Some perf_topdown code cleanup (#714)

* topdown: remove unneccessary data structure

* topdown: Remove example CMakeLists comments

Author: daboehme

src/services/perf/CMakeLists.txt

@@ -1,16 +1,2 @@
-# Use the add_service_sources() macro to add sources without external dependencies.
-# For services that do have external dependencies (a third-party library), create
-# an object library instead and use the add_service_objectlib macro instead:
-#
-#   include_directories(${<dependency>_INCLUDE_DIRS})
-#   add_library(caliper-templateservices OBJECT ${CALIPER_SERVICE_TEMPLATE_SOURCES})
-#
-#   add_service_objlib("caliper-templateservices")
 add_service_sources(PerfTopdown.cpp)
-
-# Use the add_caliper_service() macro to add the service(s).
-# The first word in the string must be the name used in the service's 
-# CaliperService variable name and name element. The second (optional) word
-# is a #ifdef condition in caliper-config.h that must be met for the 
-# service.
 add_caliper_service("perf_topdown CALIPER_HAVE_LIBPFM")

src/services/perf/PerfTopdown.cpp

@@ -78,19 +78,6 @@ bool check_compatibility()
 
 class PerfTopdownService
 {
-    struct topdown_record_t {
-        uint64_t num        { 0 };
-        uint64_t slots      { 0 };
-        uint64_t retiring   { 0 };
-        uint64_t bad_spec   { 0 };
-        uint64_t fe_bound   { 0 };
-        uint64_t be_bound   { 0 };
-        uint64_t heavy_ops  { 0 };
-        uint64_t br_mispred { 0 };
-        uint64_t fetch_lat  { 0 };
-        uint64_t mem_bound  { 0 };
-    };
-
     enum Level { Top, All };
 
     struct ThreadInfo {