Contact: Stephen Hemminger <sthemmin@microsoft.com>
Description: Binary file created by uio_hv_generic for ring buffer
Users: Userspace drivers
+
+What: /sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_in_full
+Date: February 2019
+KernelVersion: 5.0
+Contact: Michael Kelley <mikelley@microsoft.com>
+Description: Number of guest to host interrupts caused by the inbound ring
+ buffer transitioning from full to not full while a packet is
+ waiting for buffer space to become available
+Users: Debugging tools
+
+What: /sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_out_empty
+Date: February 2019
+KernelVersion: 5.0
+Contact: Michael Kelley <mikelley@microsoft.com>
+Description: Number of guest to host interrupts caused by the outbound ring
+ buffer transitioning from empty to not empty
+Users: Debugging tools
+
+What: /sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_first
+Date: February 2019
+KernelVersion: 5.0
+Contact: Michael Kelley <mikelley@microsoft.com>
+Description: Number of write operations that were the first to encounter an
+ outbound ring buffer full condition
+Users: Debugging tools
+
+What: /sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_total
+Date: February 2019
+KernelVersion: 5.0
+Contact: Michael Kelley <mikelley@microsoft.com>
+Description: Total number of write operations that encountered an outbound
+ ring buffer full condition
+Users: Debugging tools
* This is the only case we need to signal when the
* ring transitions from being empty to non-empty.
*/
- if (old_write == READ_ONCE(rbi->ring_buffer->read_index))
+ if (old_write == READ_ONCE(rbi->ring_buffer->read_index)) {
+ ++channel->intr_out_empty;
vmbus_setevent(channel);
+ }
}
/* Get the next write location for the specified ring buffer. */
* is empty since the read index == write index.
*/
if (bytes_avail_towrite <= totalbytes_towrite) {
+ ++channel->out_full_total;
+
+ if (!channel->out_full_flag) {
+ ++channel->out_full_first;
+ channel->out_full_flag = true;
+ }
+
spin_unlock_irqrestore(&outring_info->ring_lock, flags);
return -EAGAIN;
}
+ channel->out_full_flag = false;
+
/* Write to the ring buffer */
next_write_location = hv_get_next_write_location(outring_info);
if (curr_write_sz <= pending_sz)
return;
+ ++channel->intr_in_full;
vmbus_setevent(channel);
}
EXPORT_SYMBOL_GPL(hv_pkt_iter_close);
}
static VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL);
+static ssize_t channel_intr_in_full_show(const struct vmbus_channel *channel,
+ char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)channel->intr_in_full);
+}
+static VMBUS_CHAN_ATTR(intr_in_full, 0444, channel_intr_in_full_show, NULL);
+
+static ssize_t channel_intr_out_empty_show(const struct vmbus_channel *channel,
+ char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)channel->intr_out_empty);
+}
+static VMBUS_CHAN_ATTR(intr_out_empty, 0444, channel_intr_out_empty_show, NULL);
+
+static ssize_t channel_out_full_first_show(const struct vmbus_channel *channel,
+ char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)channel->out_full_first);
+}
+static VMBUS_CHAN_ATTR(out_full_first, 0444, channel_out_full_first_show, NULL);
+
+static ssize_t channel_out_full_total_show(const struct vmbus_channel *channel,
+ char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)channel->out_full_total);
+}
+static VMBUS_CHAN_ATTR(out_full_total, 0444, channel_out_full_total_show, NULL);
+
static ssize_t subchannel_monitor_id_show(const struct vmbus_channel *channel,
char *buf)
{
&chan_attr_latency.attr,
&chan_attr_interrupts.attr,
&chan_attr_events.attr,
+ &chan_attr_intr_in_full.attr,
+ &chan_attr_intr_out_empty.attr,
+ &chan_attr_out_full_first.attr,
+ &chan_attr_out_full_total.attr,
&chan_attr_monitor_id.attr,
&chan_attr_subchannel_id.attr,
NULL
u64 interrupts; /* Host to Guest interrupts */
u64 sig_events; /* Guest to Host events */
+ /*
+ * Guest to host interrupts caused by the outbound ring buffer changing
+ * from empty to not empty.
+ */
+ u64 intr_out_empty;
+
+ /*
+ * Indicates that a full outbound ring buffer was encountered. The flag
+ * is set to true when a full outbound ring buffer is encountered and
+ * set to false when a write to the outbound ring buffer is completed.
+ */
+ bool out_full_flag;
+
/* Channel callback's invoked in softirq context */
struct tasklet_struct callback_event;
void (*onchannel_callback)(void *context);
* vmbus_connection.work_queue and hang: see vmbus_process_offer().
*/
struct work_struct add_channel_work;
+
+ /*
+ * Guest to host interrupts caused by the inbound ring buffer changing
+ * from full to not full while a packet is waiting.
+ */
+ u64 intr_in_full;
+
+ /*
+ * The total number of write operations that encountered a full
+ * outbound ring buffer.
+ */
+ u64 out_full_total;
+
+ /*
+ * The number of write operations that were the first to encounter a
+ * full outbound ring buffer.
+ */
+ u64 out_full_first;
};
static inline bool is_hvsock_channel(const struct vmbus_channel *c)
static inline void set_channel_pending_send_size(struct vmbus_channel *c,
u32 size)
{
+ unsigned long flags;
+
+ if (size) {
+ spin_lock_irqsave(&c->outbound.ring_lock, flags);
+ ++c->out_full_total;
+
+ if (!c->out_full_flag) {
+ ++c->out_full_first;
+ c->out_full_flag = true;
+ }
+ spin_unlock_irqrestore(&c->outbound.ring_lock, flags);
+ } else {
+ c->out_full_flag = false;
+ }
+
c->outbound.ring_buffer->pending_send_sz = size;
}