Am 01.02.2021 um 17:29 hat BALATON Zoltan geschrieben: > On Mon, 1 Feb 2021, 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 <bala...@eik.bme.hu> > > > > Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> > > > > Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com> > > > > Message-id: 20210112165859.225534-2-stefa...@redhat.com > > > > Signed-off-by: Stefan Hajnoczi <stefa...@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. > > How does this option parsing work? Would then multiple patterns separated by > comma as in -trace pattern1,pattern2 also work?
This would be interpreted as an implied "enable" option with a value of "pattern1,pattern2". I don't think anything splits that string at the comma, so it would look for a trace event matching that string. Kevin
