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diff src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents 7baf47cb97cb
children ef9eda2c1abe c2844108a708
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Fri Oct 10 15:45:45 2014 +0200
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Fri Oct 10 15:51:58 2014 +0200
@@ -172,7 +172,7 @@
  private:
   void reset_from_card_cache(uint start_idx, size_t num_regions);
  public:
-  virtual void on_commit(uint start_idx, size_t num_regions);
+  virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
 };
 
 class G1CollectedHeap : public SharedHeap {