1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
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 <lttng-tracer.h>
19 size_t vtid_get_size(size_t offset
)
23 size
+= lib_ring_buffer_align(offset
, lttng_alignof(pid_t
));
24 size
+= sizeof(pid_t
);
29 void vtid_record(struct lttng_ctx_field
*field
,
30 struct lib_ring_buffer_ctx
*ctx
,
31 struct lttng_channel
*chan
)
36 * nsproxy can be NULL when scheduled out of exit.
38 if (!current
->nsproxy
)
41 vtid
= task_pid_vnr(current
);
42 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(vtid
));
43 chan
->ops
->event_write(ctx
, &vtid
, sizeof(vtid
));
47 void vtid_get_value(struct lttng_ctx_field
*field
,
48 struct lttng_probe_ctx
*lttng_probe_ctx
,
49 union lttng_ctx_value
*value
)
54 * nsproxy can be NULL when scheduled out of exit.
56 if (!current
->nsproxy
)
59 vtid
= task_pid_vnr(current
);
63 int lttng_add_vtid_to_ctx(struct lttng_ctx
**ctx
)
65 struct lttng_ctx_field
*field
;
67 field
= lttng_append_context(ctx
);
70 if (lttng_find_context(*ctx
, "vtid")) {
71 lttng_remove_context_field(ctx
, field
);
74 field
->event_field
.name
= "vtid";
75 field
->event_field
.type
.atype
= atype_integer
;
76 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
77 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(pid_t
) * CHAR_BIT
;
78 field
->event_field
.type
.u
.basic
.integer
.signedness
= lttng_is_signed_type(pid_t
);
79 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
80 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
81 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
82 field
->get_size
= vtid_get_size
;
83 field
->record
= vtid_record
;
84 field
->get_value
= vtid_get_value
;
85 lttng_context_update(*ctx
);
86 wrapper_vmalloc_sync_all();
89 EXPORT_SYMBOL_GPL(lttng_add_vtid_to_ctx
);
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