# HG changeset patch
# Parent 9c6a7fdebc7fcb76421a8f053be7f5dfcf30c741

diff -r 9c6a7fdebc7f drivers/xen/blkback/blkback.c
--- a/drivers/xen/blkback/blkback.c	Fri May 27 15:32:58 2011 -0700
+++ b/drivers/xen/blkback/blkback.c	Fri May 27 15:33:39 2011 -0700
@@ -543,6 +543,8 @@
 	if (blkif->xenblkd)
 		wake_up_process(blkif->xenblkd);
 
+	blkif->st_req_event++;
+
 	return IRQ_HANDLED;
 }
 
@@ -641,6 +643,8 @@
 			break;
 
 		RING_FINAL_CHECK_FOR_REQUESTS(&blk_rings->common, more_to_do);
+		if (more_to_do)
+			blkif->st_req_again++;
 	} while (more_to_do);
 
 	return more_to_do;
@@ -862,8 +866,10 @@
 	blk_rings->common.rsp_prod_pvt++;
 	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blk_rings->common, notify);
 	spin_unlock_irqrestore(&blkif->blk_ring_lock, flags);
-	if (notify)
+	if (notify) {
 		notify_remote_via_irq(blkif->irq);
+		blkif->st_rsp_event++;
+	}
 }
 
 static int __init blkif_init(void)
diff -r 9c6a7fdebc7f drivers/xen/blkback/common.h
--- a/drivers/xen/blkback/common.h	Fri May 27 15:32:58 2011 -0700
+++ b/drivers/xen/blkback/common.h	Fri May 27 15:33:39 2011 -0700
@@ -117,6 +117,10 @@
 	s64                 st_wr_sum_usecs;
 	s64                 st_wr_max_usecs;
 
+	u64                 st_req_event;
+	u64		    st_req_again;
+	u64                 st_rsp_event;
+
 	unsigned int   nr_shared_pages;
 	grant_handle_t shmem_handle[BLKIF_MAX_RING_PAGES];
 } blkif_t;
diff -r 9c6a7fdebc7f drivers/xen/blkback/xenbus.c
--- a/drivers/xen/blkback/xenbus.c	Fri May 27 15:32:58 2011 -0700
+++ b/drivers/xen/blkback/xenbus.c	Fri May 27 15:33:39 2011 -0700
@@ -337,6 +337,9 @@
 VBD_SHOW(br_req,  "%d\n", be->blkif->st_br_req);
 VBD_SHOW(rd_sect, "%d\n", be->blkif->st_rd_sect);
 VBD_SHOW(wr_sect, "%d\n", be->blkif->st_wr_sect);
+VBD_SHOW(req_event, "%llu\n", be->blkif->st_req_event);
+VBD_SHOW(rsp_event, "%llu\n", be->blkif->st_rsp_event);
+VBD_SHOW(req_again, "%llu\n", be->blkif->st_req_again);
 VBD_SHOW_AVG(rd_usecs, be->blkif->st_rd_cnt,
 	     be->blkif->st_rd_sum_usecs, be->blkif->st_rd_max_usecs);
 VBD_SHOW_AVG(wr_usecs, be->blkif->st_wr_cnt,
@@ -351,6 +354,9 @@
 	&dev_attr_wr_sect.attr,
 	&dev_attr_rd_usecs.attr,
 	&dev_attr_wr_usecs.attr,
+	&dev_attr_req_event.attr,
+	&dev_attr_rsp_event.attr,
+	&dev_attr_req_again.attr,
 	NULL
 };