--- old/src/share/vm/gc_implementation/shared/plab.cpp	2015-04-20 11:16:57.618275548 -0700
+++ new/src/share/vm/gc_implementation/shared/plab.cpp	2015-04-20 11:16:57.526275546 -0700
@@ -84,10 +84,17 @@
   return result;
 }
 
-// Compute desired plab size and latch result for later
+// Calculates plab size for current number of gc worker threads.
+size_t PLABStats::desired_plab_sz(uint no_of_gc_workers) {
+  assert(no_of_gc_workers > 0, "Number of GC workers should be larger than zero");
+
+  return align_object_size(_desired_net_plab_sz / MAX2(no_of_gc_workers, 1U));
+}
+
+// Compute desired plab size for one gc worker thread and latch result for later
 // use. This should be called once at the end of parallel
 // scavenge; it clears the sensor accumulators.
-void PLABStats::adjust_desired_plab_sz(uint no_of_gc_workers) {
+void PLABStats::adjust_desired_plab_sz() {
   assert(ResizePLAB, "Not set");
 
   assert(is_object_aligned(max_size()) && min_size() <= max_size(),
@@ -109,7 +116,8 @@
     target_refills = 1;
   }
   size_t used = _allocated - _wasted - _unused;
-  size_t recent_plab_sz = used / (target_refills * no_of_gc_workers);
+  // Assumed to have 1 gc worker thread
+  size_t recent_plab_sz = used / target_refills;
   // Take historical weighted average
   _filter.sample(recent_plab_sz);
   // Clip from above and below, and align to object boundary
@@ -120,7 +128,7 @@
   if (PrintPLAB) {
     gclog_or_tty->print(" (plab_sz = " SIZE_FORMAT" desired_plab_sz = " SIZE_FORMAT") ", recent_plab_sz, new_plab_sz);
   }
-  _desired_plab_sz = new_plab_sz;
+  _desired_net_plab_sz = new_plab_sz;
 
   reset();
 }