src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp

rev 47365 : [mq]: oomalot.patch

*** 318,340 ****
    size_t size_with_fwdptr = size_no_fwdptr + BrooksPointer::word_size();
  
    assert(!heap_region_containing(p)->is_humongous(), "never evacuate humongous objects");
  
    bool alloc_from_gclab = true;
!   HeapWord* filler = allocate_from_gclab(thread, size_with_fwdptr);
!   if (filler == NULL) {
!     filler = allocate_memory(size_with_fwdptr, _alloc_shared_gc);
!     alloc_from_gclab = false;
!   }
! 
  #ifdef ASSERT
    // Checking that current Java thread does not hold Threads_lock when we get here.
    // If that ever be the case, we'd deadlock in oom_during_evacuation.
    if ((! Thread::current()->is_GC_task_thread()) && (! Thread::current()->is_ConcurrentGC_thread())) {
      assert(! Threads_lock->owned_by_self()
             || SafepointSynchronize::is_at_safepoint(), "must not hold Threads_lock here");
    }
  #endif
  
    if (filler == NULL) {
      oom_during_evacuation();
      // If this is a Java thread, it should have waited
--- 318,350 ----
    size_t size_with_fwdptr = size_no_fwdptr + BrooksPointer::word_size();
  
    assert(!heap_region_containing(p)->is_humongous(), "never evacuate humongous objects");
  
    bool alloc_from_gclab = true;
!   HeapWord* filler;
  #ifdef ASSERT
    // Checking that current Java thread does not hold Threads_lock when we get here.
    // If that ever be the case, we'd deadlock in oom_during_evacuation.
    if ((! Thread::current()->is_GC_task_thread()) && (! Thread::current()->is_ConcurrentGC_thread())) {
      assert(! Threads_lock->owned_by_self()
             || SafepointSynchronize::is_at_safepoint(), "must not hold Threads_lock here");
    }
+ 
+   if (ShenandoahOOMDuringEvacALot &&
+       (! Thread::current()->is_GC_task_thread()) &&
+       (! Thread::current()->is_ConcurrentGC_thread()) &&
+       (os::random() & 1) == 0) { // Simulate OOM every ~2nd slow-path call
+         filler = NULL;
+   } else {
+ #endif
+     filler = allocate_from_gclab(thread, size_with_fwdptr);
+     if (filler == NULL) {
+       filler = allocate_memory(size_with_fwdptr, _alloc_shared_gc);
+       alloc_from_gclab = false;
+     }
+ #ifdef ASSERT
+   }
  #endif
  
    if (filler == NULL) {
      oom_during_evacuation();
      // If this is a Java thread, it should have waited