-/*
- * (C) Copyright 2009-2011 -
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * lttng-context-prio.c
*
* LTTng priority context.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#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"
+#include <lttng-events.h>
+#include <wrapper/ringbuffer/frontend_types.h>
+#include <wrapper/vmalloc.h>
+#include <wrapper/kallsyms.h>
+#include <lttng-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_funcptr("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 += lib_ring_buffer_align(offset, lttng_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)
+ struct lttng_channel *chan)
{
int prio;
- prio = task_prio(current);
- lib_ring_buffer_align_ctx(ctx, ltt_alignof(prio));
+ prio = wrapper_task_prio_sym(current);
+ lib_ring_buffer_align_ctx(ctx, lttng_alignof(prio));
chan->ops->event_write(ctx, &prio, sizeof(prio));
}
+static
+void prio_get_value(struct lttng_ctx_field *field,
+ struct lttng_probe_ctx *lttng_probe_ctx,
+ union lttng_ctx_value *value)
+{
+ value->s64 = wrapper_task_prio_sym(current);
+}
+
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 ret;
+ return -ENOMEM;
+ if (lttng_find_context(*ctx, "prio")) {
+ lttng_remove_context_field(ctx, field);
+ return -EEXIST;
+ }
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->event_field.type.u.integer.size = sizeof(int) * CHAR_BIT;
+ field->event_field.type.u.integer.alignment = lttng_alignof(int) * CHAR_BIT;
+ field->event_field.type.u.integer.signedness = lttng_is_signed_type(int);
+ 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 = prio_get_size;
field->record = prio_record;
+ field->get_value = prio_get_value;
+ lttng_context_update(*ctx);
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");