2 * (C) Copyright 2009-2011 -
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * LTTng priority context.
7 * Dual LGPL v2.1/GPL v2 license.
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/sched.h>
13 #include "ltt-events.h"
14 #include "wrapper/ringbuffer/frontend_types.h"
15 #include "wrapper/vmalloc.h"
16 #include "wrapper/kallsyms.h"
17 #include "ltt-tracer.h"
20 int (*wrapper_task_prio_sym
)(struct task_struct
*t
);
22 int wrapper_task_prio_init(void)
24 wrapper_task_prio_sym
= (void *) kallsyms_lookup_funcptr("task_prio");
25 if (!wrapper_task_prio_sym
) {
26 printk(KERN_WARNING
"LTTng: task_prio symbol lookup failed.\n");
33 size_t prio_get_size(size_t offset
)
37 size
+= lib_ring_buffer_align(offset
, ltt_alignof(int));
43 void prio_record(struct lttng_ctx_field
*field
,
44 struct lib_ring_buffer_ctx
*ctx
,
45 struct ltt_channel
*chan
)
49 prio
= wrapper_task_prio_sym(current
);
50 lib_ring_buffer_align_ctx(ctx
, ltt_alignof(prio
));
51 chan
->ops
->event_write(ctx
, &prio
, sizeof(prio
));
54 int lttng_add_prio_to_ctx(struct lttng_ctx
**ctx
)
56 struct lttng_ctx_field
*field
;
59 if (!wrapper_task_prio_sym
) {
60 ret
= wrapper_task_prio_init();
65 field
= lttng_append_context(ctx
);
68 if (lttng_find_context(*ctx
, "prio")) {
69 lttng_remove_context_field(ctx
, field
);
72 field
->event_field
.name
= "prio";
73 field
->event_field
.type
.atype
= atype_integer
;
74 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(int) * CHAR_BIT
;
75 field
->event_field
.type
.u
.basic
.integer
.alignment
= ltt_alignof(int) * CHAR_BIT
;
76 field
->event_field
.type
.u
.basic
.integer
.signedness
= is_signed_type(int);
77 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
78 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
79 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
80 field
->get_size
= prio_get_size
;
81 field
->record
= prio_record
;
82 wrapper_vmalloc_sync_all();
85 EXPORT_SYMBOL_GPL(lttng_add_prio_to_ctx
);
87 MODULE_LICENSE("GPL and additional rights");
88 MODULE_AUTHOR("Mathieu Desnoyers");
89 MODULE_DESCRIPTION("Linux Trace Toolkit Priority Context");
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