1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
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/vmalloc.h>
16 #include <wrapper/kallsyms.h>
17 #include <lttng-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
, lttng_alignof(int));
43 void prio_record(struct lttng_ctx_field
*field
,
44 struct lib_ring_buffer_ctx
*ctx
,
45 struct lttng_channel
*chan
)
49 prio
= wrapper_task_prio_sym(current
);
50 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(prio
));
51 chan
->ops
->event_write(ctx
, &prio
, sizeof(prio
));
55 void prio_get_value(struct lttng_ctx_field
*field
,
56 struct lttng_probe_ctx
*lttng_probe_ctx
,
57 union lttng_ctx_value
*value
)
59 value
->s64
= wrapper_task_prio_sym(current
);
62 int lttng_add_prio_to_ctx(struct lttng_ctx
**ctx
)
64 struct lttng_ctx_field
*field
;
67 if (!wrapper_task_prio_sym
) {
68 ret
= wrapper_task_prio_init();
73 field
= lttng_append_context(ctx
);
76 if (lttng_find_context(*ctx
, "prio")) {
77 lttng_remove_context_field(ctx
, field
);
80 field
->event_field
.name
= "prio";
81 field
->event_field
.type
.atype
= atype_integer
;
82 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(int) * CHAR_BIT
;
83 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(int) * CHAR_BIT
;
84 field
->event_field
.type
.u
.basic
.integer
.signedness
= lttng_is_signed_type(int);
85 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
86 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
87 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
88 field
->get_size
= prio_get_size
;
89 field
->record
= prio_record
;
90 field
->get_value
= prio_get_value
;
91 lttng_context_update(*ctx
);
92 wrapper_vmalloc_sync_all();
95 EXPORT_SYMBOL_GPL(lttng_add_prio_to_ctx
);
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