Fix: pid tracker should track "pgid"
[deliverable/lttng-modules.git] / lttng-context-migratable.c
CommitLineData
79150a49
JD
1/*
2 * lttng-context-migratable.c
3 *
4 * LTTng migratable context.
5 *
6 * Copyright (C) 2009-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 *
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.
12 *
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.
17 *
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
21 */
22
23#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/sched.h>
26#include <linux/irqflags.h>
241ae9a8
MD
27#include <lttng-events.h>
28#include <wrapper/ringbuffer/frontend_types.h>
29#include <wrapper/vmalloc.h>
30#include <lttng-tracer.h>
79150a49
JD
31
32static
33size_t migratable_get_size(size_t offset)
34{
35 size_t size = 0;
36
37 size += lib_ring_buffer_align(offset, lttng_alignof(uint8_t));
38 size += sizeof(uint8_t);
39 return size;
40}
41
42static
43void migratable_record(struct lttng_ctx_field *field,
44 struct lib_ring_buffer_ctx *ctx,
45 struct lttng_channel *chan)
46{
47 uint8_t migratable = !__migrate_disabled(current);
48
49 lib_ring_buffer_align_ctx(ctx, lttng_alignof(migratable));
50 chan->ops->event_write(ctx, &migratable, sizeof(migratable));
51}
52
53static
54void migratable_get_value(struct lttng_ctx_field *field,
55 struct lttng_probe_ctx *lttng_probe_ctx,
56 union lttng_ctx_value *value)
57{
58 value->s64 = !__migrate_disabled(current);
59}
60
61int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
62{
63 struct lttng_ctx_field *field;
64
65 field = lttng_append_context(ctx);
66 if (!field)
67 return -ENOMEM;
68 if (lttng_find_context(*ctx, "migratable")) {
69 lttng_remove_context_field(ctx, field);
70 return -EEXIST;
71 }
72 field->event_field.name = "migratable";
73 field->event_field.type.atype = atype_integer;
74 field->event_field.type.u.basic.integer.size = sizeof(uint8_t) * CHAR_BIT;
75 field->event_field.type.u.basic.integer.alignment = lttng_alignof(uint8_t) * CHAR_BIT;
76 field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(uint8_t);
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 = migratable_get_size;
81 field->record = migratable_record;
82 field->get_value = migratable_get_value;
83 lttng_context_update(*ctx);
84 wrapper_vmalloc_sync_all();
85 return 0;
86}
87EXPORT_SYMBOL_GPL(lttng_add_migratable_to_ctx);
This page took 0.027492 seconds and 5 git commands to generate.