remove ceph code

[stor4nfv.git] / src / ceph / src / tracing / README.md

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-Installation
-============
-
-The LTTng libraries that ship with Ubuntu 12.04 have been very buggy, and the
-generated header files using `lttng-gen-tp` have needed to be fixed just to
-compile in the Ceph tree. The packages available in Ubuntu 14.04 seem to work
-alright, and for older versions please install LTTng from the LTTng PPA.
-
-    https://launchpad.net/~lttng/+archive/ppa
-
-Then install as normal
-
-    apt-get install lttng-tools liblttng-ust-dev
-
-Add/Update Provider
-===================
-
-## Create tracepoint definition file
-
-Add tracepoint definitions for the provider into a `.tp` file. Documentation
-on defining a tracepoint can be found in `man lttng-ust`. By convention files
-are named according to the logical sub-system they correspond to (e.g.
-`mutex.tp`, `pg.tp`). And add a C source file to be compiled into the tracepoint
-provider shared object, in which `TRACEPOINT_DEFINE` should be defined. See
-[LTTng document](http://lttng.org/docs/#doc-dynamic-linking) for details.
-Place the `.tp` and the `.c` files into the `src/tracing` directory
-and modify the CMake file `src/tracing/CMakeLists.txt` accordingly.
-
-Function Instrumentation
-========================
-Ceph supports instrumentation using GCC's `-finstrument-functions` flag.
-Supported CMake flags are:
-
-*   `-DWITH_OSD_INSTRUMENT_FUNCTIONS=ON`: instrument OSD code
-
-Note that this instrumentation adds an extra function call on each function entry
-and exit of Ceph code. This option is currently only supported with GCC. Using it
-with Clang has no effect.
-
-The only function tracing implementation at the moment is done using LTTng UST.
-In order to use it, Ceph needs to be configured with LTTng using `-DWITH_LTTNG=ON`.
-[TraceCompass](http://www.tracecompass.org) can be used to generate flame
-charts/graphs and other metrics.
-
-It is also possible to use [libbabeltrace](http://diamon.org/babeltrace/#docs)
-to write custom analysis. The entry and exit tracepoints are called
-`lttng_ust_cyg_profile:func_enter` and `lttng_ust_cyg_profile:func_exit`
-respectively. The payload variable `addr` holds the address of the function
-called and the payload variable `call_site` holds the address where it is called.
-`nm` can be used to resolve function addresses (`addr` to function name).
-