[Qemu-devel] [RFC][PATCH RFC 0/4] trace-instrument: Let the user wrap/override specific event tracing routines

[Lluís Vilanova]

XXX: Must be applied on top of the "backdoor" patch series and the patch "trace:
     Provide a per-event status define for conditional compilation", but is
     independent otherwise.

Adds the "instrument" event property. When specified, this event property lets
the user provide her own implementation for that specific tracing event.

Still, in case the user only wants to wrap around the tracing event, the
original tracing implementation is accessible through function
'trace_<eventname>_backend', instead of the original 'trace_<eventname>' (which
now the user has to provide).

The user-provided tracing functions are expected to be in the static library
"libtrace-instrument.a", identified by the "--with-trace-instrument"
configuration parameter and compiled by each of QEMU's target/frontend pairs.

See the documentation added in the second patch for more information.

Signed-off-by: Lluís Vilanova <address@hidden>
---

Lluís Vilanova (4):
      trace: [tracetool] Add 'get_api_name' to construct the name of tracing 
routines
      trace-instrument: Add documentation
      trace-instrument: Add support for user-provided code on a per-event basis
      trace-instrument: Add a per-vCPU opaque pointer for the instrumentation 
backend


 Makefile.objs            |   23 +++++++
 Makefile.target          |    2 -
 configure                |   38 ++++++++++++
 cpu-defs.h               |    6 +-
 docs/instrumentation.txt |  142 ++++++++++++++++++++++++++++++++++++++++++++++
 docs/tracing.txt         |    9 +++
 scripts/simpletrace.py   |    2 -
 scripts/tracetool        |   57 +++++++++++++++---
 8 files changed, 261 insertions(+), 18 deletions(-)
 create mode 100644 docs/instrumentation.txt