[RFC patch 32/41] LTTng filter

Mathieu Desnoyers
2009-03-05T23:27:46Z

[-- Attachment #1: lttng-filter.patch --]
[-- Type: text/plain, Size: 4128 bytes --]

Filter module providing the filter/ directory entry.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
include/linux/ltt-tracer.h | 2 +
ltt/Kconfig | 3 ++
ltt/Makefile | 1
ltt/ltt-filter.c | 66 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 72 insertions(+)

Index: linux-2.6-lttng/ltt/Makefile
===================================================================
--- linux-2.6-lttng.orig/ltt/Makefile 2009-03-05 16:09:53.000000000 -0500
+++ linux-2.6-lttng/ltt/Makefile 2009-03-05 16:10:10.000000000 -0500
@@ -13,3 +13,4 @@ obj-$(CONFIG_LTT_STATEDUMP) += ltt-stat
obj-$(CONFIG_LTT_FAST_SERIALIZE) += ltt-type-serializer.o
obj-$(CONFIG_LTT_TRACE_CONTROL) += ltt-trace-control.o
obj-$(CONFIG_LTT_USERSPACE_EVENT) += ltt-userspace-event.o
+obj-$(CONFIG_LTT_FILTER) += ltt-filter.o
Index: linux-2.6-lttng/ltt/ltt-filter.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6-lttng/ltt/ltt-filter.c 2009-03-05 16:09:59.000000000 -0500
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2008 Mathieu Desnoyers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/ltt-tracer.h>
+#include <linux/mutex.h>
+
+#define LTT_FILTER_DIR "filter"
+
+/*
+ * Protects the ltt_filter_dir allocation.
+ */
+static DEFINE_MUTEX(ltt_filter_mutex);
+
+static struct dentry *ltt_filter_dir;
+
+struct dentry *get_filter_root(void)
+{
+ struct dentry *ltt_root_dentry;
+
+ mutex_lock(&ltt_filter_mutex);
+ if (!ltt_filter_dir) {
+ ltt_root_dentry = get_ltt_root();
+ if (!ltt_root_dentry)
+ goto err_no_root;
+
+ ltt_filter_dir = debugfs_create_dir(LTT_FILTER_DIR,
+ ltt_root_dentry);
+ if (!ltt_filter_dir)
+ printk(KERN_ERR
+ "ltt_filter_init: failed to create dir %s\n",
+ LTT_FILTER_DIR);
+ }
+err_no_root:
+ mutex_unlock(&ltt_filter_mutex);
+ return ltt_filter_dir;
+}
+EXPORT_SYMBOL_GPL(get_filter_root);
+
+static void __exit ltt_filter_exit(void)
+{
+ debugfs_remove(ltt_filter_dir);
+}
+
+module_exit(ltt_filter_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>");
+MODULE_DESCRIPTION("Linux Trace Toolkit Filter");
Index: linux-2.6-lttng/include/linux/ltt-tracer.h
===================================================================
--- linux-2.6-lttng.orig/include/linux/ltt-tracer.h 2009-03-05 16:08:41.000000000 -0500
+++ linux-2.6-lttng/include/linux/ltt-tracer.h 2009-03-05 16:09:59.000000000 -0500
@@ -648,6 +648,8 @@ enum ltt_filter_control_msg {
extern int ltt_filter_control(enum ltt_filter_control_msg msg,
const char *trace_name);

+extern struct dentry *get_filter_root(void);
+
void ltt_write_trace_header(struct ltt_trace_struct *trace,
struct ltt_subbuffer_header *header);
extern void ltt_buffer_destroy(struct ltt_channel_struct *ltt_chan);
Index: linux-2.6-lttng/ltt/Kconfig
===================================================================
--- linux-2.6-lttng.orig/ltt/Kconfig 2009-03-05 16:09:41.000000000 -0500
+++ linux-2.6-lttng/ltt/Kconfig 2009-03-05 16:09:59.000000000 -0500
@@ -28,6 +28,9 @@ menuconfig LTT

if LTT

+config LTT_FILTER
+ tristate
+
config LTT_RELAY_ALLOC
def_bool n