From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 1 Jun 2011 17:55:27 +0000 (-0400)
Subject: Add process priority (as shown in /proc) to context
X-Git-Tag: v2.0-pre1~76
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=a8ad3613f2e0e272487b8ec0f0ec8e3c6da689f9;p=lttng-modules.git

Add process priority (as shown in /proc) to context

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/ltt-debugfs-abi.c b/ltt-debugfs-abi.c
index afdc09a6..aee5bf5d 100644
--- a/ltt-debugfs-abi.c
+++ b/ltt-debugfs-abi.c
@@ -152,6 +152,8 @@ long lttng_abi_add_context(struct file *file,
 	switch (context_param.ctx) {
 	case LTTNG_KERNEL_CONTEXT_PID:
 		return lttng_add_pid_to_ctx(ctx);
+	case LTTNG_KERNEL_CONTEXT_PRIO:
+		return lttng_add_prio_to_ctx(ctx);
 	case LTTNG_KERNEL_CONTEXT_PERF_COUNTER:
 		return -ENOSYS;
 	case LTTNG_KERNEL_CONTEXT_COMM:
diff --git a/ltt-debugfs-abi.h b/ltt-debugfs-abi.h
index 2768055f..586d3a5b 100644
--- a/ltt-debugfs-abi.h
+++ b/ltt-debugfs-abi.h
@@ -65,6 +65,7 @@ enum lttng_kernel_context_type {
 	LTTNG_KERNEL_CONTEXT_PID,
 	LTTNG_KERNEL_CONTEXT_PERF_COUNTER,
 	LTTNG_KERNEL_CONTEXT_COMM,
+	LTTNG_KERNEL_CONTEXT_PRIO,
 };
 
 struct lttng_kernel_perf_counter_ctx {
diff --git a/ltt-events.h b/ltt-events.h
index 2b6ef40a..cb6ee211 100644
--- a/ltt-events.h
+++ b/ltt-events.h
@@ -274,6 +274,7 @@ struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 void lttng_destroy_context(struct lttng_ctx *ctx);
 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 int lttng_add_comm_to_ctx(struct lttng_ctx **ctx);
+int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 
 #ifdef CONFIG_KPROBES
 int lttng_kprobes_register(const char *name,
diff --git a/lttng-context-prio.c b/lttng-context-prio.c
new file mode 100644
index 00000000..a748929a
--- /dev/null
+++ b/lttng-context-prio.c
@@ -0,0 +1,65 @@
+/*
+ * (C) Copyright	2009-2011 -
+ * 		Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * LTTng priority 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 prio_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 prio_record(struct lttng_ctx_field *field,
+		struct lib_ring_buffer_ctx *ctx,
+		struct ltt_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));
+}
+
+int lttng_add_prio_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 = "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.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;
+	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");