On Fri, Aug 23, 2019 at 04:22:03PM +0200, Philippe Mathieu-Daudé wrote: > Most tracing backends are implemented within QEMU, except the > DTrace/SystemTap backends. > > One side effect is when running 'qemu -trace help', an incomplete > list of trace events is displayed when using the DTrace/SystemTap > backends. > > This is partly due to trace events registered as modules with > trace_init(), and since the events are not used within QEMU, > the linker optimize and remove the unused modules (which is > OK in this particular case). > Currently only the events compiled in trace-root.o and in the > last trace.o member of libqemuutil.a are linked, resulting in > an incomplete list of events. > > To avoid confusion, improve the help message, recommending to > use the proper systemtap script to display the events list. > > Before: > > $ lm32-softmmu/qemu-system-lm32 -trace help 2>&1 | wc -l > 70 > > After: > > $ lm32-softmmu/qemu-system-lm32 -trace help > Run 'qemu-trace-stap list qemu-system-lm32' to print a list > of names of trace points with the DTrace/SystemTap backends. > > $ qemu-trace-stap list qemu-system-lm32 | wc -l > 1136 > > Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com> > --- > v2: Consider when multiple trace backends are used (Stefan) > --- > trace/control.c | 6 ++++++ > 1 file changed, 6 insertions(+)
Thanks, applied to my tracing tree: https://github.com/stefanha/qemu/commits/tracing Stefan
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