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 <lttng/events.h>
14 #include <lttng/events-internal.h>
15 #include <ringbuffer/frontend_types.h>
16 #include <wrapper/vmalloc.h>
17 #include <lttng/tracer.h>
20 size_t tid_get_size(void *priv
, struct lttng_kernel_probe_ctx
*probe_ctx
, size_t offset
)
24 size
+= lib_ring_buffer_align(offset
, lttng_alignof(pid_t
));
25 size
+= sizeof(pid_t
);
30 void tid_record(void *priv
, struct lttng_kernel_probe_ctx
*probe_ctx
,
31 struct lttng_kernel_ring_buffer_ctx
*ctx
,
32 struct lttng_kernel_channel_buffer
*chan
)
36 tid
= task_pid_nr(current
);
37 chan
->ops
->event_write(ctx
, &tid
, sizeof(tid
), lttng_alignof(tid
));
41 void tid_get_value(void *priv
,
42 struct lttng_kernel_probe_ctx
*lttng_probe_ctx
,
43 struct lttng_ctx_value
*value
)
47 tid
= task_pid_nr(current
);
51 static const struct lttng_kernel_ctx_field
*ctx_field
= lttng_kernel_static_ctx_field(
52 lttng_kernel_static_event_field("tid",
53 lttng_kernel_static_type_integer_from_type(pid_t
, __BYTE_ORDER
, 10),
60 int lttng_add_tid_to_ctx(struct lttng_kernel_ctx
**ctx
)
64 if (lttng_kernel_find_context(*ctx
, ctx_field
->event_field
->name
))
66 ret
= lttng_kernel_context_append(ctx
, ctx_field
);
67 wrapper_vmalloc_sync_mappings();
70 EXPORT_SYMBOL_GPL(lttng_add_tid_to_ctx
);