X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;ds=sidebyside;f=lttng-context-nice.c;fp=lttng-context-nice.c;h=d7fafb9d3939af55615effcd8a44e0b4fe5cab67;hb=53f1f0ca4eb1890673992697c19e4e1507ec4ac5;hp=0000000000000000000000000000000000000000;hpb=a8ad3613f2e0e272487b8ec0f0ec8e3c6da689f9;p=lttng-modules.git

diff --git a/lttng-context-nice.c b/lttng-context-nice.c
new file mode 100644
index 00000000..d7fafb9d
--- /dev/null
+++ b/lttng-context-nice.c
@@ -0,0 +1,65 @@
+/*
+ * (C) Copyright	2009-2011 -
+ * 		Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * LTTng nice context.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include "ltt-events.h"
+#include "wrapper/ringbuffer/frontend_types.h"
+#include "wrapper/vmalloc.h"
+#include "ltt-tracer.h"
+
+static
+size_t nice_get_size(size_t offset)
+{
+	size_t size = 0;
+
+	size += lib_ring_buffer_align(offset, ltt_alignof(int));
+	size += sizeof(int);
+	return size;
+}
+
+static
+void nice_record(struct lttng_ctx_field *field,
+		struct lib_ring_buffer_ctx *ctx,
+		struct ltt_channel *chan)
+{
+	int nice;
+
+	nice = task_nice(current);
+	lib_ring_buffer_align_ctx(ctx, ltt_alignof(nice));
+	chan->ops->event_write(ctx, &nice, sizeof(nice));
+}
+
+int lttng_add_nice_to_ctx(struct lttng_ctx **ctx)
+{
+	struct lttng_ctx_field *field;
+	int ret;
+
+	field = lttng_append_context(ctx);
+	if (!field)
+		return ret;
+	field->event_field.name = "nice";
+	field->event_field.type.atype = atype_integer;
+	field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT;
+	field->event_field.type.u.basic.integer.alignment = ltt_alignof(int) * CHAR_BIT;
+	field->event_field.type.u.basic.integer.signedness = is_signed_type(int);
+	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 = nice_get_size;
+	field->record = nice_record;
+	wrapper_vmalloc_sync_all();
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lttng_add_nice_to_ctx);
+
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Linux Trace Toolkit Nice Context");