libcounter/counter-types.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * LTTng Counters Types
   7  */
   8
   9 #ifndef _LTTNG_COUNTER_TYPES_H
  10 #define _LTTNG_COUNTER_TYPES_H
  11
  12 #include <stdint.h>
  13 #include <stddef.h>
  14 #include <stdbool.h>
  15 #include <sys/types.h>
  16 #include <lttng/counter-config.h>
  17 #include <lttng/ust-config.h>
  18 #include "shm_types.h"
  19
  20 struct lib_counter_dimension {
  21         /*
  22          * Max. number of indexable elements.
  23          */
  24         size_t max_nr_elem;
  25         /*
  26          * The stride for a dimension is the multiplication factor which
  27          * should be applied to its index to take into account other
  28          * dimensions nested inside.
  29          */
  30         size_t stride;
  31 };
  32
  33 struct lib_counter_layout {
  34         void *counters;
  35         unsigned long *overflow_bitmap;
  36         unsigned long *underflow_bitmap;
  37         int shm_fd;
  38         size_t shm_len;
  39         struct lttng_counter_shm_handle handle;
  40 };
  41
  42 enum lib_counter_arithmetic {
  43         LIB_COUNTER_ARITHMETIC_MODULAR,
  44         LIB_COUNTER_ARITHMETIC_SATURATE,
  45 };
  46
  47 struct lib_counter {
  48         size_t nr_dimensions;
  49         int64_t allocated_elem;
  50         struct lib_counter_dimension *dimensions;
  51         enum lib_counter_arithmetic arithmetic;
  52         union {
  53                 struct {
  54                         int32_t max, min;
  55                 } limits_32_bit;
  56                 struct {
  57                         int64_t max, min;
  58                 } limits_64_bit;
  59         } saturation;
  60         union {
  61                 int8_t s8;
  62                 int16_t s16;
  63                 int32_t s32;
  64                 int64_t s64;
  65         } global_sum_step;              /* 0 if unused */
  66         struct lib_counter_config config;
  67
  68         struct lib_counter_layout global_counters;
  69         struct lib_counter_layout *percpu_counters;
  70
  71         bool is_daemon;
  72         struct lttng_counter_shm_object_table *object_table;
  73 };
  74
  75 #endif /* _LTTNG_COUNTER_TYPES_H */