-/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
- *
- * lttng-context-need-reschedule.c
- *
- * LTTng need_reschedule context.
- *
- * Copyright (C) 2009-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
-
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/irqflags.h>
-#include <lttng-events.h>
-#include <wrapper/ringbuffer/frontend_types.h>
-#include <wrapper/vmalloc.h>
-#include <lttng-tracer.h>
-
-static
-size_t need_reschedule_get_size(size_t offset)
-{
- size_t size = 0;
-
- size += lib_ring_buffer_align(offset, lttng_alignof(uint8_t));
- size += sizeof(uint8_t);
- return size;
-}
-
-static
-void need_reschedule_record(struct lttng_ctx_field *field,
- struct lib_ring_buffer_ctx *ctx,
- struct lttng_channel *chan)
-{
- uint8_t need_reschedule = test_tsk_need_resched(current);
-
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(need_reschedule));
- chan->ops->event_write(ctx, &need_reschedule, sizeof(need_reschedule));
-}
-
-static
-void need_reschedule_get_value(struct lttng_ctx_field *field,
- struct lttng_probe_ctx *lttng_probe_ctx,
- union lttng_ctx_value *value)
-{
- value->s64 = test_tsk_need_resched(current);;
-}
-
-int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx)
-{
- struct lttng_ctx_field *field;
-
- field = lttng_append_context(ctx);
- if (!field)
- return -ENOMEM;
- if (lttng_find_context(*ctx, "need_reschedule")) {
- lttng_remove_context_field(ctx, field);
- return -EEXIST;
- }
- field->event_field.name = "need_reschedule";
- field->event_field.type.atype = atype_integer;
- field->event_field.type.u.integer.size = sizeof(uint8_t) * CHAR_BIT;
- field->event_field.type.u.integer.alignment = lttng_alignof(uint8_t) * CHAR_BIT;
- field->event_field.type.u.integer.signedness = lttng_is_signed_type(uint8_t);
- field->event_field.type.u.integer.reverse_byte_order = 0;
- field->event_field.type.u.integer.base = 10;
- field->event_field.type.u.integer.encoding = lttng_encode_none;
- field->get_size = need_reschedule_get_size;
- field->record = need_reschedule_record;
- field->get_value = need_reschedule_get_value;
- lttng_context_update(*ctx);
- wrapper_vmalloc_sync_mappings();
- return 0;
-}
-EXPORT_SYMBOL_GPL(lttng_add_need_reschedule_to_ctx);