After the RFC discussion, updated patches which I propose for review and merge:
The following patches against qemu.git allow static trace events to be declared
in QEMU. Trace events use a lightweight syntax and are independent of the
backend tracing system (e.g. LTTng UST).
Supported backends are:
* my trivial tracer ("simple")
* LTTng Userspace Tracer ("ust")
* no tracer ("nop", the default)
The ./configure option to choose a backend is --trace-backend=.
Main point of this patchset: adding new trace events is easy and we can switch
between backends without modifying the code.
These patches are also available at:
http://repo.or.cz/w/qemu/stefanha.git/shortlog/refs/heads/tracing
v2:
[PATCH 1/7] trace: Add trace-events file for declaring trace events
* Use "$source_path/tracetool" in ./configure
* Include qemu-common.h in trace.h so common types are available
[PATCH 2/7] trace: Support disabled events in trace-events
* New in v2: makes it easy to build only a subset of trace events
[PATCH 3/7] trace: Add simple built-in tracing backend
* Make simpletrace.py parse trace-events instead of generating Python
[PATCH 4/7] trace: Add LTTng Userspace Tracer backend
[PATCH 5/7] trace: Trace qemu_malloc() and qemu_vmalloc()
* Record pointer result from allocation functions
[PATCH 6/7] trace: Trace virtio-blk, multiwrite, and paio_submit
[PATCH 7/7] trace: Trace virtqueue operations
* New in v2: observe virtqueue buffer add/remove and notifies
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