         atomic_t        events_lost;
  29 };
  30
  31 struct ltt_trace_info {
  32         int init;
  33         int filter;
  34 #ifndef LTT_USE_THREADS
  35         pid_t daemon_id;
  36 #else
  37         pthread_t daemon_id;
  38 #endif //LTT_USE_THREADS
  39         atomic_t nesting;
  40         struct {
  41                 struct ltt_buf facilities;
  42                 struct ltt_buf cpu;
  43                 char facilities_buf[LTT_BUF_SIZE_FACILITIES] __attribute__ ((aligned (8)));
  44                 char cpu_buf[LTT_BUF_SIZE_CPU] __attribute__ ((aligned (8)));
  45         } channel;
  46 };
  47
  48 extern __thread struct ltt_trace_info *thread_trace_info;
  49
  50 void ltt_thread_init(void);
  51
  52 void ltt_usertrace_fast_buffer_switch(void);
  53
  54 #endif //_LTT_USERTRACE_FAST_H