projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| 2df37e95 | 14 | #include <lttng/events.h> |
| 24591303 | 15 | #include <ringbuffer/frontend_types.h> |
| 241ae9a8 | 16 | #include <wrapper/vmalloc.h> |
| 2df37e95 | 17 | #include <lttng/tracer.h> |
| 79150a49 JD |
18 | |
| 19 | static | |
| 20 | size_t need_reschedule_get_size(size_t offset) | |
| 21 | { | |
| 22 | size_t size = 0; | |
| 23 | ||
| 24 | size += lib_ring_buffer_align(offset, lttng_alignof(uint8_t)); | |
| 25 | size += sizeof(uint8_t); | |
| 26 | return size; | |
| 27 | } | |
| 28 | ||
| 29 | static | |
| 30 | void need_reschedule_record(struct lttng_ctx_field *field, | |
| 31 | struct lib_ring_buffer_ctx *ctx, | |
| 32 | struct lttng_channel *chan) | |
| 33 | { | |
| 34 | uint8_t need_reschedule = test_tsk_need_resched(current); | |
| 35 | ||
| 36 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(need_reschedule)); | |
| 37 | chan->ops->event_write(ctx, &need_reschedule, sizeof(need_reschedule)); | |
| 38 | } | |
| 39 | ||
| 40 | static | |
| 41 | void need_reschedule_get_value(struct lttng_ctx_field *field, | |
| 42 | struct lttng_probe_ctx *lttng_probe_ctx, | |
| 43 | union lttng_ctx_value *value) | |
| 44 | { | |
| 45 | value->s64 = test_tsk_need_resched(current);; | |
| 46 | } | |
| 47 | ||
| 48 | int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx) | |
| 49 | { | |
| 50 | struct lttng_ctx_field *field; | |
| 51 | ||
| 52 | field = lttng_append_context(ctx); | |
| 53 | if (!field) | |
| 54 | return -ENOMEM; | |
| 55 | if (lttng_find_context(*ctx, "need_reschedule")) { | |
| 56 | lttng_remove_context_field(ctx, field); | |
| 57 | return -EEXIST; | |
| 58 | } | |
| 59 | field->event_field.name = "need_reschedule"; | |
| 60 | field->event_field.type.atype = atype_integer; | |
| ceabb767 MD |
61 | field->event_field.type.u.integer.size = sizeof(uint8_t) * CHAR_BIT; |
| 62 | field->event_field.type.u.integer.alignment = lttng_alignof(uint8_t) * CHAR_BIT; | |
| 63 | field->event_field.type.u.integer.signedness = lttng_is_signed_type(uint8_t); | |
| 64 | field->event_field.type.u.integer.reverse_byte_order = 0; | |
| 65 | field->event_field.type.u.integer.base = 10; | |
| 66 | field->event_field.type.u.integer.encoding = lttng_encode_none; | |
| 79150a49 JD |
67 | field->get_size = need_reschedule_get_size; |
| 68 | field->record = need_reschedule_record; | |
| 69 | field->get_value = need_reschedule_get_value; | |
| 70 | lttng_context_update(*ctx); | |
| 263b6c88 | 71 | wrapper_vmalloc_sync_mappings(); |
| 79150a49 JD |
72 | return 0; |
| 73 | } | |
| 74 | EXPORT_SYMBOL_GPL(lttng_add_need_reschedule_to_ctx); |