projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| b64bc438 MD |
1 | /* |
| 2 | * (C) Copyright 2009-2011 - | |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 4 | * | |
| 5 | * LTTng vTID context. | |
| 6 | * | |
| 7 | * Dual LGPL v2.1/GPL v2 license. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/module.h> | |
| 11 | #include <linux/slab.h> | |
| 12 | #include <linux/sched.h> | |
| a90917c3 | 13 | #include "lttng-events.h" |
| b64bc438 MD |
14 | #include "wrapper/ringbuffer/frontend_types.h" |
| 15 | #include "wrapper/vmalloc.h" | |
| a90917c3 | 16 | #include "lttng-tracer.h" |
| b64bc438 MD |
17 | |
| 18 | static | |
| 19 | size_t vtid_get_size(size_t offset) | |
| 20 | { | |
| 21 | size_t size = 0; | |
| 22 | ||
| a90917c3 | 23 | size += lib_ring_buffer_align(offset, lttng_alignof(pid_t)); |
| b64bc438 MD |
24 | size += sizeof(pid_t); |
| 25 | return size; | |
| 26 | } | |
| 27 | ||
| 28 | static | |
| 29 | void vtid_record(struct lttng_ctx_field *field, | |
| 30 | struct lib_ring_buffer_ctx *ctx, | |
| a90917c3 | 31 | struct lttng_channel *chan) |
| b64bc438 MD |
32 | { |
| 33 | pid_t vtid; | |
| 34 | ||
| 90f96adf MD |
35 | /* |
| 36 | * nsproxy can be NULL when scheduled out of exit. | |
| 37 | */ | |
| 38 | if (!current->nsproxy) | |
| 39 | vtid = 0; | |
| 40 | else | |
| 41 | vtid = task_pid_vnr(current); | |
| a90917c3 | 42 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(vtid)); |
| b64bc438 MD |
43 | chan->ops->event_write(ctx, &vtid, sizeof(vtid)); |
| 44 | } | |
| 45 | ||
| 46 | int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx) | |
| 47 | { | |
| 48 | struct lttng_ctx_field *field; | |
| b64bc438 MD |
49 | |
| 50 | field = lttng_append_context(ctx); | |
| 51 | if (!field) | |
| 09fec6b4 | 52 | return -ENOMEM; |
| 44252f0f MD |
53 | if (lttng_find_context(*ctx, "vtid")) { |
| 54 | lttng_remove_context_field(ctx, field); | |
| 55 | return -EEXIST; | |
| 56 | } | |
| b64bc438 MD |
57 | field->event_field.name = "vtid"; |
| 58 | field->event_field.type.atype = atype_integer; | |
| 59 | field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; | |
| a90917c3 | 60 | field->event_field.type.u.basic.integer.alignment = lttng_alignof(pid_t) * CHAR_BIT; |
| b64bc438 MD |
61 | field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); |
| 62 | field->event_field.type.u.basic.integer.reverse_byte_order = 0; | |
| 63 | field->event_field.type.u.basic.integer.base = 10; | |
| 64 | field->event_field.type.u.basic.integer.encoding = lttng_encode_none; | |
| 65 | field->get_size = vtid_get_size; | |
| 66 | field->record = vtid_record; | |
| 67 | wrapper_vmalloc_sync_all(); | |
| 68 | return 0; | |
| 69 | } | |
| 70 | EXPORT_SYMBOL_GPL(lttng_add_vtid_to_ctx); | |
| 71 | ||
| 72 | MODULE_LICENSE("GPL and additional rights"); | |
| 73 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
| 74 | MODULE_DESCRIPTION("Linux Trace Toolkit vTID Context"); |