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8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord

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Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate().

Reviewed-by: johnc, ysr
This commit is contained in:
Tao Mao 2013-03-05 15:36:56 -08:00 • committed by Tao Mao
parent f167bb36ab
commit 4bec822d40
3 changed files with 10 additions and 8 deletions
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6
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2013, 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
@ -252,12 +252,10 @@ inline bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) {
start_offset = _bm.get_next_one_offset(start_offset, end_offset);
while (start_offset < end_offset) {
HeapWord* obj_addr = offsetToHeapWord(start_offset);
oop obj = (oop) obj_addr;
if (!cl->do_bit(start_offset)) {
return false;
}
HeapWord* next_addr = MIN2(obj_addr + obj->size(), end_addr);
HeapWord* next_addr = MIN2(nextObject(offsetToHeapWord(start_offset)), end_addr);
BitMap::idx_t next_offset = heapWordToOffset(next_addr);
start_offset = _bm.get_next_one_offset(next_offset, end_offset);
}