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comparison src/share/vm/gc_implementation/g1/heapRegion.cpp @ 4787:2ace1c4ee8da

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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 3b2b58fb1425
children b4ebad3520bb
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4786:1d6185f732aa 4787:2ace1c4ee8da
1 /* 1 /*
2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
573 573
574 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { 574 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) {
575 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); 575 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl);
576 } 576 }
577 577
578 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark,
579 bool during_conc_mark) {
580 // We always recreate the prev marking info and we'll explicitly
581 // mark all objects we find to be self-forwarded on the prev
582 // bitmap. So all objects need to be below PTAMS.
583 _prev_top_at_mark_start = top();
584 _prev_marked_bytes = 0;
585
586 if (during_initial_mark) {
587 // During initial-mark, we'll also explicitly mark all objects
588 // we find to be self-forwarded on the next bitmap. So all
589 // objects need to be below NTAMS.
590 _next_top_at_mark_start = top();
591 set_top_at_conc_mark_count(bottom());
592 _next_marked_bytes = 0;
593 } else if (during_conc_mark) {
594 // During concurrent mark, all objects in the CSet (including
595 // the ones we find to be self-forwarded) are implicitly live.
596 // So all objects need to be above NTAMS.
597 _next_top_at_mark_start = bottom();
598 set_top_at_conc_mark_count(bottom());
599 _next_marked_bytes = 0;
600 }
601 }
602
603 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark,
604 bool during_conc_mark,
605 size_t marked_bytes) {
606 assert(0 <= marked_bytes && marked_bytes <= used(),
607 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT,
608 marked_bytes, used()));
609 _prev_marked_bytes = marked_bytes;
610 }
611
578 HeapWord* 612 HeapWord*
579 HeapRegion::object_iterate_mem_careful(MemRegion mr, 613 HeapRegion::object_iterate_mem_careful(MemRegion mr,
580 ObjectClosure* cl) { 614 ObjectClosure* cl) {
581 G1CollectedHeap* g1h = G1CollectedHeap::heap(); 615 G1CollectedHeap* g1h = G1CollectedHeap::heap();
582 // We used to use "block_start_careful" here. But we're actually happy 616 // We used to use "block_start_careful" here. But we're actually happy