Mercurial > hg > graal-compiler
diff src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 4787:2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object).
Reviewed-by: johnc, brutisso
author | tonyp |
---|---|
date | Tue, 10 Jan 2012 18:58:13 -0500 |
parents | 811ec3d0833b |
children | d30fa85f9994 |
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--- a/src/share/vm/gc_implementation/g1/g1OopClosures.hpp Tue Jan 10 20:02:41 2012 +0100 +++ b/src/share/vm/gc_implementation/g1/g1OopClosures.hpp Tue Jan 10 18:58:13 2012 -0500 @@ -1,5 +1,5 @@ /* - * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it @@ -121,17 +121,25 @@ class G1ParCopyHelper : public G1ParClosureSuper { G1ParScanClosure *_scanner; protected: - template <class T> void mark_object(T* p); - oop copy_to_survivor_space(oop obj, bool should_mark_root, - bool should_mark_copy); + // Mark the object if it's not already marked. This is used to mark + // objects pointed to by roots that are guaranteed not to move + // during the GC (i.e., non-CSet objects). It is MT-safe. + void mark_object(oop obj); + + // Mark the object if it's not already marked. This is used to mark + // objects pointed to by roots that have been forwarded during a + // GC. It is MT-safe. + void mark_forwarded_object(oop from_obj, oop to_obj); + + oop copy_to_survivor_space(oop obj); + public: G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, G1ParScanClosure *scanner) : G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { } }; -template<bool do_gen_barrier, G1Barrier barrier, - bool do_mark_object> +template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> class G1ParCopyClosure : public G1ParCopyHelper { G1ParScanClosure _scanner; @@ -140,9 +148,8 @@ public: G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : - _scanner(g1, par_scan_state, rp), - G1ParCopyHelper(g1, par_scan_state, &_scanner) - { + _scanner(g1, par_scan_state, rp), + G1ParCopyHelper(g1, par_scan_state, &_scanner) { assert(_ref_processor == NULL, "sanity"); }