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>

1 files changed, 2 insertions, 2 deletions

diff --git a/vl.c b/vl.c
index a3def97443..ac0e3d7e83 100644
--- a/vl.c
+++ b/vl.c
@@ -4039,7 +4039,7 @@ int main(int argc, char **argv, char **envp)
     }
 
     if (!is_daemonized()) {
-        if (!trace_backend_init(trace_events, trace_file)) {
+        if (!trace_init_backends(trace_events, trace_file)) {
             exit(1);
         }
     }
@@ -4559,7 +4559,7 @@ int main(int argc, char **argv, char **envp)
     os_setup_post();
 
     if (is_daemonized()) {
-        if (!trace_backend_init(trace_events, trace_file)) {
+        if (!trace_init_backends(trace_events, trace_file)) {
             exit(1);
         }
     }