commit 5b808275f3bbe8cc95bb9301f4d5a41331d0e0e6
author Lluís Vilanova <vilanova@ac.upc.edu> Tue May 27 15:02:14 2014 +0200
committer Stefan Hajnoczi <stefanha@redhat.com> Mon Jun 09 15:43:40 2014 +0200
tree d5611a010851864336448529088cd94a9afcf83a
parent 82432638ebeedda8a2e18838b6fbef4b14a94f31

trace: Multi-backend tracing

Adds support to compile QEMU with multiple tracing backends at the same time.

For example, you can compile QEMU with:

  $ ./configure --enable-trace-backends=ftrace,dtrace

Where 'ftrace' can be handy for having an in-flight record of events, and 'dtrace' can be later used to extract more information from the system.

This patch allows having both available without recompiling QEMU.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

qemu-io.c

diff --git a/qemu-io.c b/qemu-io.c
index 795cf46..b55a550 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -433,7 +433,7 @@
             }
             break;
         case 'T':
-            if (!trace_backend_init(optarg, NULL)) {
+            if (!trace_init_backends(optarg, NULL)) {
                 exit(1); /* error message will have been printed */
             }
             break;