trace: update old trace events in docs

Commit c5f1ad429cdf26023cf331075a7d327708e3db6d ("block: Remove
bdrv_aio_readv/writev/flush()") removed
bdrv_aio_readv()/bdrv_aio_writev() so the example in the tracing
documentation is no longer valid.

Reported-by: Wang Dong <dongdwdw@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20170714133111.27359-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/docs/devel/tracing.txt b/docs/devel/tracing.txt
index 8c0029becae6b02898998cbd610814b9bb167823..5768a0b7a2448690e310b07f0e28de1fb38eabbc 100644 (file)
--- a/docs/devel/tracing.txt
+++ b/docs/devel/tracing.txt
@@ -14,8 +14,7 @@ for debugging, profiling, and observing execution.
 
 2. Create a file with the events you want to trace:
 
-   echo bdrv_aio_readv   > /tmp/events
-   echo bdrv_aio_writev >> /tmp/events
+   echo memory_region_ops_read >/tmp/events
 
 3. Run the virtual machine to produce a trace file: