+++ /dev/null
-/*
- * (C) Copyright 2009-2011 -
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * LTTng priority context.
- *
- * Dual LGPL v2.1/GPL v2 license.
- */
-
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include "ltt-events.h"
-#include "wrapper/ringbuffer/frontend_types.h"
-#include "wrapper/vmalloc.h"
-#include "ltt-tracer.h"
-
-static
-int (*wrapper_task_prio_sym)(struct task_struct *t);
-
-int wrapper_task_prio_init(void)
-{
- wrapper_task_prio_sym = (void *) kallsyms_lookup_name("task_prio");
- if (!wrapper_task_prio_sym) {
- printk(KERN_WARNING "LTTng: task_prio symbol lookup failed.\n");
- return -EINVAL;
- }
- return 0;
-}
-
-static
-size_t prio_get_size(size_t offset)
-{
- size_t size = 0;
-
- size += lib_ring_buffer_align(offset, ltt_alignof(int));
- size += sizeof(int);
- return size;
-}
-
-static
-void prio_record(struct lttng_ctx_field *field,
- struct lib_ring_buffer_ctx *ctx,
- struct ltt_channel *chan)
-{
- int prio;
-
- prio = wrapper_task_prio_sym(current);
- lib_ring_buffer_align_ctx(ctx, ltt_alignof(prio));
- chan->ops->event_write(ctx, &prio, sizeof(prio));
-}
-
-int lttng_add_prio_to_ctx(struct lttng_ctx **ctx)
-{
- struct lttng_ctx_field *field;
- int ret;
-
- if (!wrapper_task_prio_sym) {
- ret = wrapper_task_prio_init();
- if (ret)
- return ret;
- }
-
- field = lttng_append_context(ctx);
- if (!field)
- return -ENOMEM;
- field->event_field.name = "prio";
- field->event_field.type.atype = atype_integer;
- field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT;
- field->event_field.type.u.basic.integer.alignment = ltt_alignof(int) * CHAR_BIT;
- field->event_field.type.u.basic.integer.signedness = is_signed_type(int);
- field->event_field.type.u.basic.integer.reverse_byte_order = 0;
- field->event_field.type.u.basic.integer.base = 10;
- field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
- field->get_size = prio_get_size;
- field->record = prio_record;
- wrapper_vmalloc_sync_all();
- return 0;
-}
-EXPORT_SYMBOL_GPL(lttng_add_prio_to_ctx);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Priority Context");