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 <linux/syscalls.h>
27 #include <lttng-events.h>
28 #include <wrapper/ringbuffer/frontend_types.h>
29 #include <wrapper/vmalloc.h>
30 #include <lttng-tracer.h>
33 size_t ppid_get_size(size_t offset
)
37 size
+= lib_ring_buffer_align(offset
, lttng_alignof(pid_t
));
38 size
+= sizeof(pid_t
);
43 void ppid_record(struct lttng_ctx_field
*field
,
44 struct lib_ring_buffer_ctx
*ctx
,
45 struct lttng_channel
*chan
)
50 * TODO: when we eventually add RCU subsystem instrumentation,
51 * taking the rcu read lock here will trigger RCU tracing
52 * recursively. We should modify the kernel synchronization so
53 * it synchronizes both for RCU and RCU sched, and rely on
54 * rcu_read_lock_sched_notrace.
57 ppid
= task_tgid_nr(current
->real_parent
);
59 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(ppid
));
60 chan
->ops
->event_write(ctx
, &ppid
, sizeof(ppid
));
64 void ppid_get_value(struct lttng_ctx_field
*field
,
65 struct lttng_probe_ctx
*lttng_probe_ctx
,
66 union lttng_ctx_value
*value
)
71 * TODO: when we eventually add RCU subsystem instrumentation,
72 * taking the rcu read lock here will trigger RCU tracing
73 * recursively. We should modify the kernel synchronization so
74 * it synchronizes both for RCU and RCU sched, and rely on
75 * rcu_read_lock_sched_notrace.
78 ppid
= task_tgid_nr(current
->real_parent
);
83 int lttng_add_ppid_to_ctx(struct lttng_ctx
**ctx
)
85 struct lttng_ctx_field
*field
;
87 field
= lttng_append_context(ctx
);
90 if (lttng_find_context(*ctx
, "ppid")) {
91 lttng_remove_context_field(ctx
, field
);
94 field
->event_field
.name
= "ppid";
95 field
->event_field
.type
.atype
= atype_integer
;
96 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
97 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(pid_t
) * CHAR_BIT
;
98 field
->event_field
.type
.u
.basic
.integer
.signedness
= lttng_is_signed_type(pid_t
);
99 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
100 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
101 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
102 field
->get_size
= ppid_get_size
;
103 field
->record
= ppid_record
;
104 field
->get_value
= ppid_get_value
;
105 lttng_context_update(*ctx
);
106 wrapper_vmalloc_sync_all();
109 EXPORT_SYMBOL_GPL(lttng_add_ppid_to_ctx
);
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