From 13edcd1d9b0b5df38312bbfd02b7d70b8fbb0702 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Thu, 11 Jun 2015 23:40:21 +0200 Subject: [PATCH] Implement cpu-id context Signed-off-by: Mathieu Desnoyers --- lttng-context-cpu-id.c | 95 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 lttng-context-cpu-id.c diff --git a/lttng-context-cpu-id.c b/lttng-context-cpu-id.c new file mode 100644 index 00000000..dd60b199 --- /dev/null +++ b/lttng-context-cpu-id.c @@ -0,0 +1,95 @@ +/* + * lttng-context-cpu-id.c + * + * LTTng CPU id context. + * + * Copyright (C) 2009-2012 Mathieu Desnoyers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; only + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include +#include "lttng-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "lttng-tracer.h" + +static +size_t cpu_id_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, lttng_alignof(cycles_t)); + size += sizeof(cycles_t); + return size; +} + +static +void cpu_id_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct lttng_channel *chan) +{ + cycles_t cpu; + + cpu = ctx->cpu; + lib_ring_buffer_align_ctx(ctx, lttng_alignof(cpu)); + chan->ops->event_write(ctx, &cpu, sizeof(cpu)); +} + +static +void cpu_id_get_value(struct lttng_ctx_field *field, + union lttng_ctx_value *value) +{ + value->s64 = smp_processor_id(); +} + +int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "cpu_id")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "cpu_id"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(cycles_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = lttng_alignof(cycles_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(cycles_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = cpu_id_get_size; + field->record = cpu_id_record; + field->get_value = cpu_id_get_value; + lttng_context_update(*ctx); + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_cpu_id_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit CPU id Context"); +MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." + __stringify(LTTNG_MODULES_MINOR_VERSION) "." + __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) + LTTNG_MODULES_EXTRAVERSION); -- 2.34.1