author | drwhite |
Thu, 02 Apr 2015 16:42:24 -0400 | |
changeset 30157 | e36165b16dde |
parent 29472 | 740ba666f6bb |
child 30162 | ba9738750a74 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2015, 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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|
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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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|
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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->hrm_index(); |
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assert(!hr->is_continues_humongous(), "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 - increment 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 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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// 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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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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147 |
return true; |
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148 |
} |
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149 |
return false; |
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150 |
} |
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151 |
|
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// Attempts to mark the given object and, if successful, counts |
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153 |
// the object in the task/worker counting structures for the |
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// given worker id. |
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155 |
inline bool ConcurrentMark::par_mark_and_count(oop obj, |
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156 |
size_t word_size, |
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157 |
HeapRegion* hr, |
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158 |
uint worker_id) { |
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HeapWord* addr = (HeapWord*)obj; |
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160 |
if (_nextMarkBitMap->parMark(addr)) { |
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161 |
MemRegion mr(addr, word_size); |
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count_region(mr, hr, worker_id); |
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163 |
return true; |
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164 |
} |
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165 |
return false; |
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166 |
} |
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167 |
|
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168 |
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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171 |
|
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172 |
if (end_addr > start_addr) { |
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173 |
// Right-open interval [start-offset, end-offset). |
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174 |
BitMap::idx_t start_offset = heapWordToOffset(start_addr); |
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BitMap::idx_t end_offset = heapWordToOffset(end_addr); |
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176 |
|
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177 |
start_offset = _bm.get_next_one_offset(start_offset, end_offset); |
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178 |
while (start_offset < end_offset) { |
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179 |
if (!cl->do_bit(start_offset)) { |
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180 |
return false; |
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181 |
} |
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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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184 |
start_offset = _bm.get_next_one_offset(next_offset, end_offset); |
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185 |
} |
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186 |
} |
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187 |
return true; |
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|
188 |
} |
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189 |
|
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190 |
inline bool CMBitMapRO::iterate(BitMapClosure* cl) { |
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191 |
MemRegion mr(startWord(), sizeInWords()); |
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192 |
return iterate(cl, mr); |
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193 |
} |
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194 |
|
26160 | 195 |
#define check_mark(addr) \ |
196 |
assert(_bmStartWord <= (addr) && (addr) < (_bmStartWord + _bmWordSize), \ |
|
197 |
"outside underlying space?"); \ |
|
198 |
assert(G1CollectedHeap::heap()->is_in_exact(addr), \ |
|
199 |
err_msg("Trying to access not available bitmap "PTR_FORMAT \ |
|
200 |
" corresponding to "PTR_FORMAT" (%u)", \ |
|
201 |
p2i(this), p2i(addr), G1CollectedHeap::heap()->addr_to_region(addr))); |
|
202 |
||
203 |
inline void CMBitMap::mark(HeapWord* addr) { |
|
204 |
check_mark(addr); |
|
205 |
_bm.set_bit(heapWordToOffset(addr)); |
|
206 |
} |
|
207 |
||
208 |
inline void CMBitMap::clear(HeapWord* addr) { |
|
209 |
check_mark(addr); |
|
210 |
_bm.clear_bit(heapWordToOffset(addr)); |
|
211 |
} |
|
212 |
||
213 |
inline bool CMBitMap::parMark(HeapWord* addr) { |
|
214 |
check_mark(addr); |
|
215 |
return _bm.par_set_bit(heapWordToOffset(addr)); |
|
216 |
} |
|
217 |
||
218 |
inline bool CMBitMap::parClear(HeapWord* addr) { |
|
219 |
check_mark(addr); |
|
220 |
return _bm.par_clear_bit(heapWordToOffset(addr)); |
|
221 |
} |
|
222 |
||
223 |
#undef check_mark |
|
224 |
||
9994 | 225 |
inline void CMTask::push(oop obj) { |
226 |
HeapWord* objAddr = (HeapWord*) obj; |
|
227 |
assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); |
|
228 |
assert(!_g1h->is_on_master_free_list( |
|
229 |
_g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); |
|
230 |
assert(!_g1h->is_obj_ill(obj), "invariant"); |
|
231 |
assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); |
|
232 |
||
233 |
if (_cm->verbose_high()) { |
|
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234 |
gclog_or_tty->print_cr("[%u] pushing " PTR_FORMAT, _worker_id, p2i((void*) obj)); |
9994 | 235 |
} |
236 |
||
237 |
if (!_task_queue->push(obj)) { |
|
238 |
// The local task queue looks full. We need to push some entries |
|
239 |
// to the global stack. |
|
240 |
||
241 |
if (_cm->verbose_medium()) { |
|
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242 |
gclog_or_tty->print_cr("[%u] task queue overflow, " |
9994 | 243 |
"moving entries to the global stack", |
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244 |
_worker_id); |
9994 | 245 |
} |
246 |
move_entries_to_global_stack(); |
|
247 |
||
248 |
// this should succeed since, even if we overflow the global |
|
249 |
// stack, we should have definitely removed some entries from the |
|
250 |
// local queue. So, there must be space on it. |
|
251 |
bool success = _task_queue->push(obj); |
|
252 |
assert(success, "invariant"); |
|
253 |
} |
|
254 |
||
29472 | 255 |
statsOnly( size_t tmp_size = (size_t)_task_queue->size(); |
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256 |
if (tmp_size > _local_max_size) { |
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_local_max_size = tmp_size; |
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258 |
} |
9994 | 259 |
++_local_pushes ); |
260 |
} |
|
261 |
||
262 |
// This determines whether the method below will check both the local |
|
263 |
// and global fingers when determining whether to push on the stack a |
|
264 |
// gray object (value 1) or whether it will only check the global one |
|
265 |
// (value 0). The tradeoffs are that the former will be a bit more |
|
266 |
// accurate and possibly push less on the stack, but it might also be |
|
267 |
// a little bit slower. |
|
268 |
||
269 |
#define _CHECK_BOTH_FINGERS_ 1 |
|
270 |
||
271 |
inline void CMTask::deal_with_reference(oop obj) { |
|
272 |
if (_cm->verbose_high()) { |
|
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273 |
gclog_or_tty->print_cr("[%u] we're dealing with reference = "PTR_FORMAT, |
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274 |
_worker_id, p2i((void*) obj)); |
9994 | 275 |
} |
276 |
||
277 |
++_refs_reached; |
|
278 |
||
279 |
HeapWord* objAddr = (HeapWord*) obj; |
|
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280 |
assert(obj->is_oop_or_null(true /* ignore mark word */), err_msg("Expected an oop or NULL at " PTR_FORMAT, p2i(obj))); |
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281 |
if (_g1h->is_in_g1_reserved(objAddr)) { |
9994 | 282 |
assert(obj != NULL, "null check is implicit"); |
283 |
if (!_nextMarkBitMap->isMarked(objAddr)) { |
|
284 |
// Only get the containing region if the object is not marked on the |
|
285 |
// bitmap (otherwise, it's a waste of time since we won't do |
|
286 |
// anything with it). |
|
287 |
HeapRegion* hr = _g1h->heap_region_containing_raw(obj); |
|
288 |
if (!hr->obj_allocated_since_next_marking(obj)) { |
|
289 |
if (_cm->verbose_high()) { |
|
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290 |
gclog_or_tty->print_cr("[%u] "PTR_FORMAT" is not considered marked", |
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|
291 |
_worker_id, p2i((void*) obj)); |
9994 | 292 |
} |
293 |
||
294 |
// we need to mark it first |
|
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295 |
if (_cm->par_mark_and_count(obj, hr, _marked_bytes_array, _card_bm)) { |
9994 | 296 |
// No OrderAccess:store_load() is needed. It is implicit in the |
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297 |
// CAS done in CMBitMap::parMark() call in the routine above. |
9994 | 298 |
HeapWord* global_finger = _cm->finger(); |
299 |
||
300 |
#if _CHECK_BOTH_FINGERS_ |
|
301 |
// we will check both the local and global fingers |
|
302 |
||
303 |
if (_finger != NULL && objAddr < _finger) { |
|
304 |
if (_cm->verbose_high()) { |
|
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|
305 |
gclog_or_tty->print_cr("[%u] below the local finger ("PTR_FORMAT"), " |
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|
306 |
"pushing it", _worker_id, p2i(_finger)); |
9994 | 307 |
} |
308 |
push(obj); |
|
309 |
} else if (_curr_region != NULL && objAddr < _region_limit) { |
|
310 |
// do nothing |
|
311 |
} else if (objAddr < global_finger) { |
|
312 |
// Notice that the global finger might be moving forward |
|
313 |
// concurrently. This is not a problem. In the worst case, we |
|
314 |
// mark the object while it is above the global finger and, by |
|
315 |
// the time we read the global finger, it has moved forward |
|
316 |
// passed this object. In this case, the object will probably |
|
317 |
// be visited when a task is scanning the region and will also |
|
318 |
// be pushed on the stack. So, some duplicate work, but no |
|
319 |
// correctness problems. |
|
320 |
||
321 |
if (_cm->verbose_high()) { |
|
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|
322 |
gclog_or_tty->print_cr("[%u] below the global finger " |
9994 | 323 |
"("PTR_FORMAT"), pushing it", |
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|
324 |
_worker_id, p2i(global_finger)); |
9994 | 325 |
} |
326 |
push(obj); |
|
327 |
} else { |
|
328 |
// do nothing |
|
329 |
} |
|
330 |
#else // _CHECK_BOTH_FINGERS_ |
|
331 |
// we will only check the global finger |
|
332 |
||
333 |
if (objAddr < global_finger) { |
|
334 |
// see long comment above |
|
335 |
||
336 |
if (_cm->verbose_high()) { |
|
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|
337 |
gclog_or_tty->print_cr("[%u] below the global finger " |
9994 | 338 |
"("PTR_FORMAT"), pushing it", |
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|
339 |
_worker_id, p2i(global_finger)); |
9994 | 340 |
} |
341 |
push(obj); |
|
342 |
} |
|
343 |
#endif // _CHECK_BOTH_FINGERS_ |
|
344 |
} |
|
345 |
} |
|
346 |
} |
|
347 |
} |
|
348 |
} |
|
349 |
||
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|
350 |
inline void ConcurrentMark::markPrev(oop p) { |
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|
351 |
assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity"); |
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|
352 |
// Note we are overriding the read-only view of the prev map here, via |
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|
353 |
// the cast. |
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|
354 |
((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p); |
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|
355 |
} |
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|
356 |
|
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inline void ConcurrentMark::grayRoot(oop obj, size_t word_size, |
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uint worker_id, HeapRegion* hr) { |
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assert(obj != NULL, "pre-condition"); |
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HeapWord* addr = (HeapWord*) obj; |
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if (hr == NULL) { |
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hr = _g1h->heap_region_containing_raw(addr); |
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} else { |
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assert(hr->is_in(addr), "pre-condition"); |
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} |
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assert(hr != NULL, "sanity"); |
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// Given that we're looking for a region that contains an object |
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// header it's impossible to get back a HC region. |
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assert(!hr->is_continues_humongous(), "sanity"); |
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|
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// We cannot assert that word_size == obj->size() given that obj |
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// might not be in a consistent state (another thread might be in |
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// the process of copying it). So the best thing we can do is to |
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// assert that word_size is under an upper bound which is its |
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// containing region's capacity. |
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assert(word_size * HeapWordSize <= hr->capacity(), |
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err_msg("size: "SIZE_FORMAT" capacity: "SIZE_FORMAT" "HR_FORMAT, |
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word_size * HeapWordSize, hr->capacity(), |
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HR_FORMAT_PARAMS(hr))); |
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|
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if (addr < hr->next_top_at_mark_start()) { |
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if (!_nextMarkBitMap->isMarked(addr)) { |
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par_mark_and_count(obj, word_size, hr, worker_id); |
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} |
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} |
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} |
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|
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |