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 vtid_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 vtid_record(void *priv
, struct lttng_kernel_probe_ctx
*probe_ctx
,
31 struct lib_ring_buffer_ctx
*ctx
,
32 struct lttng_channel
*chan
)
37 * nsproxy can be NULL when scheduled out of exit.
39 if (!current
->nsproxy
)
42 vtid
= task_pid_vnr(current
);
43 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(vtid
));
44 chan
->ops
->event_write(ctx
, &vtid
, sizeof(vtid
));
48 void vtid_get_value(void *priv
,
49 struct lttng_kernel_probe_ctx
*lttng_probe_ctx
,
50 struct lttng_ctx_value
*value
)
55 * nsproxy can be NULL when scheduled out of exit.
57 if (!current
->nsproxy
)
60 vtid
= task_pid_vnr(current
);
64 static const struct lttng_kernel_ctx_field
*ctx_field
= lttng_kernel_static_ctx_field(
65 lttng_kernel_static_event_field("vtid",
66 lttng_kernel_static_type_integer_from_type(pid_t
, __BYTE_ORDER
, 10),
73 int lttng_add_vtid_to_ctx(struct lttng_kernel_ctx
**ctx
)
77 if (lttng_kernel_find_context(*ctx
, ctx_field
->event_field
->name
))
79 ret
= lttng_kernel_context_append(ctx
, ctx_field
);
80 wrapper_vmalloc_sync_mappings();
83 EXPORT_SYMBOL_GPL(lttng_add_vtid_to_ctx
);
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