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/*
* lttng-context-nice.c
*
* LTTng nice context.
*
* Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; only
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include "lttng-events.h"
#include "wrapper/ringbuffer/frontend_types.h"
#include "wrapper/vmalloc.h"
#include "lttng-tracer.h"

static
size_t nice_get_size(size_t offset)
{
size_t size = 0;

size += lib_ring_buffer_align(offset, lttng_alignof(int));
size += sizeof(int);
return size;
}

static
void nice_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
int nice;

nice = task_nice(current);
lib_ring_buffer_align_ctx(ctx, lttng_alignof(nice));
chan->ops->event_write(ctx, &nice, sizeof(nice));
}

int lttng_add_nice_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, "nice")) {
lttng_remove_context_field(ctx, field);
return -EEXIST;
}
field->event_field.name = "nice";
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 = lttng_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 = nice_get_size;
field->record = nice_record;
wrapper_vmalloc_sync_all();
return 0;
}
EXPORT_SYMBOL_GPL(lttng_add_nice_to_ctx);

MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Linux Trace Toolkit Nice Context");
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