On 06/13/2016 10:58 AM, Denis V. Lunev wrote:
> Please note, trace_init_backends() must be called in the final process,
> i.e. after daemonization. This is necessary to keep tracing thread in
> the proper process.
> 
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Eric Blake <eblake@redhat.com>
> CC: Paolo Bonzini <pbonzini@redhat.com>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
> CC: Kevin Wolf <kwolf@redhat.com>
> ---
>  Makefile      |  2 +-
>  qemu-nbd.c    | 18 +++++++++++++++++-
>  qemu-nbd.texi |  2 ++
>  3 files changed, 20 insertions(+), 2 deletions(-)
> 

> +++ b/qemu-nbd.c

> @@ -88,6 +90,8 @@ static void usage(const char *name)
>  "General purpose options:\n"
>  "  --object type,id=ID,...   define an object such as 'secret' for providing\n"
>  "                            passwords and/or encryption keys\n"
> +"  -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
> +"                            specify tracing options\n"

> +++ b/qemu-nbd.texi
> @@ -92,6 +92,8 @@ Display extra debugging information
>  Display this help and exit
>  @item -V, --version
>  Display version information and exit
> +@item -T, --trace [events=@var{file}][,file=@var{file}]

Still not consistent.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org