author | brutisso |
Fri, 01 Apr 2016 10:16:31 +0200 | |
changeset 37238 | 3d0a96116bff |
parent 35862 | 411842d0c882 |
child 37495 | 7ef1f23dfc9c |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2000, 2016, 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_SHARED_SPACE_INLINE_HPP |
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#define SHARE_VM_GC_SHARED_SPACE_INLINE_HPP |
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#include "gc/serial/markSweep.inline.hpp" |
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#include "gc/shared/collectedHeap.hpp" |
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#include "gc/shared/generation.hpp" |
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#include "gc/shared/space.hpp" |
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#include "gc/shared/spaceDecorator.hpp" |
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#include "memory/universe.hpp" |
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#include "runtime/prefetch.inline.hpp" |
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#include "runtime/safepoint.hpp" |
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inline HeapWord* Space::block_start(const void* p) { |
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return block_start_const(p); |
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} |
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inline HeapWord* OffsetTableContigSpace::allocate(size_t size) { |
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HeapWord* res = ContiguousSpace::allocate(size); |
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if (res != NULL) { |
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_offsets.alloc_block(res, size); |
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} |
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return res; |
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} |
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// Because of the requirement of keeping "_offsets" up to date with the |
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// allocations, we sequentialize these with a lock. Therefore, best if |
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// this is used for larger LAB allocations only. |
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inline HeapWord* OffsetTableContigSpace::par_allocate(size_t size) { |
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MutexLocker x(&_par_alloc_lock); |
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// This ought to be just "allocate", because of the lock above, but that |
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// ContiguousSpace::allocate asserts that either the allocating thread |
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// holds the heap lock or it is the VM thread and we're at a safepoint. |
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// The best I (dld) could figure was to put a field in ContiguousSpace |
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// meaning "locking at safepoint taken care of", and set/reset that |
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// here. But this will do for now, especially in light of the comment |
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// above. Perhaps in the future some lock-free manner of keeping the |
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// coordination. |
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HeapWord* res = ContiguousSpace::par_allocate(size); |
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if (res != NULL) { |
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_offsets.alloc_block(res, size); |
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} |
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return res; |
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} |
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inline HeapWord* |
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OffsetTableContigSpace::block_start_const(const void* p) const { |
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return _offsets.block_start(p); |
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} |
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size_t CompactibleSpace::obj_size(const HeapWord* addr) const { |
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return oop(addr)->size(); |
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} |
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template <class SpaceType> |
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inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* cp) { |
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// Compute the new addresses for the live objects and store it in the mark |
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// Used by universe::mark_sweep_phase2() |
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HeapWord* compact_top; // This is where we are currently compacting to. |
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// We're sure to be here before any objects are compacted into this |
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// space, so this is a good time to initialize this: |
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space->set_compaction_top(space->bottom()); |
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|
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if (cp->space == NULL) { |
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assert(cp->gen != NULL, "need a generation"); |
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assert(cp->threshold == NULL, "just checking"); |
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assert(cp->gen->first_compaction_space() == space, "just checking"); |
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cp->space = cp->gen->first_compaction_space(); |
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compact_top = cp->space->bottom(); |
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cp->space->set_compaction_top(compact_top); |
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cp->threshold = cp->space->initialize_threshold(); |
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} else { |
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compact_top = cp->space->compaction_top(); |
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} |
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// We allow some amount of garbage towards the bottom of the space, so |
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// we don't start compacting before there is a significant gain to be made. |
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// Occasionally, we want to ensure a full compaction, which is determined |
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// by the MarkSweepAlwaysCompactCount parameter. |
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uint invocations = MarkSweep::total_invocations(); |
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bool skip_dead = ((invocations % MarkSweepAlwaysCompactCount) != 0); |
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size_t allowed_deadspace = 0; |
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if (skip_dead) { |
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const size_t ratio = space->allowed_dead_ratio(); |
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allowed_deadspace = (space->capacity() * ratio / 100) / HeapWordSize; |
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} |
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HeapWord* q = space->bottom(); |
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HeapWord* t = space->scan_limit(); |
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HeapWord* end_of_live= q; // One byte beyond the last byte of the last |
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// live object. |
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HeapWord* first_dead = space->end(); // The first dead object. |
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|
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const intx interval = PrefetchScanIntervalInBytes; |
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|
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while (q < t) { |
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assert(!space->scanned_block_is_obj(q) || |
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oop(q)->mark()->is_marked() || oop(q)->mark()->is_unlocked() || |
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oop(q)->mark()->has_bias_pattern(), |
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"these are the only valid states during a mark sweep"); |
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if (space->scanned_block_is_obj(q) && oop(q)->is_gc_marked()) { |
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// prefetch beyond q |
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Prefetch::write(q, interval); |
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size_t size = space->scanned_block_size(q); |
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compact_top = cp->space->forward(oop(q), size, cp, compact_top); |
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q += size; |
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end_of_live = q; |
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} else { |
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// run over all the contiguous dead objects |
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HeapWord* end = q; |
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do { |
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// prefetch beyond end |
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Prefetch::write(end, interval); |
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end += space->scanned_block_size(end); |
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} while (end < t && (!space->scanned_block_is_obj(end) || !oop(end)->is_gc_marked())); |
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// see if we might want to pretend this object is alive so that |
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// we don't have to compact quite as often. |
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if (allowed_deadspace > 0 && q == compact_top) { |
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size_t sz = pointer_delta(end, q); |
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147 |
if (space->insert_deadspace(allowed_deadspace, q, sz)) { |
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148 |
compact_top = cp->space->forward(oop(q), sz, cp, compact_top); |
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149 |
q = end; |
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150 |
end_of_live = end; |
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151 |
continue; |
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152 |
} |
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153 |
} |
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154 |
|
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155 |
// otherwise, it really is a free region. |
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156 |
|
37238 | 157 |
// q is a pointer to a dead object. Use this dead memory to store a pointer to the next live object. |
158 |
(*(HeapWord**)q) = end; |
|
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159 |
|
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160 |
// see if this is the first dead region. |
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161 |
if (q < first_dead) { |
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162 |
first_dead = q; |
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163 |
} |
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164 |
|
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165 |
// move on to the next object |
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166 |
q = end; |
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167 |
} |
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168 |
} |
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169 |
|
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170 |
assert(q == t, "just checking"); |
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171 |
space->_end_of_live = end_of_live; |
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172 |
if (end_of_live < first_dead) { |
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first_dead = end_of_live; |
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174 |
} |
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space->_first_dead = first_dead; |
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176 |
|
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177 |
// save the compaction_top of the compaction space. |
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178 |
cp->space->set_compaction_top(compact_top); |
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179 |
} |
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180 |
|
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181 |
template <class SpaceType> |
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182 |
inline void CompactibleSpace::scan_and_adjust_pointers(SpaceType* space) { |
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183 |
// adjust all the interior pointers to point at the new locations of objects |
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184 |
// Used by MarkSweep::mark_sweep_phase3() |
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185 |
|
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186 |
HeapWord* q = space->bottom(); |
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187 |
HeapWord* t = space->_end_of_live; // Established by "prepare_for_compaction". |
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188 |
|
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189 |
assert(space->_first_dead <= space->_end_of_live, "Stands to reason, no?"); |
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190 |
|
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191 |
if (q < t && space->_first_dead > q && !oop(q)->is_gc_marked()) { |
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192 |
// we have a chunk of the space which hasn't moved and we've |
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193 |
// reinitialized the mark word during the previous pass, so we can't |
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194 |
// use is_gc_marked for the traversal. |
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195 |
HeapWord* end = space->_first_dead; |
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196 |
|
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197 |
while (q < end) { |
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198 |
// I originally tried to conjoin "block_start(q) == q" to the |
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199 |
// assertion below, but that doesn't work, because you can't |
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200 |
// accurately traverse previous objects to get to the current one |
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201 |
// after their pointers have been |
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202 |
// updated, until the actual compaction is done. dld, 4/00 |
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203 |
assert(space->block_is_obj(q), "should be at block boundaries, and should be looking at objs"); |
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204 |
|
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205 |
// point all the oops to the new location |
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206 |
size_t size = MarkSweep::adjust_pointers(oop(q)); |
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207 |
size = space->adjust_obj_size(size); |
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208 |
|
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209 |
q += size; |
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210 |
} |
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211 |
|
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212 |
if (space->_first_dead == t) { |
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213 |
q = t; |
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214 |
} else { |
37238 | 215 |
// The first dead object is no longer an object. At that memory address, |
216 |
// there is a pointer to the first live object that the previous phase found. |
|
217 |
q = *((HeapWord**)(space->_first_dead)); |
|
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218 |
} |
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219 |
} |
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220 |
|
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221 |
const intx interval = PrefetchScanIntervalInBytes; |
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222 |
|
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223 |
debug_only(HeapWord* prev_q = NULL); |
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224 |
while (q < t) { |
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225 |
// prefetch beyond q |
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226 |
Prefetch::write(q, interval); |
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227 |
if (oop(q)->is_gc_marked()) { |
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228 |
// q is alive |
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229 |
// point all the oops to the new location |
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230 |
size_t size = MarkSweep::adjust_pointers(oop(q)); |
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231 |
size = space->adjust_obj_size(size); |
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232 |
debug_only(prev_q = q); |
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233 |
q += size; |
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234 |
} else { |
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235 |
debug_only(prev_q = q); |
37238 | 236 |
// q is not a live object, instead it points at the next live object |
237 |
q = *(HeapWord**)q; |
|
238 |
assert(q > prev_q, "we should be moving forward through memory, q: " PTR_FORMAT ", prev_q: " PTR_FORMAT, p2i(q), p2i(prev_q)); |
|
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239 |
} |
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240 |
} |
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241 |
|
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242 |
assert(q == t, "just checking"); |
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243 |
} |
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244 |
|
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245 |
template <class SpaceType> |
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246 |
inline void CompactibleSpace::scan_and_compact(SpaceType* space) { |
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247 |
// Copy all live objects to their new location |
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248 |
// Used by MarkSweep::mark_sweep_phase4() |
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|
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HeapWord* q = space->bottom(); |
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HeapWord* const t = space->_end_of_live; |
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debug_only(HeapWord* prev_q = NULL); |
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if (q < t && space->_first_dead > q && !oop(q)->is_gc_marked()) { |
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#ifdef ASSERT // Debug only |
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// we have a chunk of the space which hasn't moved and we've reinitialized |
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// the mark word during the previous pass, so we can't use is_gc_marked for |
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// the traversal. |
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HeapWord* const end = space->_first_dead; |
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while (q < end) { |
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size_t size = space->obj_size(q); |
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assert(!oop(q)->is_gc_marked(), "should be unmarked (special dense prefix handling)"); |
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prev_q = q; |
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q += size; |
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} |
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#endif |
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if (space->_first_dead == t) { |
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q = t; |
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} else { |
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// $$$ Funky |
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q = (HeapWord*) oop(space->_first_dead)->mark()->decode_pointer(); |
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} |
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} |
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const intx scan_interval = PrefetchScanIntervalInBytes; |
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const intx copy_interval = PrefetchCopyIntervalInBytes; |
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while (q < t) { |
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if (!oop(q)->is_gc_marked()) { |
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// mark is pointer to next marked oop |
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debug_only(prev_q = q); |
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q = (HeapWord*) oop(q)->mark()->decode_pointer(); |
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assert(q > prev_q, "we should be moving forward through memory"); |
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} else { |
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// prefetch beyond q |
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Prefetch::read(q, scan_interval); |
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|
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// size and destination |
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size_t size = space->obj_size(q); |
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HeapWord* compaction_top = (HeapWord*)oop(q)->forwardee(); |
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|
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// prefetch beyond compaction_top |
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Prefetch::write(compaction_top, copy_interval); |
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|
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// copy object and reinit its mark |
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assert(q != compaction_top, "everything in this pass should be moving"); |
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Copy::aligned_conjoint_words(q, compaction_top, size); |
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oop(compaction_top)->init_mark(); |
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assert(oop(compaction_top)->klass() != NULL, "should have a class"); |
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|
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debug_only(prev_q = q); |
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q += size; |
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} |
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} |
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|
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// Let's remember if we were empty before we did the compaction. |
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bool was_empty = space->used_region().is_empty(); |
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// Reset space after compaction is complete |
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space->reset_after_compaction(); |
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// We do this clear, below, since it has overloaded meanings for some |
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// space subtypes. For example, OffsetTableContigSpace's that were |
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// compacted into will have had their offset table thresholds updated |
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// continuously, but those that weren't need to have their thresholds |
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// re-initialized. Also mangles unused area for debugging. |
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if (space->used_region().is_empty()) { |
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if (!was_empty) space->clear(SpaceDecorator::Mangle); |
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} else { |
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if (ZapUnusedHeapArea) space->mangle_unused_area(); |
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} |
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} |
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|
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size_t ContiguousSpace::scanned_block_size(const HeapWord* addr) const { |
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return oop(addr)->size(); |
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} |
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|
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#endif // SHARE_VM_GC_SHARED_SPACE_INLINE_HPP |