liblttng-ust/lttng-counter-client-percpu-32-modular.c

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng-counter-client-percpu-32-modular.c
   4  *
   5  * LTTng lib counter client. Per-cpu 32-bit counters in modular
   6  * arithmetic.
   7  *
   8  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  */
  10
  11 #include <lttng/ust-events.h>
  12 #include "../libcounter/counter.h"
  13 #include "../libcounter/counter-api.h"
  14 #include "lttng-tracer-core.h"
  15
  16 static const struct lib_counter_config client_config = {
  17         .alloc = COUNTER_ALLOC_PER_CPU,
  18         .sync = COUNTER_SYNC_PER_CPU,
  19         .arithmetic = COUNTER_ARITHMETIC_MODULAR,
  20         .counter_size = COUNTER_SIZE_32_BIT,
  21 };
  22
  23 static struct lib_counter *counter_create(size_t nr_dimensions,
  24                                           const size_t *max_nr_elem,
  25                                           int64_t global_sum_step,
  26                                           int global_counter_fd,
  27                                           int nr_counter_cpu_fds,
  28                                           const int *counter_cpu_fds,
  29                                           bool is_daemon)
  30 {
  31         if (nr_dimensions > LTTNG_COUNTER_DIMENSION_MAX)
  32                 return NULL;
  33         return lttng_counter_create(&client_config, nr_dimensions, max_nr_elem,
  34                                     global_sum_step, global_counter_fd, nr_counter_cpu_fds,
  35                                     counter_cpu_fds, is_daemon);
  36 }
  37
  38 static void counter_destroy(struct lib_counter *counter)
  39 {
  40         lttng_counter_destroy(counter);
  41 }
  42
  43 static int counter_add(struct lib_counter *counter, const size_t *dimension_indexes, int64_t v)
  44 {
  45         return lttng_counter_add(&client_config, counter, dimension_indexes, v);
  46 }
  47
  48 static int counter_read(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
  49                         int64_t *value, bool *overflow, bool *underflow)
  50 {
  51         return lttng_counter_read(&client_config, counter, dimension_indexes, cpu, value,
  52                                   overflow, underflow);
  53 }
  54
  55 static int counter_aggregate(struct lib_counter *counter, const size_t *dimension_indexes,
  56                              int64_t *value, bool *overflow, bool *underflow)
  57 {
  58         return lttng_counter_aggregate(&client_config, counter, dimension_indexes, value,
  59                                        overflow, underflow);
  60 }
  61
  62 static int counter_clear(struct lib_counter *counter, const size_t *dimension_indexes)
  63 {
  64         return lttng_counter_clear(&client_config, counter, dimension_indexes);
  65 }
  66
  67 static struct lttng_counter_transport lttng_counter_transport = {
  68         .name = "counter-per-cpu-32-modular",
  69         .ops = {
  70                 .counter_create = counter_create,
  71                 .counter_destroy = counter_destroy,
  72                 .counter_add = counter_add,
  73                 .counter_read = counter_read,
  74                 .counter_aggregate = counter_aggregate,
  75                 .counter_clear = counter_clear,
  76         },
  77         .client_config = &client_config,
  78 };
  79
  80 void lttng_counter_client_percpu_32_modular_init(void)
  81 {
  82         lttng_counter_transport_register(&lttng_counter_transport);
  83 }
  84
  85 void lttng_counter_client_percpu_32_modular_exit(void)
  86 {
  87         lttng_counter_transport_unregister(&lttng_counter_transport);
  88 }