X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lttng-context-prio.c;h=b5d21e7e9438bafee3779d483532745f1ec1e65b;hb=27e6eda75df97483d07d61ba731bbc428e2161f9;hp=a748929a609c826ced34fb9b8c8a766e8e1b4c15;hpb=a8ad3613f2e0e272487b8ec0f0ec8e3c6da689f9;p=lttng-modules.git

diff --git a/lttng-context-prio.c b/lttng-context-prio.c
index a748929a..b5d21e7e 100644
--- a/lttng-context-prio.c
+++ b/lttng-context-prio.c
@@ -1,26 +1,40 @@
-/*
- * (C) Copyright	2009-2011 -
- * 		Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
+ * lttng-context-prio.c
  *
  * LTTng priority context.
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
 #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"
+#include <lttng-events.h>
+#include <wrapper/ringbuffer/frontend_types.h>
+#include <wrapper/vmalloc.h>
+#include <wrapper/kallsyms.h>
+#include <lttng-tracer.h>
+
+static
+int (*wrapper_task_prio_sym)(struct task_struct *t);
+
+int wrapper_task_prio_init(void)
+{
+	wrapper_task_prio_sym = (void *) kallsyms_lookup_funcptr("task_prio");
+	if (!wrapper_task_prio_sym) {
+		printk(KERN_WARNING "LTTng: task_prio symbol lookup failed.\n");
+		return -EINVAL;
+	}
+	return 0;
+}
 
 static
 size_t prio_get_size(size_t offset)
 {
 	size_t size = 0;
 
-	size += lib_ring_buffer_align(offset, ltt_alignof(int));
+	size += lib_ring_buffer_align(offset, lttng_alignof(int));
 	size += sizeof(int);
 	return size;
 }
@@ -28,13 +42,21 @@ size_t prio_get_size(size_t offset)
 static
 void prio_record(struct lttng_ctx_field *field,
 		struct lib_ring_buffer_ctx *ctx,
-		struct ltt_channel *chan)
+		struct lttng_channel *chan)
 {
 	int prio;
 
-	pid = p->prio - MAX_RT_PRIO;
-	lib_ring_buffer_align_ctx(ctx, ltt_alignof(pid));
-	chan->ops->event_write(ctx, &pid, sizeof(pid));
+	prio = wrapper_task_prio_sym(current);
+	lib_ring_buffer_align_ctx(ctx, lttng_alignof(prio));
+	chan->ops->event_write(ctx, &prio, sizeof(prio));
+}
+
+static
+void prio_get_value(struct lttng_ctx_field *field,
+		struct lttng_probe_ctx *lttng_probe_ctx,
+		union lttng_ctx_value *value)
+{
+	value->s64 = wrapper_task_prio_sym(current);
 }
 
 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx)
@@ -42,24 +64,32 @@ int lttng_add_prio_to_ctx(struct lttng_ctx **ctx)
 	struct lttng_ctx_field *field;
 	int ret;
 
+	if (!wrapper_task_prio_sym) {
+		ret = wrapper_task_prio_init();
+		if (ret)
+			return ret;
+	}
+
 	field = lttng_append_context(ctx);
 	if (!field)
-		return ret;
+		return -ENOMEM;
+	if (lttng_find_context(*ctx, "prio")) {
+		lttng_remove_context_field(ctx, field);
+		return -EEXIST;
+	}
 	field->event_field.name = "prio";
 	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.alignment = lttng_alignof(int) * CHAR_BIT;
+	field->event_field.type.u.basic.integer.signedness = lttng_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 = prio_get_size;
 	field->record = prio_record;
+	field->get_value = prio_get_value;
+	lttng_context_update(*ctx);
 	wrapper_vmalloc_sync_all();
 	return 0;
 }
 EXPORT_SYMBOL_GPL(lttng_add_prio_to_ctx);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support");