author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 20309 | 7445302daff6 |
child 22551 | 9bf46d16dcc6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |
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#include "gc_implementation/g1/concurrentMark.hpp" |
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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// Utility routine to set an exclusive range of cards on the given |
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// card liveness bitmap |
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inline void ConcurrentMark::set_card_bitmap_range(BitMap* card_bm, |
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BitMap::idx_t start_idx, |
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BitMap::idx_t end_idx, |
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bool is_par) { |
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|
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// Set the exclusive bit range [start_idx, end_idx). |
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assert((end_idx - start_idx) > 0, "at least one card"); |
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assert(end_idx <= card_bm->size(), "sanity"); |
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|
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// Silently clip the end index |
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end_idx = MIN2(end_idx, card_bm->size()); |
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// For small ranges use a simple loop; otherwise use set_range or |
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// use par_at_put_range (if parallel). The range is made up of the |
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// cards that are spanned by an object/mem region so 8 cards will |
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// allow up to object sizes up to 4K to be handled using the loop. |
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if ((end_idx - start_idx) <= 8) { |
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for (BitMap::idx_t i = start_idx; i < end_idx; i += 1) { |
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if (is_par) { |
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card_bm->par_set_bit(i); |
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} else { |
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card_bm->set_bit(i); |
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} |
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} |
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} else { |
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// Note BitMap::par_at_put_range() and BitMap::set_range() are exclusive. |
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if (is_par) { |
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card_bm->par_at_put_range(start_idx, end_idx, true); |
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} else { |
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card_bm->set_range(start_idx, end_idx); |
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} |
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} |
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} |
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// Returns the index in the liveness accounting card bitmap |
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// for the given address |
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inline BitMap::idx_t ConcurrentMark::card_bitmap_index_for(HeapWord* addr) { |
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// Below, the term "card num" means the result of shifting an address |
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// by the card shift -- address 0 corresponds to card number 0. One |
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// must subtract the card num of the bottom of the heap to obtain a |
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// card table index. |
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intptr_t card_num = intptr_t(uintptr_t(addr) >> CardTableModRefBS::card_shift); |
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return card_num - heap_bottom_card_num(); |
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} |
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// Counts the given memory region in the given task/worker |
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// counting data structures. |
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inline void ConcurrentMark::count_region(MemRegion mr, HeapRegion* hr, |
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size_t* marked_bytes_array, |
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BitMap* task_card_bm) { |
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G1CollectedHeap* g1h = _g1h; |
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CardTableModRefBS* ct_bs = g1h->g1_barrier_set(); |
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HeapWord* start = mr.start(); |
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HeapWord* end = mr.end(); |
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size_t region_size_bytes = mr.byte_size(); |
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uint index = hr->hrs_index(); |
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assert(!hr->continuesHumongous(), "should not be HC region"); |
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assert(hr == g1h->heap_region_containing(start), "sanity"); |
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assert(hr == g1h->heap_region_containing(mr.last()), "sanity"); |
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assert(marked_bytes_array != NULL, "pre-condition"); |
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assert(task_card_bm != NULL, "pre-condition"); |
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// Add to the task local marked bytes for this region. |
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marked_bytes_array[index] += region_size_bytes; |
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BitMap::idx_t start_idx = card_bitmap_index_for(start); |
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BitMap::idx_t end_idx = card_bitmap_index_for(end); |
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// Note: if we're looking at the last region in heap - end |
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// could be actually just beyond the end of the heap; end_idx |
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// will then correspond to a (non-existent) card that is also |
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// just beyond the heap. |
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if (g1h->is_in_g1_reserved(end) && !ct_bs->is_card_aligned(end)) { |
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// end of region is not card aligned - incremement to cover |
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// all the cards spanned by the region. |
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end_idx += 1; |
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} |
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// The card bitmap is task/worker specific => no need to use |
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// the 'par' BitMap routines. |
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// Set bits in the exclusive bit range [start_idx, end_idx). |
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set_card_bitmap_range(task_card_bm, start_idx, end_idx, false /* is_par */); |
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} |
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// Counts the given memory region in the task/worker counting |
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// data structures for the given worker id. |
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inline void ConcurrentMark::count_region(MemRegion mr, |
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HeapRegion* hr, |
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uint worker_id) { |
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size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id); |
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BitMap* task_card_bm = count_card_bitmap_for(worker_id); |
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count_region(mr, hr, marked_bytes_array, task_card_bm); |
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} |
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// Counts the given memory region, which may be a single object, in the |
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// task/worker counting data structures for the given worker id. |
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inline void ConcurrentMark::count_region(MemRegion mr, uint worker_id) { |
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HeapWord* addr = mr.start(); |
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HeapRegion* hr = _g1h->heap_region_containing_raw(addr); |
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count_region(mr, hr, worker_id); |
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} |
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// Counts the given object in the given task/worker counting data structures. |
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inline void ConcurrentMark::count_object(oop obj, |
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HeapRegion* hr, |
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size_t* marked_bytes_array, |
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BitMap* task_card_bm) { |
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MemRegion mr((HeapWord*)obj, obj->size()); |
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count_region(mr, hr, marked_bytes_array, task_card_bm); |
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} |
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|
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// Counts the given object in the task/worker counting data |
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// structures for the given worker id. |
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inline void ConcurrentMark::count_object(oop obj, |
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HeapRegion* hr, |
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uint worker_id) { |
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size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id); |
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BitMap* task_card_bm = count_card_bitmap_for(worker_id); |
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HeapWord* addr = (HeapWord*) obj; |
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count_object(obj, hr, marked_bytes_array, task_card_bm); |
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} |
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|
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// Attempts to mark the given object and, if successful, counts |
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// the object in the given task/worker counting structures. |
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158 |
inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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HeapRegion* hr, |
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size_t* marked_bytes_array, |
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BitMap* task_card_bm) { |
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HeapWord* addr = (HeapWord*)obj; |
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if (_nextMarkBitMap->parMark(addr)) { |
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// Update the task specific count data for the object. |
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count_object(obj, hr, marked_bytes_array, task_card_bm); |
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return true; |
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} |
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return false; |
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169 |
} |
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|
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// Attempts to mark the given object and, if successful, counts |
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// the object in the task/worker counting structures for the |
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// given worker id. |
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174 |
inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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size_t word_size, |
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HeapRegion* hr, |
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uint worker_id) { |
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HeapWord* addr = (HeapWord*)obj; |
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if (_nextMarkBitMap->parMark(addr)) { |
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MemRegion mr(addr, word_size); |
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count_region(mr, hr, worker_id); |
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return true; |
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183 |
} |
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return false; |
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185 |
} |
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186 |
|
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// Attempts to mark the given object and, if successful, counts |
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// the object in the task/worker counting structures for the |
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// given worker id. |
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190 |
inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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HeapRegion* hr, |
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uint worker_id) { |
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HeapWord* addr = (HeapWord*)obj; |
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if (_nextMarkBitMap->parMark(addr)) { |
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// Update the task specific count data for the object. |
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count_object(obj, hr, worker_id); |
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return true; |
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198 |
} |
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199 |
return false; |
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200 |
} |
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201 |
|
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// As above - but we don't know the heap region containing the |
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// object and so have to supply it. |
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204 |
inline bool ConcurrentMark::par_mark_and_count(oop obj, uint worker_id) { |
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HeapWord* addr = (HeapWord*)obj; |
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HeapRegion* hr = _g1h->heap_region_containing_raw(addr); |
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return par_mark_and_count(obj, hr, worker_id); |
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208 |
} |
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209 |
|
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// Similar to the above routine but we already know the size, in words, of |
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// the object that we wish to mark/count |
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212 |
inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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size_t word_size, |
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uint worker_id) { |
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HeapWord* addr = (HeapWord*)obj; |
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if (_nextMarkBitMap->parMark(addr)) { |
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// Update the task specific count data for the object. |
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MemRegion mr(addr, word_size); |
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count_region(mr, worker_id); |
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220 |
return true; |
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221 |
} |
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222 |
return false; |
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223 |
} |
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224 |
|
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225 |
// Unconditionally mark the given object, and unconditinally count |
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// the object in the counting structures for worker id 0. |
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227 |
// Should *not* be called from parallel code. |
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228 |
inline bool ConcurrentMark::mark_and_count(oop obj, HeapRegion* hr) { |
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HeapWord* addr = (HeapWord*)obj; |
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_nextMarkBitMap->mark(addr); |
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// Update the task specific count data for the object. |
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count_object(obj, hr, 0 /* worker_id */); |
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233 |
return true; |
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234 |
} |
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235 |
|
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236 |
// As above - but we don't have the heap region containing the |
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// object, so we have to supply it. |
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238 |
inline bool ConcurrentMark::mark_and_count(oop obj) { |
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HeapWord* addr = (HeapWord*)obj; |
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HeapRegion* hr = _g1h->heap_region_containing_raw(addr); |
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241 |
return mark_and_count(obj, hr); |
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242 |
} |
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243 |
|
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244 |
inline bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { |
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HeapWord* start_addr = MAX2(startWord(), mr.start()); |
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HeapWord* end_addr = MIN2(endWord(), mr.end()); |
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247 |
|
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248 |
if (end_addr > start_addr) { |
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249 |
// Right-open interval [start-offset, end-offset). |
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BitMap::idx_t start_offset = heapWordToOffset(start_addr); |
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BitMap::idx_t end_offset = heapWordToOffset(end_addr); |
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252 |
|
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start_offset = _bm.get_next_one_offset(start_offset, end_offset); |
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254 |
while (start_offset < end_offset) { |
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255 |
if (!cl->do_bit(start_offset)) { |
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256 |
return false; |
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257 |
} |
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HeapWord* next_addr = MIN2(nextObject(offsetToHeapWord(start_offset)), end_addr); |
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BitMap::idx_t next_offset = heapWordToOffset(next_addr); |
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start_offset = _bm.get_next_one_offset(next_offset, end_offset); |
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} |
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} |
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return true; |
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264 |
} |
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265 |
|
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inline bool CMBitMapRO::iterate(BitMapClosure* cl) { |
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MemRegion mr(startWord(), sizeInWords()); |
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return iterate(cl, mr); |
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} |
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|
9994 | 271 |
inline void CMTask::push(oop obj) { |
272 |
HeapWord* objAddr = (HeapWord*) obj; |
|
273 |
assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); |
|
274 |
assert(!_g1h->is_on_master_free_list( |
|
275 |
_g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); |
|
276 |
assert(!_g1h->is_obj_ill(obj), "invariant"); |
|
277 |
assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); |
|
278 |
||
279 |
if (_cm->verbose_high()) { |
|
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gclog_or_tty->print_cr("[%u] pushing "PTR_FORMAT, _worker_id, (void*) obj); |
9994 | 281 |
} |
282 |
||
283 |
if (!_task_queue->push(obj)) { |
|
284 |
// The local task queue looks full. We need to push some entries |
|
285 |
// to the global stack. |
|
286 |
||
287 |
if (_cm->verbose_medium()) { |
|
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288 |
gclog_or_tty->print_cr("[%u] task queue overflow, " |
9994 | 289 |
"moving entries to the global stack", |
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290 |
_worker_id); |
9994 | 291 |
} |
292 |
move_entries_to_global_stack(); |
|
293 |
||
294 |
// this should succeed since, even if we overflow the global |
|
295 |
// stack, we should have definitely removed some entries from the |
|
296 |
// local queue. So, there must be space on it. |
|
297 |
bool success = _task_queue->push(obj); |
|
298 |
assert(success, "invariant"); |
|
299 |
} |
|
300 |
||
301 |
statsOnly( int tmp_size = _task_queue->size(); |
|
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if (tmp_size > _local_max_size) { |
9994 | 303 |
_local_max_size = tmp_size; |
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} |
9994 | 305 |
++_local_pushes ); |
306 |
} |
|
307 |
||
308 |
// This determines whether the method below will check both the local |
|
309 |
// and global fingers when determining whether to push on the stack a |
|
310 |
// gray object (value 1) or whether it will only check the global one |
|
311 |
// (value 0). The tradeoffs are that the former will be a bit more |
|
312 |
// accurate and possibly push less on the stack, but it might also be |
|
313 |
// a little bit slower. |
|
314 |
||
315 |
#define _CHECK_BOTH_FINGERS_ 1 |
|
316 |
||
317 |
inline void CMTask::deal_with_reference(oop obj) { |
|
318 |
if (_cm->verbose_high()) { |
|
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gclog_or_tty->print_cr("[%u] we're dealing with reference = "PTR_FORMAT, |
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320 |
_worker_id, (void*) obj); |
9994 | 321 |
} |
322 |
||
323 |
++_refs_reached; |
|
324 |
||
325 |
HeapWord* objAddr = (HeapWord*) obj; |
|
326 |
assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
|
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327 |
if (_g1h->is_in_g1_reserved(objAddr)) { |
9994 | 328 |
assert(obj != NULL, "null check is implicit"); |
329 |
if (!_nextMarkBitMap->isMarked(objAddr)) { |
|
330 |
// Only get the containing region if the object is not marked on the |
|
331 |
// bitmap (otherwise, it's a waste of time since we won't do |
|
332 |
// anything with it). |
|
333 |
HeapRegion* hr = _g1h->heap_region_containing_raw(obj); |
|
334 |
if (!hr->obj_allocated_since_next_marking(obj)) { |
|
335 |
if (_cm->verbose_high()) { |
|
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336 |
gclog_or_tty->print_cr("[%u] "PTR_FORMAT" is not considered marked", |
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337 |
_worker_id, (void*) obj); |
9994 | 338 |
} |
339 |
||
340 |
// we need to mark it first |
|
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341 |
if (_cm->par_mark_and_count(obj, hr, _marked_bytes_array, _card_bm)) { |
9994 | 342 |
// No OrderAccess:store_load() is needed. It is implicit in the |
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343 |
// CAS done in CMBitMap::parMark() call in the routine above. |
9994 | 344 |
HeapWord* global_finger = _cm->finger(); |
345 |
||
346 |
#if _CHECK_BOTH_FINGERS_ |
|
347 |
// we will check both the local and global fingers |
|
348 |
||
349 |
if (_finger != NULL && objAddr < _finger) { |
|
350 |
if (_cm->verbose_high()) { |
|
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351 |
gclog_or_tty->print_cr("[%u] below the local finger ("PTR_FORMAT"), " |
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|
352 |
"pushing it", _worker_id, _finger); |
9994 | 353 |
} |
354 |
push(obj); |
|
355 |
} else if (_curr_region != NULL && objAddr < _region_limit) { |
|
356 |
// do nothing |
|
357 |
} else if (objAddr < global_finger) { |
|
358 |
// Notice that the global finger might be moving forward |
|
359 |
// concurrently. This is not a problem. In the worst case, we |
|
360 |
// mark the object while it is above the global finger and, by |
|
361 |
// the time we read the global finger, it has moved forward |
|
362 |
// passed this object. In this case, the object will probably |
|
363 |
// be visited when a task is scanning the region and will also |
|
364 |
// be pushed on the stack. So, some duplicate work, but no |
|
365 |
// correctness problems. |
|
366 |
||
367 |
if (_cm->verbose_high()) { |
|
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368 |
gclog_or_tty->print_cr("[%u] below the global finger " |
9994 | 369 |
"("PTR_FORMAT"), pushing it", |
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|
370 |
_worker_id, global_finger); |
9994 | 371 |
} |
372 |
push(obj); |
|
373 |
} else { |
|
374 |
// do nothing |
|
375 |
} |
|
376 |
#else // _CHECK_BOTH_FINGERS_ |
|
377 |
// we will only check the global finger |
|
378 |
||
379 |
if (objAddr < global_finger) { |
|
380 |
// see long comment above |
|
381 |
||
382 |
if (_cm->verbose_high()) { |
|
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|
383 |
gclog_or_tty->print_cr("[%u] below the global finger " |
9994 | 384 |
"("PTR_FORMAT"), pushing it", |
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|
385 |
_worker_id, global_finger); |
9994 | 386 |
} |
387 |
push(obj); |
|
388 |
} |
|
389 |
#endif // _CHECK_BOTH_FINGERS_ |
|
390 |
} |
|
391 |
} |
|
392 |
} |
|
393 |
} |
|
394 |
} |
|
395 |
||
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396 |
inline void ConcurrentMark::markPrev(oop p) { |
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397 |
assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity"); |
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|
398 |
// Note we are overriding the read-only view of the prev map here, via |
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|
399 |
// the cast. |
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|
400 |
((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p); |
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|
401 |
} |
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|
402 |
|
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|
403 |
inline void ConcurrentMark::grayRoot(oop obj, size_t word_size, |
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404 |
uint worker_id, HeapRegion* hr) { |
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|
405 |
assert(obj != NULL, "pre-condition"); |
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|
406 |
HeapWord* addr = (HeapWord*) obj; |
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|
407 |
if (hr == NULL) { |
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|
408 |
hr = _g1h->heap_region_containing_raw(addr); |
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|
409 |
} else { |
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|
410 |
assert(hr->is_in(addr), "pre-condition"); |
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|
411 |
} |
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|
412 |
assert(hr != NULL, "sanity"); |
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|
413 |
// Given that we're looking for a region that contains an object |
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|
414 |
// header it's impossible to get back a HC region. |
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|
415 |
assert(!hr->continuesHumongous(), "sanity"); |
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|
416 |
|
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|
417 |
// We cannot assert that word_size == obj->size() given that obj |
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|
418 |
// might not be in a consistent state (another thread might be in |
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|
419 |
// the process of copying it). So the best thing we can do is to |
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|
420 |
// assert that word_size is under an upper bound which is its |
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|
421 |
// containing region's capacity. |
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|
422 |
assert(word_size * HeapWordSize <= hr->capacity(), |
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|
423 |
err_msg("size: "SIZE_FORMAT" capacity: "SIZE_FORMAT" "HR_FORMAT, |
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|
424 |
word_size * HeapWordSize, hr->capacity(), |
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|
425 |
HR_FORMAT_PARAMS(hr))); |
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|
426 |
|
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|
427 |
if (addr < hr->next_top_at_mark_start()) { |
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|
428 |
if (!_nextMarkBitMap->isMarked(addr)) { |
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|
429 |
par_mark_and_count(obj, word_size, hr, worker_id); |
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|
430 |
} |
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|
431 |
} |
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|
432 |
} |
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|
433 |
|
9994 | 434 |
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |