src/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 overflow
   6  * arithmetic.
   7  *
   8  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <lttng/tracer.h>
  13 #include <counter/counter.h>
  14 #include <counter/counter-api.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 {
  27         return lttng_counter_create(&client_config, nr_dimensions, max_nr_elem,
  28                                     global_sum_step);
  29 }
  30
  31 static void counter_destroy(struct lib_counter *counter)
  32 {
  33         return lttng_counter_destroy(counter);
  34 }
  35
  36 static int counter_add(struct lib_counter *counter, const size_t *dimension_indexes, int64_t v)
  37 {
  38         return lttng_counter_add(&client_config, counter, dimension_indexes, v);
  39 }
  40
  41 static int counter_read(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
  42                         int64_t *value, bool *overflow, bool *underflow)
  43 {
  44         return lttng_counter_read(&client_config, counter, dimension_indexes, cpu, value,
  45                                   overflow, underflow);
  46 }
  47
  48 static int counter_aggregate(struct lib_counter *counter, const size_t *dimension_indexes,
  49                              int64_t *value, bool *overflow, bool *underflow)
  50 {
  51         return lttng_counter_aggregate(&client_config, counter, dimension_indexes, value,
  52                                        overflow, underflow);
  53 }
  54
  55 static int counter_clear(struct lib_counter *counter, const size_t *dimension_indexes)
  56 {
  57         return lttng_counter_clear(&client_config, counter, dimension_indexes);
  58 }
  59
  60 static struct lttng_counter_transport lttng_counter_transport = {
  61         .name = "counter-per-cpu-32-modular",
  62         .owner = THIS_MODULE,
  63         .ops = {
  64                 .counter_create = counter_create,
  65                 .counter_destroy = counter_destroy,
  66                 .counter_add = counter_add,
  67                 .counter_read = counter_read,
  68                 .counter_aggregate = counter_aggregate,
  69                 .counter_clear = counter_clear,
  70         },
  71 };
  72
  73 static int __init lttng_counter_client_init(void)
  74 {
  75         /*
  76          * This vmalloc sync all also takes care of the lib counter
  77          * vmalloc'd module pages when it is built as a module into LTTng.
  78          */
  79         wrapper_vmalloc_sync_mappings();
  80         lttng_counter_transport_register(&lttng_counter_transport);
  81         return 0;
  82 }
  83
  84 module_init(lttng_counter_client_init);
  85
  86 static void __exit lttng_counter_client_exit(void)
  87 {
  88         lttng_counter_transport_unregister(&lttng_counter_transport);
  89 }
  90
  91 module_exit(lttng_counter_client_exit);
  92
  93 MODULE_LICENSE("GPL and additional rights");
  94 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
  95 MODULE_DESCRIPTION("LTTng counter per-cpu 32-bit overflow client");
  96 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
  97         __stringify(LTTNG_MODULES_MINOR_VERSION) "."
  98         __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
  99         LTTNG_MODULES_EXTRAVERSION);