projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 53f1f0ca MD |
1 | /* |
| 2 | * (C) Copyright 2009-2011 - | |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 4 | * | |
| 5 | * LTTng nice 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" |
| 53f1f0ca MD |
14 | #include "wrapper/ringbuffer/frontend_types.h" |
| 15 | #include "wrapper/vmalloc.h" | |
| a90917c3 | 16 | #include "lttng-tracer.h" |
| 53f1f0ca MD |
17 | |
| 18 | static | |
| 19 | size_t nice_get_size(size_t offset) | |
| 20 | { | |
| 21 | size_t size = 0; | |
| 22 | ||
| a90917c3 | 23 | size += lib_ring_buffer_align(offset, lttng_alignof(int)); |
| 53f1f0ca MD |
24 | size += sizeof(int); |
| 25 | return size; | |
| 26 | } | |
| 27 | ||
| 28 | static | |
| 29 | void nice_record(struct lttng_ctx_field *field, | |
| 30 | struct lib_ring_buffer_ctx *ctx, | |
| a90917c3 | 31 | struct lttng_channel *chan) |
| 53f1f0ca MD |
32 | { |
| 33 | int nice; | |
| 34 | ||
| 35 | nice = task_nice(current); | |
| a90917c3 | 36 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(nice)); |
| 53f1f0ca MD |
37 | chan->ops->event_write(ctx, &nice, sizeof(nice)); |
| 38 | } | |
| 39 | ||
| 40 | int lttng_add_nice_to_ctx(struct lttng_ctx **ctx) | |
| 41 | { | |
| 42 | struct lttng_ctx_field *field; | |
| 53f1f0ca MD |
43 | |
| 44 | field = lttng_append_context(ctx); | |
| 45 | if (!field) | |
| 09fec6b4 | 46 | return -ENOMEM; |
| 44252f0f MD |
47 | if (lttng_find_context(*ctx, "nice")) { |
| 48 | lttng_remove_context_field(ctx, field); | |
| 49 | return -EEXIST; | |
| 50 | } | |
| 53f1f0ca MD |
51 | field->event_field.name = "nice"; |
| 52 | field->event_field.type.atype = atype_integer; | |
| 53 | field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT; | |
| a90917c3 | 54 | field->event_field.type.u.basic.integer.alignment = lttng_alignof(int) * CHAR_BIT; |
| 53f1f0ca MD |
55 | field->event_field.type.u.basic.integer.signedness = is_signed_type(int); |
| 56 | field->event_field.type.u.basic.integer.reverse_byte_order = 0; | |
| 57 | field->event_field.type.u.basic.integer.base = 10; | |
| 58 | field->event_field.type.u.basic.integer.encoding = lttng_encode_none; | |
| 59 | field->get_size = nice_get_size; | |
| 60 | field->record = nice_record; | |
| 61 | wrapper_vmalloc_sync_all(); | |
| 62 | return 0; | |
| 63 | } | |
| 64 | EXPORT_SYMBOL_GPL(lttng_add_nice_to_ctx); | |
| 65 | ||
| 66 | MODULE_LICENSE("GPL and additional rights"); | |
| 67 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
| 68 | MODULE_DESCRIPTION("Linux Trace Toolkit Nice Context"); |