Fragmented young heap generation and off_heap_message_queue option

* The youngest generation of the heap can now consist of multiple
  blocks. Heap fragments and message fragments are added to the
  youngest generation when needed without triggering a GC. After
  a GC the youngest generation is contained in one single block.
* The off_heap_message_queue process flag has been added. When
  enabled all message data in the queue is kept off heap. When
  a message is selected from the queue, the message fragment (or
  heap fragment) containing the actual message is attached to the
  youngest generation. Messages stored off heap is not part of GC.

1 files changed, 4 insertions, 2 deletions

diff --git a/erts/emulator/beam/erl_debug.c b/erts/emulator/beam/erl_debug.c
index 434b6c6d7a..6652ef9bb3 100644
--- a/erts/emulator/beam/erl_debug.c
+++ b/erts/emulator/beam/erl_debug.c
@@ -309,6 +309,8 @@ void erts_check_for_holes(Process* p)
     p->last_htop = HEAP_TOP(p);
 
     for (hf = MBUF(p); hf != 0; hf = hf->next) {
+	if (hf == p->heap_hfrag)
+	    continue;
 	if (hf == p->last_mbuf) {
 	    break;
 	}
@@ -399,7 +401,7 @@ void verify_process(Process *p)
         erl_exit(1,"Wild pointer found in " name " of %T!\n",p->common.id); }
 
 
-    ErlMessage* mp = p->msg.first;
+    ErtsMessage* mp = p->msg.first;
 
     VERBOSE(DEBUG_MEMORY,("Verify process: %T...\n",p->common.id));
 
@@ -528,7 +530,7 @@ static void print_process_memory(Process *p)
                 PTR_SIZE, "PCB", dashes, dashes, dashes, dashes);
 
     if (p->msg.first != NULL) {
-        ErlMessage* mp;
+        ErtsMessage* mp;
         erts_printf("  Message Queue:\n");
         mp = p->msg.first;
         while (mp != NULL) {