O3: If there is an outstanding table walk don't let the inst queue sleep.

If there is an outstanding table walk and no other activity in the CPU
it can go to sleep and never wake up. This change makes the instruction
queue always active if the CPU is waiting for a store to translate.

If Gabe changes the way this code works then the below should be removed
as indicated by the todo.

diff --git a/src/cpu/o3/inst_queue_impl.hh b/src/cpu/o3/inst_queue_impl.hh
index aa21a0edc81a4d3df140692361e56e08c15717b7..1a211af7aa1c6e2773b3a1b2039768c9ccce46f0 100644 (file)
--- a/src/cpu/o3/inst_queue_impl.hh
+++ b/src/cpu/o3/inst_queue_impl.hh
@@ -880,7 +880,10 @@ InstructionQueue<Impl>::scheduleReadyInsts()
     iqInstsIssued+= total_issued;
 
     // If we issued any instructions, tell the CPU we had activity.
-    if (total_issued || total_deferred_mem_issued) {
+    // @todo If the way deferred memory instructions are handeled due to
+    // translation changes then the deferredMemInsts condition should be removed
+    // from the code below.
+    if (total_issued || total_deferred_mem_issued || deferredMemInsts.size()) {
         cpu->activityThisCycle();
     } else {
         DPRINTF(IQ, "Not able to schedule any instructions.\n");