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 #ifndef LTT_USERTRACE_ROOT
  24 #define LTT_USERTRACE_ROOT "/tmp/ltt-usertrace"
  25 #endif //LTT_USERTRACE_ROOT
  26
  27 struct ltt_buf {
  28         atomic_t        offset;
  29         atomic_t        reserve_count;
  30         atomic_t        commit_count;
  31
  32         atomic_t        events_lost;
  33 };
  34
  35 struct ltt_trace_info {
  36         int init;
  37         int filter;
  38 #ifndef LTT_USE_THREADS
  39         pid_t daemon_id;
  40 #else
  41         pthread_t daemon_id;
  42 #endif //LTT_USE_THREADS
  43         atomic_t nesting;
  44         struct {
  45                 struct ltt_buf facilities;
  46                 struct ltt_buf cpu;
  47                 char facilities_buf[LTT_BUF_SIZE_FACILITIES] __attribute__ ((aligned (8)));
  48                 char cpu_buf[LTT_BUF_SIZE_CPU] __attribute__ ((aligned (8)));
  49         } channel;
  50 };
  51
  52 extern __thread struct ltt_trace_info *thread_trace_info;
  53
  54 void ltt_thread_init(void);
  55
  56 void ltt_usertrace_fast_buffer_switch(void);
  57
  58 #endif //_LTT_USERTRACE_FAST_H