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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
79150a49 JD |
3 | * lttng-context-need-reschedule.c |
4 | * | |
5 | * LTTng need_reschedule context. | |
6 | * | |
7 | * Copyright (C) 2009-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
79150a49 JD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/irqflags.h> | |
241ae9a8 MD |
14 | #include <lttng-events.h> |
15 | #include <wrapper/ringbuffer/frontend_types.h> | |
241ae9a8 | 16 | #include <lttng-tracer.h> |
79150a49 JD |
17 | |
18 | static | |
19 | size_t need_reschedule_get_size(size_t offset) | |
20 | { | |
21 | size_t size = 0; | |
22 | ||
23 | size += lib_ring_buffer_align(offset, lttng_alignof(uint8_t)); | |
24 | size += sizeof(uint8_t); | |
25 | return size; | |
26 | } | |
27 | ||
28 | static | |
29 | void need_reschedule_record(struct lttng_ctx_field *field, | |
30 | struct lib_ring_buffer_ctx *ctx, | |
31 | struct lttng_channel *chan) | |
32 | { | |
33 | uint8_t need_reschedule = test_tsk_need_resched(current); | |
34 | ||
35 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(need_reschedule)); | |
36 | chan->ops->event_write(ctx, &need_reschedule, sizeof(need_reschedule)); | |
37 | } | |
38 | ||
39 | static | |
40 | void need_reschedule_get_value(struct lttng_ctx_field *field, | |
41 | struct lttng_probe_ctx *lttng_probe_ctx, | |
42 | union lttng_ctx_value *value) | |
43 | { | |
44 | value->s64 = test_tsk_need_resched(current);; | |
45 | } | |
46 | ||
47 | int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx) | |
48 | { | |
49 | struct lttng_ctx_field *field; | |
50 | ||
51 | field = lttng_append_context(ctx); | |
52 | if (!field) | |
53 | return -ENOMEM; | |
54 | if (lttng_find_context(*ctx, "need_reschedule")) { | |
55 | lttng_remove_context_field(ctx, field); | |
56 | return -EEXIST; | |
57 | } | |
58 | field->event_field.name = "need_reschedule"; | |
59 | field->event_field.type.atype = atype_integer; | |
ceabb767 MD |
60 | field->event_field.type.u.integer.size = sizeof(uint8_t) * CHAR_BIT; |
61 | field->event_field.type.u.integer.alignment = lttng_alignof(uint8_t) * CHAR_BIT; | |
62 | field->event_field.type.u.integer.signedness = lttng_is_signed_type(uint8_t); | |
63 | field->event_field.type.u.integer.reverse_byte_order = 0; | |
64 | field->event_field.type.u.integer.base = 10; | |
65 | field->event_field.type.u.integer.encoding = lttng_encode_none; | |
79150a49 JD |
66 | field->get_size = need_reschedule_get_size; |
67 | field->record = need_reschedule_record; | |
68 | field->get_value = need_reschedule_get_value; | |
69 | lttng_context_update(*ctx); | |
79150a49 JD |
70 | return 0; |
71 | } | |
72 | EXPORT_SYMBOL_GPL(lttng_add_need_reschedule_to_ctx); |