commit bbf0a440813816410eeee465b71b37100b2ec9ca
author Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Tue Oct 05 14:28:53 2010 +0100
committer Blue Swirl <blauwirbel@gmail.com> Sat Oct 09 08:17:03 2010 +0000
tree 2db13712657dfd63425e86f14f5e2924a9fce2bb
parent ea9c16989b0c814d5dd2a09a576018a6aa320a27

trace: Trace bdrv_aio_{readv,writev}

Observing block layer aio readv/writev operations is useful for
debugging image formats or understanding guest disk I/O patterns.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

block.c

diff --git a/block.c b/block.c
index ebbc376..a19374d 100644
--- a/block.c
+++ b/block.c
@@ -1983,6 +1983,8 @@
     BlockDriver *drv = bs->drv;
     BlockDriverAIOCB *ret;
 
+    trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
+
     if (!drv)
         return NULL;
     if (bdrv_check_request(bs, sector_num, nb_sectors))
@@ -2007,6 +2009,8 @@
     BlockDriver *drv = bs->drv;
     BlockDriverAIOCB *ret;
 
+    trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
+
     if (!drv)
         return NULL;
     if (bs->read_only)