Squashed commit of the following:

commit 45d11dde6acdc3def0a13302c527e3c7a662b009
Author: David Mason <davmason@microsoft.com>
Date:   Wed May 25 19:00:10 2016 -0700

    Squashed commit of the following:

    commit f586c5552d8225f13b5a0476f5bdf9362ba9ee8d
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Wed May 25 14:17:45 2016 -0700

        Fix heap dump GC type to be Induced

        Previously we didn't set the GC type to be "Induced" when collecting a heap dump.  This would cause perfview to ignore the GC.

    commit 78866dfdcc15ebade0a2faeb6af9a5b7f5e0a170
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Wed May 25 13:18:41 2016 -0700

        Enable LTTng events for creating a gcdump

        There were a handful of events that were not properly enabled on linux.  This change adds enables the remaining events to allow heap dumps.

    commit 04d3d6c3d9a1c87e88bc1db91f717481f21874bc
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Tue May 24 12:57:16 2016 -0700

        Fix BulkTypeEvents

        The buffer used for BulkTypeEvents was defined as a BYTE** instead of BYTE*.  This lead to incorrectly written BulkTypeEvents.

    commit 8ceab5828e8101b134beb0175b1842487607636c
    Author: David Mason <davmason@microsoft.com>
    Date:   Wed May 18 11:21:12 2016 -0700

        Add logic for finalizer thread to check to see if a heap dump is required.

    commit cd64b4884d639ce90e4192975533f5e873bd1cb3
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Thu May 19 14:24:01 2016 -0700

        Special case BulkType LTTng event

        The BulkType LTTng event does not have a real element size.  Instead each element is variable length.  This change updates the FireBulkType method to allow us to pass the correct size to LTTng.

    commit f8ab762106188bc124af802ec0490ef8375412b5
    Merge: 77495aa f0d9ab4
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Thu May 19 13:49:43 2016 -0700

        Merge branch 'gc-events' of github.com:leculver/coreclr into gc-events

    commit f0d9ab4e52c69b45d2d169983c23ab5263edb5c0
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Thu May 19 12:51:01 2016 -0700

        Enable BulkType LTTng events on linux

        Emit calls to FireBulkType events on linux.  This commit enables the code, but currently the wrong size is used in the etw subsystem (this function must be special cased).

    commit 25c682ce49f51298f011046faa50443c569943b7
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Wed May 18 12:06:05 2016 -0700

        Fix multiple LTTng issues

        - Only emit LTTng events when LTTng is enabled.  We now use the tracepoint_enabled macro to check if an event is enabled...when the version of lttng is installed that supports it.
        - Unsplit LTTng events.  Previously we split LTTng events when they exceeded the field limit of LTTng.  Now we emit those events as a raw byte array so that it matches their windows ETW counterparts byte-for-byte.
        - Emit any event with a struct or embedded array as a raw byte array too.  The structure of memory that LTTng emits is incompatible with our ETW parsing.  Changing events with struct/array fields greatly simplifies the parsing of events.

    commit 77495aa1b3415dcee8d4b6e8eb1d0b5cb921f821
    Merge: 754596d f77577c
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Tue May 17 18:24:55 2016 -0700

        Merge branch 'master' of github.com:leculver/coreclr

    commit 754596d9c51d07db9267148a20f81c786f719312
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Tue May 17 18:21:54 2016 -0700

        Squashed commit of the following:

        commit f77577c1d7c552de9e75f6fb98a656a1d09bf8b2
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Tue May 17 18:04:18 2016 -0700

            Properly handle arrays in LTTng

            Arrays were not being properly handled by the LTTng code generator.

        commit 390e998719e050a4e61b29bef4c8f8ecbff3423f
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Tue May 17 11:21:07 2016 -0700

            Manually write events with structs

            Manually write events to LTTng which have structs embedded in them.

        commit 54ae7c79f3c96987504cece302513ac9215afbfe
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Tue May 17 09:12:45 2016 -0700

            Fix issue with struct sizes

            Struct sizes were not properly calculated for manually saved events.

        commit d4e59b1b8b18822e551e585ebe006e5b66066bf8
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Mon May 16 20:57:33 2016 -0700

            Fix tests

            Tests were not being generated properly, as they skipped a parameter.
            This is now fixed.

        commit 91d68c7ee36f28b1d9de8d0242edcd078416dc80
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Wed May 11 17:41:23 2016 -0700

            Remove excess fields in LTTng stream

            Extra fields were inserted into LTTng to calculate the size of struct
            pointers.  Now this calculation is done natively without needing to
            insert the extra fields.

        commit 3bf826f5e36637ff5188d0205510d7236458075a
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Tue May 10 10:00:39 2016 -0700

            Re-enable dynamic linking to fix a load issue

            Was getting a loader issue on startup, disabling static linking for now.

        commit aacb45ff675d2299df938493416f875096ec446c
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Thu Apr 28 20:56:01 2016 -0700

            Unsplit lttng events

            LTTng has a limitation in that it cannot emit events with more than 9
            parameters.  Previously we would split these events into multiple
            events.  However this proves to be very difficult to consume with
            TraceEvent.  Instead we now pack the parameters into a byte array an
            emit the byte array + length as a single event, avoiding the need to
            recombine events later.

        commit a9a630da28d42132c2e8929909e86545fbe630c9
        Author: Lee Culver <leculver@microsoft.com>
        Date:   Wed Apr 20 13:31:33 2016 -0700

            Only emit LTTng events when they are enabeld.

            This changes adds a check for tracepoint_enabled (when that feature is available).
            This change also statically compiles against the LTTng libraries (instead of dynamically) to avoid using entrypoints that may not be there if compiled against a different lttng that lacks the tracepoint_enabled entrypoint.

    commit f77577c1d7c552de9e75f6fb98a656a1d09bf8b2
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Tue May 17 18:04:18 2016 -0700

        Properly handle arrays in LTTng

        Arrays were not being properly handled by the LTTng code generator.

    commit 390e998719e050a4e61b29bef4c8f8ecbff3423f
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Tue May 17 11:21:07 2016 -0700

        Manually write events with structs

        Manually write events to LTTng which have structs embedded in them.

    commit 54ae7c79f3c96987504cece302513ac9215afbfe
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Tue May 17 09:12:45 2016 -0700

        Fix issue with struct sizes

        Struct sizes were not properly calculated for manually saved events.

    commit d4e59b1b8b18822e551e585ebe006e5b66066bf8
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Mon May 16 20:57:33 2016 -0700

        Fix tests

        Tests were not being generated properly, as they skipped a parameter.
        This is now fixed.

    commit 91d68c7ee36f28b1d9de8d0242edcd078416dc80
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Wed May 11 17:41:23 2016 -0700

        Remove excess fields in LTTng stream

        Extra fields were inserted into LTTng to calculate the size of struct
        pointers.  Now this calculation is done natively without needing to
        insert the extra fields.

    commit 3bf826f5e36637ff5188d0205510d7236458075a
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Tue May 10 10:00:39 2016 -0700

        Re-enable dynamic linking to fix a load issue

        Was getting a loader issue on startup, disabling static linking for now.

    commit aacb45ff675d2299df938493416f875096ec446c
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Thu Apr 28 20:56:01 2016 -0700

        Unsplit lttng events

        LTTng has a limitation in that it cannot emit events with more than 9
        parameters.  Previously we would split these events into multiple
        events.  However this proves to be very difficult to consume with
        TraceEvent.  Instead we now pack the parameters into a byte array an
        emit the byte array + length as a single event, avoiding the need to
        recombine events later.

    commit a9a630da28d42132c2e8929909e86545fbe630c9
    Author: Lee Culver <leculver@microsoft.com>
    Date:   Wed Apr 20 13:31:33 2016 -0700

        Only emit LTTng events when they are enabeld.

        This changes adds a check for tracepoint_enabled (when that feature is available).
        This change also statically compiles against the LTTng libraries (instead of dynamically) to avoid using entrypoints that may not be there if compiled against a different lttng that lacks the tracepoint_enabled entrypoint.

1 files changed, 49 insertions, 1 deletions

diff --git a/src/vm/finalizerthread.cpp b/src/vm/finalizerthread.cpp
index 727b57319b..5fe0b486cc 100644
--- a/src/vm/finalizerthread.cpp
+++ b/src/vm/finalizerthread.cpp
@@ -22,6 +22,16 @@
 
 BOOL FinalizerThread::fRunFinalizersOnUnload = FALSE;
 BOOL FinalizerThread::fQuitFinalizer = FALSE;
+
+#if defined(__linux__)
+#define LINUX_HEAP_DUMP_TIME_OUT 10000
+
+extern bool s_forcedGCInProgress;
+ULONGLONG FinalizerThread::LastHeapDumpTime = 0;
+
+Volatile<BOOL> g_TriggerHeapDump = FALSE;
+#endif // __linux__
+
 AppDomain * FinalizerThread::UnloadingAppDomain;
 
 CLREvent * FinalizerThread::hEventFinalizer = NULL;
@@ -509,7 +519,11 @@ void FinalizerThread::WaitForFinalizerEvent (CLREvent *event)
                 cEventsForWait,                           // # objects to wait on
                 &(MHandles[uiEventIndexOffsetForWait]),   // array of objects to wait on
                 FALSE,          // bWaitAll == FALSE, so wait for first signal
+#if defined(__linux__)
+                LINUX_HEAP_DUMP_TIME_OUT,
+#else
                 INFINITE,       // timeout
+#endif
                 FALSE)          // alertable
                 
                 // Adjust the returned array index for the offset we used, so the return
@@ -539,7 +553,17 @@ void FinalizerThread::WaitForFinalizerEvent (CLREvent *event)
                 // Spawn thread to perform the profiler attach, then resume our wait
                 ProfilingAPIAttachDetach::ProcessSignaledAttachEvent();
                 break;
-#endif // FEATURE_PROFAPI_ATTACH_DETACH 
+#endif // FEATURE_PROFAPI_ATTACH_DETACH
+#if defined(__linux__)
+            case (WAIT_TIMEOUT + kLowMemoryNotification):
+            case (WAIT_TIMEOUT + kFinalizer):
+                if (g_TriggerHeapDump)
+                {
+                    return;
+                }
+                
+                break;
+#endif
             default:
                 //what's wrong?
                 _ASSERTE (!"Bad return code from WaitForMultipleObjects");
@@ -550,7 +574,11 @@ void FinalizerThread::WaitForFinalizerEvent (CLREvent *event)
     else {
         static LONG sLastLowMemoryFromHost = 0;
         while (1) {
+#if defined(__linux__)
+            DWORD timeout = LINUX_HEAP_DUMP_TIME_OUT;
+#else
             DWORD timeout = INFINITE;
+#endif
             if (!CLRMemoryHosted())
             {
                 if (WaitForSingleObject(MHandles[kLowMemoryNotification], 0) == WAIT_OBJECT_0) {
@@ -585,6 +613,12 @@ void FinalizerThread::WaitForFinalizerEvent (CLREvent *event)
             case (WAIT_ABANDONED):
                 return;
             case (WAIT_TIMEOUT):
+#if defined(__linux__)
+                if (g_TriggerHeapDump)
+                {
+                    return;
+                }
+#endif
                 break;
             }
         }
@@ -638,6 +672,20 @@ VOID FinalizerThread::FinalizerThreadWorker(void *args)
 
         WaitForFinalizerEvent (hEventFinalizer);
 
+#if defined(__linux__)
+        if (g_TriggerHeapDump && (CLRGetTickCount64() > (LastHeapDumpTime + LINUX_HEAP_DUMP_TIME_OUT)))
+        {
+            s_forcedGCInProgress = true;
+            GetFinalizerThread()->DisablePreemptiveGC();
+            GCHeap::GetGCHeap()->GarbageCollect(2, FALSE, collection_blocking);
+            GetFinalizerThread()->EnablePreemptiveGC();
+            s_forcedGCInProgress = false;
+            
+            LastHeapDumpTime = CLRGetTickCount64();
+            g_TriggerHeapDump = FALSE;
+        }
+#endif
+
         if (!bPriorityBoosted)
         {
             if (GetFinalizerThread()->SetThreadPriority(THREAD_PRIORITY_HIGHEST))