1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
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 <linux/syscalls.h>
14 #include <lttng-events.h>
15 #include <wrapper/ringbuffer/frontend_types.h>
16 #include <lttng-tracer.h>
19 size_t ppid_get_size(size_t offset
)
23 size
+= lib_ring_buffer_align(offset
, lttng_alignof(pid_t
));
24 size
+= sizeof(pid_t
);
29 void ppid_record(struct lttng_ctx_field
*field
,
30 struct lib_ring_buffer_ctx
*ctx
,
31 struct lttng_channel
*chan
)
36 * TODO: when we eventually add RCU subsystem instrumentation,
37 * taking the rcu read lock here will trigger RCU tracing
38 * recursively. We should modify the kernel synchronization so
39 * it synchronizes both for RCU and RCU sched, and rely on
40 * rcu_read_lock_sched_notrace.
43 ppid
= task_tgid_nr(current
->real_parent
);
45 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(ppid
));
46 chan
->ops
->event_write(ctx
, &ppid
, sizeof(ppid
));
50 void ppid_get_value(struct lttng_ctx_field
*field
,
51 struct lttng_probe_ctx
*lttng_probe_ctx
,
52 union lttng_ctx_value
*value
)
57 * TODO: when we eventually add RCU subsystem instrumentation,
58 * taking the rcu read lock here will trigger RCU tracing
59 * recursively. We should modify the kernel synchronization so
60 * it synchronizes both for RCU and RCU sched, and rely on
61 * rcu_read_lock_sched_notrace.
64 ppid
= task_tgid_nr(current
->real_parent
);
69 int lttng_add_ppid_to_ctx(struct lttng_ctx
**ctx
)
71 struct lttng_ctx_field
*field
;
73 field
= lttng_append_context(ctx
);
76 if (lttng_find_context(*ctx
, "ppid")) {
77 lttng_remove_context_field(ctx
, field
);
80 field
->event_field
.name
= "ppid";
81 field
->event_field
.type
.atype
= atype_integer
;
82 field
->event_field
.type
.u
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
83 field
->event_field
.type
.u
.integer
.alignment
= lttng_alignof(pid_t
) * CHAR_BIT
;
84 field
->event_field
.type
.u
.integer
.signedness
= lttng_is_signed_type(pid_t
);
85 field
->event_field
.type
.u
.integer
.reverse_byte_order
= 0;
86 field
->event_field
.type
.u
.integer
.base
= 10;
87 field
->event_field
.type
.u
.integer
.encoding
= lttng_encode_none
;
88 field
->get_size
= ppid_get_size
;
89 field
->record
= ppid_record
;
90 field
->get_value
= ppid_get_value
;
91 lttng_context_update(*ctx
);
94 EXPORT_SYMBOL_GPL(lttng_add_ppid_to_ctx
);
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