PPC/s390: [heap] New heuristics for incremental marking step size.

src/s390/code-stubs-s390.cc

Index: src/s390/code-stubs-s390.cc
diff --git a/src/s390/code-stubs-s390.cc b/src/s390/code-stubs-s390.cc
index 111b317bd77e02cb4dfb5bbd1ee46e2359d6bebc..2fc81a1d56a6377ca71feabc764107fef0a0ac32 100644
--- a/src/s390/code-stubs-s390.cc
+++ b/src/s390/code-stubs-s390.cc
@@ -3325,18 +3325,6 @@ void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
   Label need_incremental;
   Label need_incremental_pop_scratch;
 
-  DCHECK((~Page::kPageAlignmentMask & 0xffff) == 0);
-  __ AndP(regs_.scratch0(), regs_.object(), Operand(~Page::kPageAlignmentMask));
-  __ LoadP(
-      regs_.scratch1(),
-      MemOperand(regs_.scratch0(), MemoryChunk::kWriteBarrierCounterOffset));
-  __ SubP(regs_.scratch1(), regs_.scratch1(), Operand(1));
-  __ StoreP(
-      regs_.scratch1(),
-      MemOperand(regs_.scratch0(), MemoryChunk::kWriteBarrierCounterOffset));
-  __ CmpP(regs_.scratch1(), Operand::Zero());  // S390, we could do better here
-  __ blt(&need_incremental);
-
   // Let's look at the color of the object:  If it is not black we don't have
   // to inform the incremental marker.
   __ JumpIfBlack(regs_.object(), regs_.scratch0(), regs_.scratch1(), &on_black);