This enables Lttng Logging for CoreClr,

The Tracepoint Providers are built as a separate shared object called libcoreclrtraceptprovider and it is
available in the same directory as libcoreclr.so

By Default the ability of Tracing will not be present
To enable the ability of  Tracing, the apps need to be run like:

LD_PRELOAD=libcoreclrtraceptprovider.so ./corerun HelloWorld.exe

For now to change Xplat Event Logging mechanism add any events to:
        <root>/src/vm/ClrEtwAll.man
Then regenerate files by running :
        <root>/src/inc/genXplatLtnng.pl

Conflicts:
	Documentation/building/linux-instructions.md

Author: ramarag

CMakeLists.txt

@@ -217,6 +217,10 @@ elseif (CLR_CMAKE_PLATFORM_UNIX)
 
 endif(WIN32)
 
+if (WIN32 OR CLR_CMAKE_PLATFORM_LINUX)
+  add_definitions(-DFEATURE_EVENT_TRACE=1)
+endif (WIN32 OR CLR_CMAKE_PLATFORM_LINUX)
+
 if(CLR_CMAKE_PLATFORM_UNIX)
     add_subdirectory(src/ToolBox/SOS/lldbplugin)
     add_subdirectory(src/pal)
@@ -225,6 +229,7 @@ if(CLR_CMAKE_PLATFORM_UNIX)
     add_subdirectory(src/coreclr/hosts/unixcoreconsole)
 endif(CLR_CMAKE_PLATFORM_UNIX)
 
+
 if(CLR_CMAKE_PLATFORM_DARWIN)
     add_subdirectory(src/coreclr/hosts/osxbundlerun)
 endif(CLR_CMAKE_PLATFORM_DARWIN)
@@ -421,10 +426,7 @@ if (WIN32)
 endif(WIN32)
 # Definition directives
 
-# The following defines were extracted from the official amd64 debug / release builds.
-if (WIN32)
-  add_definitions(-DFEATURE_EVENT_TRACE=1)
-endif (WIN32)
+
 
 if (CLR_CMAKE_PLATFORM_UNIX)
   add_definitions(-DPLATFORM_UNIX=1)

Documentation/building/linux-instructions.md

@@ -26,6 +26,7 @@ Install the following packages for the toolchain:
 - libunwind8-dev
 - gettext
 - libicu-dev
+- liblttng-ust-dev
 
 In order to get lldb-3.6 on Ubuntu 14.04, we need to add an additional package source:
 
@@ -37,7 +38,7 @@ ellismg@linux:~$ sudo apt-get update
 
 Then install the packages you need:
 
-`ellismg@linux:~$ sudo apt-get install cmake llvm-3.5 clang-3.5 lldb-3.6 lldb-3.6-dev libunwind8 libunwind8-dev gettext libicu-dev`
+`ellismg@linux:~$ sudo apt-get install cmake llvm-3.5 clang-3.5 lldb-3.6 lldb-3.6-dev libunwind8 libunwind8-dev gettext libicu-dev liblttng-ust-dev`
 
 You now have all the required components.
 

src/dlls/mscoree/coreclr/CMakeLists.txt

@@ -114,7 +114,14 @@ else()
     )
 endif(WIN32)
 
-target_link_libraries(coreclr ${CORECLR_LIBRARIES})
+if(CLR_CMAKE_PLATFORM_LINUX)
+    list(APPEND CORECLR_LIBRARIES
+        eventprovider
+  )
+  
+endif(CLR_CMAKE_PLATFORM_LINUX)
+
+target_link_libraries(coreclr ${CORECLR_LIBRARIES}) 
 
 if(WIN32)
     add_dependencies(coreclr dactablegen)

src/gc/gc.cpp

@@ -31551,7 +31551,7 @@ void gc_heap::descr_generations_to_profiler (gen_walk_fn fn, void *context)
                 assert (seg == hp->ephemeral_heap_segment);
                 assert (curr_gen_number0 <= max_generation);
                 //
-                if ((curr_gen_number0 == max_generation))
+                if (curr_gen_number0 == max_generation)
                 {
                     if (heap_segment_mem (seg) < generation_allocation_start (hp->generation_of (max_generation-1)))
                     {

src/gc/gcee.cpp

@@ -390,9 +390,10 @@ size_t GCHeap::GetNow()
     return hp->get_time_now();
 }
 
+#if defined(GC_PROFILING) //UNIXTODO: Enable this for FEATURE_EVENT_TRACE
 void ProfScanRootsHelper(Object** ppObject, ScanContext *pSC, DWORD dwFlags)
 {
-#if defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
+#if  defined(FEATURE_EVENT_TRACE)
     Object *pObj = *ppObject;
 #ifdef INTERIOR_POINTERS
     if (dwFlags & GC_CALL_INTERIOR)
@@ -408,10 +409,9 @@ void ProfScanRootsHelper(Object** ppObject, ScanContext *pSC, DWORD dwFlags)
     }
 #endif //INTERIOR_POINTERS
     ScanRootsHelper(&pObj, pSC, dwFlags);
-#endif // defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
+#endif //  defined(FEATURE_EVENT_TRACE)
 }
 
-#if defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
 // This is called only if we've determined that either:
 //     a) The Profiling API wants to do a walk of the heap, and it has pinned the
 //     profiler in place (so it cannot be detached), and it's thus safe to call into the
@@ -454,7 +454,6 @@ void GCProfileWalkHeapWorker(BOOL fProfilerPinned, BOOL fShouldWalkHeapRootsForE
             pGenGCHeap->finalize_queue->GcScanRoots(&ScanRootsHelper, 0, &SC);
 
 #endif // MULTIPLE_HEAPS
-
             // Handles are kept independent of wks/svr/concurrent builds
             SC.dwEtwRootKind = kEtwGCRootKindHandle;
             CNameSpace::GcScanHandlesForProfilerAndETW(max_generation, &SC);
@@ -482,12 +481,10 @@ void GCProfileWalkHeapWorker(BOOL fProfilerPinned, BOOL fShouldWalkHeapRootsForE
             // indicate that dependent handle scanning is over, so we can flush the buffered roots
             // to the profiler.  (This is for profapi only.  ETW will flush after the
             // entire heap was is complete, via ETW::GCLog::EndHeapDump.)
-#if defined (GC_PROFILING)
             if (fProfilerPinned && CORProfilerTrackConditionalWeakTableElements())
             {
                 g_profControlBlock.pProfInterface->EndConditionalWeakTableElementReferences(&SC.pHeapId);
             }
-#endif // defined (GC_PROFILING)
         }
 
         ProfilerWalkHeapContext profilerWalkHeapContext(fProfilerPinned, SC.pvEtwContext);
@@ -517,7 +514,7 @@ void GCProfileWalkHeapWorker(BOOL fProfilerPinned, BOOL fShouldWalkHeapRootsForE
         }
     }
 }
-#endif // defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
+#endif // defined(GC_PROFILING)
 
 void GCProfileWalkHeap()
 {
@@ -543,7 +540,7 @@ void GCProfileWalkHeap()
     }
 #endif // defined (GC_PROFILING)
 
-#ifdef FEATURE_EVENT_TRACE
+#if  defined (GC_PROFILING)//UNIXTODO: Enable this for FEATURE_EVENT_TRACE
     // If the profiling API didn't want us to walk the heap but ETW does, then do the
     // walk here
     if (!fWalkedHeapForProfiler &&