6 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/sched.h>
26 #include "lttng-events.h"
27 #include "wrapper/ringbuffer/frontend_types.h"
28 #include "wrapper/vmalloc.h"
29 #include "lttng-tracer.h"
32 size_t vtid_get_size(size_t offset
)
36 size
+= lib_ring_buffer_align(offset
, lttng_alignof(pid_t
));
37 size
+= sizeof(pid_t
);
42 void vtid_record(struct lttng_ctx_field
*field
,
43 struct lib_ring_buffer_ctx
*ctx
,
44 struct lttng_channel
*chan
)
49 * nsproxy can be NULL when scheduled out of exit.
51 if (!current
->nsproxy
)
54 vtid
= task_pid_vnr(current
);
55 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(vtid
));
56 chan
->ops
->event_write(ctx
, &vtid
, sizeof(vtid
));
59 int lttng_add_vtid_to_ctx(struct lttng_ctx
**ctx
)
61 struct lttng_ctx_field
*field
;
63 field
= lttng_append_context(ctx
);
66 if (lttng_find_context(*ctx
, "vtid")) {
67 lttng_remove_context_field(ctx
, field
);
70 field
->event_field
.name
= "vtid";
71 field
->event_field
.type
.atype
= atype_integer
;
72 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
73 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(pid_t
) * CHAR_BIT
;
74 field
->event_field
.type
.u
.basic
.integer
.signedness
= is_signed_type(pid_t
);
75 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
76 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
77 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
78 field
->get_size
= vtid_get_size
;
79 field
->record
= vtid_record
;
80 wrapper_vmalloc_sync_all();
83 EXPORT_SYMBOL_GPL(lttng_add_vtid_to_ctx
);
85 MODULE_LICENSE("GPL and additional rights");
86 MODULE_AUTHOR("Mathieu Desnoyers");
87 MODULE_DESCRIPTION("Linux Trace Toolkit vTID Context");
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