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
)
51 * TODO: when we eventually add RCU subsystem instrumentation,
52 * taking the rcu read lock here will trigger RCU tracing
53 * recursively. We should modify the kernel synchronization so
54 * it synchronizes both for RCU and RCU sched, and rely on
55 * rcu_read_lock_sched_notrace.
59 ppid
= task_tgid_nr(current
->real_parent
);
61 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(ppid
));
62 chan
->ops
->event_write(ctx
, &ppid
, sizeof(ppid
));
65 int lttng_add_ppid_to_ctx(struct lttng_ctx
**ctx
)
67 struct lttng_ctx_field
*field
;
69 field
= lttng_append_context(ctx
);
72 if (lttng_find_context(*ctx
, "ppid")) {
73 lttng_remove_context_field(ctx
, field
);
76 field
->event_field
.name
= "ppid";
77 field
->event_field
.type
.atype
= atype_integer
;
78 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
79 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(pid_t
) * CHAR_BIT
;
80 field
->event_field
.type
.u
.basic
.integer
.signedness
= lttng_is_signed_type(pid_t
);
81 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
82 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
83 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
84 field
->get_size
= ppid_get_size
;
85 field
->record
= ppid_record
;
86 wrapper_vmalloc_sync_all();
89 EXPORT_SYMBOL_GPL(lttng_add_ppid_to_ctx
);
91 MODULE_LICENSE("GPL and additional rights");
92 MODULE_AUTHOR("Mathieu Desnoyers");
93 MODULE_DESCRIPTION("Linux Trace Toolkit PPID Context");
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