include/counter/counter-types.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * counter/counter-types.h
   4  *
   5  * LTTng Counters Types
   6  *
   7  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_COUNTER_TYPES_H
  11 #define _LTTNG_COUNTER_TYPES_H
  12
  13 #include <linux/types.h>
  14 #include <linux/percpu.h>
  15 #include <counter/config.h>
  16
  17 struct lib_counter_dimension {
  18         /*
  19          * Max. number of indexable elements.
  20          */
  21         size_t max_nr_elem;
  22         /*
  23          * The stride for a dimension is the multiplication factor which
  24          * should be applied to its index to take into account other
  25          * dimensions nested inside.
  26          */
  27         size_t stride;
  28 };
  29
  30 struct lib_counter_layout {
  31         void *counters;
  32         unsigned long *underflow_bitmap;
  33         unsigned long *overflow_bitmap;
  34 };
  35
  36 enum lib_counter_arithmetic {
  37         LIB_COUNTER_ARITHMETIC_MODULAR,
  38         LIB_COUNTER_ARITHMETIC_SATURATE,
  39 };
  40
  41 struct lib_counter {
  42         size_t nr_dimensions;
  43         int64_t allocated_elem;
  44         struct lib_counter_dimension *dimensions;
  45         enum lib_counter_arithmetic arithmetic;
  46         union {
  47                 struct {
  48                         int32_t max, min;
  49                 } limits_32_bit;
  50                 struct {
  51                         int64_t max, min;
  52                 } limits_64_bit;
  53         } saturation;
  54         union {
  55                 int8_t s8;
  56                 int16_t s16;
  57                 int32_t s32;
  58                 int64_t s64;
  59         } global_sum_step;              /* 0 if unused */
  60         struct lib_counter_config config;
  61
  62         struct lib_counter_layout global_counters;
  63         struct lib_counter_layout __percpu *percpu_counters;
  64 };
  65
  66 #endif /* _LTTNG_COUNTER_TYPES_H */