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a101fa10 MD |
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 <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_64_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-64-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(<tng_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(<tng_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); |