src/lttng-counter-client-percpu-64-modular.c

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng-counter-client-percpu-64-modular.c
   4  *
   5  * LTTng lib counter client. Per-cpu 64-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 <lttng/events.h>
  14 #include <lttng/events-internal.h>
  15 #include <counter/counter.h>
  16 #include <counter/counter-api.h>
  17
  18 static const struct lib_counter_config client_config = {
  19         .alloc = COUNTER_ALLOC_PER_CPU,
  20         .sync = COUNTER_SYNC_PER_CPU,
  21         .arithmetic = COUNTER_ARITHMETIC_MODULAR,
  22         .counter_size = COUNTER_SIZE_64_BIT,
  23 };
  24
  25 static struct lib_counter *counter_create(size_t nr_dimensions,
  26                                           const size_t *max_nr_elem,
  27                                           int64_t global_sum_step)
  28 {
  29         return lttng_counter_create(&client_config, nr_dimensions, max_nr_elem,
  30                                     global_sum_step);
  31 }
  32
  33 static void counter_destroy(struct lib_counter *counter)
  34 {
  35         return lttng_counter_destroy(counter);
  36 }
  37
  38 static int counter_add(struct lib_counter *counter, const size_t *dimension_indexes, int64_t v)
  39 {
  40         return lttng_counter_add(&client_config, counter, dimension_indexes, v);
  41 }
  42
  43 static int counter_read(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
  44                         int64_t *value, bool *overflow, bool *underflow)
  45 {
  46         return lttng_counter_read(&client_config, counter, dimension_indexes, cpu, value,
  47                                   overflow, underflow);
  48 }
  49
  50 static int counter_aggregate(struct lib_counter *counter, const size_t *dimension_indexes,
  51                              int64_t *value, bool *overflow, bool *underflow)
  52 {
  53         return lttng_counter_aggregate(&client_config, counter, dimension_indexes, value,
  54                                        overflow, underflow);
  55 }
  56
  57 static int counter_clear(struct lib_counter *counter, const size_t *dimension_indexes)
  58 {
  59         return lttng_counter_clear(&client_config, counter, dimension_indexes);
  60 }
  61
  62 static struct lttng_counter_transport lttng_counter_transport = {
  63         .name = "counter-per-cpu-64-modular",
  64         .owner = THIS_MODULE,
  65         .ops = {
  66                 .counter_create = counter_create,
  67                 .counter_destroy = counter_destroy,
  68                 .counter_add = counter_add,
  69                 .counter_read = counter_read,
  70                 .counter_aggregate = counter_aggregate,
  71                 .counter_clear = counter_clear,
  72         },
  73 };
  74
  75 static int __init lttng_counter_client_init(void)
  76 {
  77         /*
  78          * This vmalloc sync all also takes care of the lib counter
  79          * vmalloc'd module pages when it is built as a module into LTTng.
  80          */
  81         wrapper_vmalloc_sync_mappings();
  82         lttng_counter_transport_register(&lttng_counter_transport);
  83         return 0;
  84 }
  85
  86 module_init(lttng_counter_client_init);
  87
  88 static void __exit lttng_counter_client_exit(void)
  89 {
  90         lttng_counter_transport_unregister(&lttng_counter_transport);
  91 }
  92
  93 module_exit(lttng_counter_client_exit);
  94
  95 MODULE_LICENSE("GPL and additional rights");
  96 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
  97 MODULE_DESCRIPTION("LTTng counter per-cpu 32-bit overflow client");
  98 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
  99         __stringify(LTTNG_MODULES_MINOR_VERSION) "."
 100         __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
 101         LTTNG_MODULES_EXTRAVERSION);