ltt-tracer-core.h

   1 /*
   2  * Copyright (C) 2005,2006 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
   3  *
   4  * This contains the core definitions for the Linux Trace Toolkit.
   5  *
   6  * Dual LGPL v2.1/GPL v2 license.
   7  */
   8
   9 #ifndef LTT_TRACER_CORE_H
  10 #define LTT_TRACER_CORE_H
  11
  12 #include <linux/list.h>
  13 #include <linux/percpu.h>
  14 #include <linux/ltt-core.h>
  15
  16 /* ltt's root dir in debugfs */
  17 #define LTT_ROOT        "ltt"
  18
  19 /*
  20  * All modifications of ltt_traces must be done by ltt-tracer.c, while holding
  21  * the semaphore. Only reading of this information can be done elsewhere, with
  22  * the RCU mechanism : the preemption must be disabled while reading the
  23  * list.
  24  */
  25 struct ltt_traces {
  26         struct list_head setup_head;    /* Pre-allocated traces list */
  27         struct list_head head;          /* Allocated Traces list */
  28         unsigned int num_active_traces; /* Number of active traces */
  29 } ____cacheline_aligned;
  30
  31 extern struct ltt_traces ltt_traces;
  32
  33 /*
  34  * get dentry of ltt's root dir
  35  */
  36 struct dentry *get_ltt_root(void);
  37
  38 void put_ltt_root(void);
  39
  40 /* Keep track of trap nesting inside LTT */
  41 DECLARE_PER_CPU(unsigned int, ltt_nesting);
  42
  43 typedef int (*ltt_run_filter_functor)(void *trace, uint16_t eID);
  44
  45 extern ltt_run_filter_functor ltt_run_filter;
  46
  47 extern void ltt_filter_register(ltt_run_filter_functor func);
  48 extern void ltt_filter_unregister(void);
  49
  50 #endif /* LTT_TRACER_CORE_H */