mbox series

[v2,0/3] trace: Add a trace backend for the recorder library

Message ID 20200626162706.3304357-1-dinechin@redhat.com
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Series trace: Add a trace backend for the recorder library | expand

Message

Christophe de Dinechin June 26, 2020, 4:27 p.m. UTC 
The recorder library implements low-cost always-on tracing, with three
usage models:

1. Flight recorder: Dump information on recent events in case of crash
2. Tracing: Individual traces can be enabled using environment variables
3. Real-time graphing / control, using the recorder_scope application

This short series introduces a new "recorder" back-end which connects
to the recorder. Traces using the recorder are intentionally "always on".
An example is given of how the recorder can also be used separately
from generated traces. This can be useful if you want to enable
multiple related traces for a particular topic.

This series requires a small makefile fix submitted earlier, included
here for convenience.

Christophe de Dinechin (3):
  Makefile: Compute libraries for libqemuutil.a and libvhost-user.a
  trace: Add support for recorder back-end
  trace: Example of "centralized" recorder tracing

 Makefile                              |  2 ++
 configure                             |  5 +++
 hmp-commands.hx                       | 19 ++++++++--
 monitor/misc.c                        | 27 ++++++++++++++
 scripts/tracetool/backend/recorder.py | 51 +++++++++++++++++++++++++++
 trace/Makefile.objs                   |  2 ++
 trace/control.c                       |  7 ++++
 trace/recorder.c                      | 22 ++++++++++++
 trace/recorder.h                      | 34 ++++++++++++++++++
 util/module.c                         |  8 +++++
 util/qemu-thread-common.h             |  7 ++++
 11 files changed, 182 insertions(+), 2 deletions(-)
 create mode 100644 scripts/tracetool/backend/recorder.py
 create mode 100644 trace/recorder.c
 create mode 100644 trace/recorder.h

-- 
2.26.2