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https://gitlab.com/qemu-project/qemu
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3932ef3ffb
QEMU keeps track of trace event enabled/disabled state and provides monitor commands to inspect and modify the "dstate". SystemTap and LTTng UST maintain independent enabled/disabled states for each trace event, the other backends rely on QEMU dstate. Introduce a new per-event macro that combines backend-specific dstate like this: #define TRACE_MY_EVENT_BACKEND_DSTATE() ( \ QEMU_MY_EVENT_ENABLED() || /* SystemTap */ \ tracepoint_enabled(qemu, my_event) /* LTTng UST */ || \ false) This will be used to extend trace_event_get_state() in the next patch. [Daniel Berrange pointed out that QEMU_MY_EVENT_ENABLED() must be true by default, not false. This way events will fire even if the DTrace implementation does not implement the SystemTap semaphores feature. Ubuntu Precise uses lttng-ust-dev 2.0.2 which does not have tracepoint_enabled(), so we need a compatibility wrapper to keep Travis builds passing. --Stefan] Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20170731140718.22010-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> fixup! trace: add TRACE_<event>_BACKEND_DSTATE() |
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.. | ||
coccinelle | ||
kvm | ||
modules | ||
qemu-guest-agent | ||
qemugdb | ||
qmp | ||
tracetool | ||
analyse-9p-simpletrace.py | ||
analyze-inclusions | ||
analyze-migration.py | ||
check-qerror.sh | ||
checkpatch.pl | ||
clean-header-guards.pl | ||
clean-includes | ||
cleanup-trace-events.pl | ||
cocci-macro-file.h | ||
coverity-model.c | ||
create_config | ||
device-crash-test | ||
disas-objdump.pl | ||
dump-guest-memory.py | ||
extract-vsssdk-headers | ||
feature_to_c.sh | ||
get_maintainer.pl | ||
git.orderfile | ||
gtester-cat | ||
hxtool | ||
make-release | ||
make_device_config.sh | ||
ordereddict.py | ||
qapi-commands.py | ||
qapi-event.py | ||
qapi-introspect.py | ||
qapi-types.py | ||
qapi-visit.py | ||
qapi.py | ||
qapi2texi.py | ||
qemu-binfmt-conf.sh | ||
qemu-gdb.py | ||
qemu.py | ||
qtest.py | ||
refresh-pxe-roms.sh | ||
shaderinclude.pl | ||
show-fixed-bugs.sh | ||
signrom.py | ||
simpletrace.py | ||
switch-timer-api | ||
texi2pod.pl | ||
tracetool.py | ||
update-linux-headers.sh | ||
vmstate-static-checker.py |