Re: [PULL 10/11] trace: document how to specify multiple --trace patterns

[Philippe Mathieu-Daudé]

On 2/1/21 5:13 PM, Kevin Wolf wrote:
> Am 01.02.2021 um 17:05 hat BALATON Zoltan geschrieben:
>> On Mon, 1 Feb 2021, Stefan Hajnoczi wrote:
>>> It is possible to repeat the --trace option to specify multiple
>>> patterns. This may be preferrable to users who do not want to create a
>>> file with a list of patterns.
>>>
>>> Suggested-by: BALATON Zoltan <balaton@eik.bme.hu>
>>> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
>>> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>>> Message-id: 20210112165859.225534-2-stefanha@redhat.com
>>> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
>>> ---
>>> docs/devel/tracing.rst | 9 +++++++--
>>> 1 file changed, 7 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/docs/devel/tracing.rst b/docs/devel/tracing.rst
>>> index af395e957d..e8f9b82c5e 100644
>>> --- a/docs/devel/tracing.rst
>>> +++ b/docs/devel/tracing.rst
>>> @@ -22,10 +22,15 @@ events::
>>> This output comes from the "log" trace backend that is enabled by default 
>>> when
>>> ``./configure --enable-trace-backends=BACKENDS`` was not explicitly 
>>> specified.
>>>
>>> -More than one trace event pattern can be specified by providing a file
>>> -instead::
>>> +Multiple patterns can be specified by repeating the ``--trace`` option::
>>> +
>>> +    $ qemu --trace "kvm_*" --trace "virtio_*" ...
>>
>> Does that actually work? I've always used -trace enable="pattern1" -trace
>> enable="pattern2" Not sure if omitting enable= is the same.
> 
> qemu_trace_opts has .implied_opt_name = "enable", so without having
> tested it, I assume this works.

I use -trace \*pci\* -trace memory\*, and Kevin said -trace and --trace
are the same.