[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2 0/4] trace: add simpletrace-stap format to genera
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v2 0/4] trace: add simpletrace-stap format to generate binary trace |
Date: |
Sun, 22 Jun 2014 21:46:03 +0800 |
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
--
1.9.3
- [Qemu-devel] [PATCH v2 0/4] trace: add simpletrace-stap format to generate binary trace,
Stefan Hajnoczi <=