1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * LTTng priority context.
7 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/sched.h>
13 #include <lttng-events.h>
14 #include <wrapper/ringbuffer/frontend_types.h>
15 #include <wrapper/kallsyms.h>
16 #include <lttng-tracer.h>
19 int (*wrapper_task_prio_sym
)(struct task_struct
*t
);
21 int wrapper_task_prio_init(void)
23 wrapper_task_prio_sym
= (void *) kallsyms_lookup_funcptr("task_prio");
24 if (!wrapper_task_prio_sym
) {
25 printk(KERN_WARNING
"LTTng: task_prio symbol lookup failed.\n");
32 size_t prio_get_size(size_t offset
)
36 size
+= lib_ring_buffer_align(offset
, lttng_alignof(int));
42 void prio_record(struct lttng_ctx_field
*field
,
43 struct lib_ring_buffer_ctx
*ctx
,
44 struct lttng_channel
*chan
)
48 prio
= wrapper_task_prio_sym(current
);
49 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(prio
));
50 chan
->ops
->event_write(ctx
, &prio
, sizeof(prio
));
54 void prio_get_value(struct lttng_ctx_field
*field
,
55 struct lttng_probe_ctx
*lttng_probe_ctx
,
56 union lttng_ctx_value
*value
)
58 value
->s64
= wrapper_task_prio_sym(current
);
61 int lttng_add_prio_to_ctx(struct lttng_ctx
**ctx
)
63 struct lttng_ctx_field
*field
;
66 if (!wrapper_task_prio_sym
) {
67 ret
= wrapper_task_prio_init();
72 field
= lttng_append_context(ctx
);
75 if (lttng_find_context(*ctx
, "prio")) {
76 lttng_remove_context_field(ctx
, field
);
79 field
->event_field
.name
= "prio";
80 field
->event_field
.type
.atype
= atype_integer
;
81 field
->event_field
.type
.u
.integer
.size
= sizeof(int) * CHAR_BIT
;
82 field
->event_field
.type
.u
.integer
.alignment
= lttng_alignof(int) * CHAR_BIT
;
83 field
->event_field
.type
.u
.integer
.signedness
= lttng_is_signed_type(int);
84 field
->event_field
.type
.u
.integer
.reverse_byte_order
= 0;
85 field
->event_field
.type
.u
.integer
.base
= 10;
86 field
->event_field
.type
.u
.integer
.encoding
= lttng_encode_none
;
87 field
->get_size
= prio_get_size
;
88 field
->record
= prio_record
;
89 field
->get_value
= prio_get_value
;
90 lttng_context_update(*ctx
);
93 EXPORT_SYMBOL_GPL(lttng_add_prio_to_ctx
);
This page took 0.031024 seconds and 4 git commands to generate.