On Sun, Jun 22, 2014 at 09:46:03PM +0800, Stefan Hajnoczi wrote: > v2: > * I realized that v1 was not complete enough after feedback from Lluís and > Frank Ch. Eigler, so here is a v2 after all. > * Add Makefile target for simpletrace .stp file [Lluís] > * Generate SystemTap probe aliases so users can select a subset of probes to > enable [Frank Ch. Eigler] > * Delete --no-header from sys.argv[] so further command-line parsing works > > SystemTap is a popular tracing solution on Fedora and RHEL. It does not have > its own trace file format, instead stap scripts have the freedom to output > data > in whatever format is most appropriate. > > QEMU supports the simpletrace binary format for built-in tracing that comes > with QEMU. Since we need a format for persisting SystemTap traces and a > binary > format has performance advantages, let's output simpletrace-compatible data. > > This patch adds a new stap file that is autogenerated from trace-events. The > following example shows how to use SystemTap and analyze the resulting trace > file with simpletrace.py: > > $ ./configure --enable-trace-backend=dtrace ... && make > $ sudo stap x86_64-softmmu/qemu-system-x86_64-simpletrace.stp >trace > ...run QEMU in another shell... > ^C > $ scripts/simpletrace.py --no-header trace-events trace > > One new concept here is the simpletrace.py --no-header option. SystemTap > supports flight-recorder mode where trace records are written into a ring > buffer. The ring buffer can be dumped at any time so it is useful to skip the > simpletrace header check. > > Stefan Hajnoczi (4): > trace: extract stap_escape() function for reuse > trace: add tracetool simpletrace_stap format > simpletrace: add simpletrace.py --no-header option > trace: install simpletrace SystemTap tapset > > Makefile.target | 10 +++- > scripts/simpletrace.py | 24 +++++++--- > scripts/tracetool/format/simpletrace_stap.py | 71 > ++++++++++++++++++++++++++++ > scripts/tracetool/format/stap.py | 11 +++-- > 4 files changed, 105 insertions(+), 11 deletions(-) > create mode 100644 scripts/tracetool/format/simpletrace_stap.py
Applied to my tracing-next tree: https://github.com/stefanha/qemu/commits/tracing-next Stefan
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