Immediately enable events matching @var{pattern}.
The file must contain one event name (as listed in the @file{trace-events-all}
file) per line; globbing patterns are accepted too. This option is only
-available if QEMU has been compiled with the @var{simple}, @var{stderr}
+available if QEMU has been compiled with the @var{simple}, @var{log}
or @var{ftrace} tracing backend. To specify multiple events or patterns,
specify the @option{-trace} option multiple times.
Immediately enable events listed in @var{file}.
The file must contain one event name (as listed in the @file{trace-events-all}
file) per line; globbing patterns are accepted too. This option is only
-available if QEMU has been compiled with the @var{simple}, @var{stderr} or
+available if QEMU has been compiled with the @var{simple}, @var{log} or
@var{ftrace} tracing backend.
@item file=@var{file}