# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxxxx
# Node ID b217e03e1db5bcde98fb15ca9d5df303ea067bc4
# Parent 7a7066ae2e778036c5db84c5ffe35d8206b6edb6
[BLKBACK] Output statistics to sysfs.
The location is 'statistics' directory under each VBD directory, for
example, /sys/devices/xen-backend/vbd-x-xxxx/statistics.
The 'statistics' directory includes the following three statistical
information:
oo_req
is the number of requests held up due to full pipeline.
rd_req
is the number of processed READ requests.
wr_req
is the number of processed WRITE requests.
Signed-off-by: Satoshi UCHIDA <s-uchida@xxxxxxxxxxxxx>
---
linux-2.6-xen-sparse/drivers/xen/blkback/xenbus.c | 67 +++++++++++++++++++++-
1 files changed, 66 insertions(+), 1 deletion(-)
diff -r 7a7066ae2e77 -r b217e03e1db5
linux-2.6-xen-sparse/drivers/xen/blkback/xenbus.c
--- a/linux-2.6-xen-sparse/drivers/xen/blkback/xenbus.c Wed Jun 28 10:24:05
2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/blkback/xenbus.c Wed Jun 28 10:32:43
2006 +0100
@@ -42,7 +42,6 @@ static int connect_ring(struct backend_i
static int connect_ring(struct backend_info *);
static void backend_changed(struct xenbus_watch *, const char **,
unsigned int);
-
static void update_blkif_status(blkif_t *blkif)
{
@@ -73,6 +72,70 @@ static void update_blkif_status(blkif_t
}
+/****************************************************************
+ * sysfs interface for VBD I/O requests
+ */
+
+#ifdef CONFIG_SYSFS
+
+#define VBD_SHOW(name, format, args...)
\
+ static ssize_t show_##name(struct device *_dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+ { \
+ struct xenbus_device *dev = to_xenbus_device(_dev); \
+ struct backend_info *be = dev->dev.driver_data; \
+ \
+ return sprintf(buf, format, ##args); \
+ } \
+ DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
+
+VBD_SHOW(oo_req, "%d\n", be->blkif->st_oo_req);
+VBD_SHOW(rd_req, "%d\n", be->blkif->st_rd_req);
+VBD_SHOW(wr_req, "%d\n", be->blkif->st_wr_req);
+
+static struct attribute *vbdstat_attrs[] = {
+ &dev_attr_oo_req.attr,
+ &dev_attr_rd_req.attr,
+ &dev_attr_wr_req.attr,
+ NULL
+};
+
+static struct attribute_group vbdstat_group = {
+ .name = "statistics",
+ .attrs = vbdstat_attrs,
+};
+
+int xenvbd_sysfs_addif(struct xenbus_device *dev)
+{
+ int error = 0;
+
+ error = sysfs_create_group(&dev->dev.kobj,
+ &vbdstat_group);
+ if (error)
+ goto fail;
+
+ return 0;
+
+fail:
+ sysfs_remove_group(&dev->dev.kobj,
+ &vbdstat_group);
+ return error;
+}
+
+void xenvbd_sysfs_delif(struct xenbus_device *dev)
+{
+ sysfs_remove_group(&dev->dev.kobj,
+ &vbdstat_group);
+}
+
+#else
+
+#define xenvbd_sysfs_addif(dev) (0)
+#define xenvbd_sysfs_delif(dev) ((void)0)
+
+#endif /* CONFIG_SYSFS */
+
static ssize_t show_physical_device(struct device *_dev,
struct device_attribute *attr, char *buf)
{
@@ -115,6 +178,7 @@ static int blkback_remove(struct xenbus_
device_remove_file(&dev->dev, &dev_attr_physical_device);
device_remove_file(&dev->dev, &dev_attr_mode);
+ xenvbd_sysfs_delif(dev);
kfree(be);
dev->dev.driver_data = NULL;
@@ -237,6 +301,7 @@ static void backend_changed(struct xenbu
device_create_file(&dev->dev, &dev_attr_physical_device);
device_create_file(&dev->dev, &dev_attr_mode);
+ xenvbd_sysfs_addif(dev);
/* We're potentially connected now */
update_blkif_status(be->blkif);
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