author | johnc |
Mon, 06 Aug 2012 12:20:14 -0700 | |
changeset 13466 | 9fdf353d5f4c |
parent 13195 | hotspot/src/share/vm/gc_implementation/parNew/parGCAllocBuffer.hpp@be27e1b6a4b9 |
child 13758 | 692e37683d34 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2012, 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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#ifndef SHARE_VM_GC_IMPLEMENTATION_PARNEW_PARGCALLOCBUFFER_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_PARNEW_PARGCALLOCBUFFER_HPP |
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#include "memory/allocation.hpp" |
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#include "memory/blockOffsetTable.hpp" |
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#include "memory/threadLocalAllocBuffer.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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// Forward decl. |
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class PLABStats; |
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// A per-thread allocation buffer used during GC. |
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class ParGCAllocBuffer: public CHeapObj<mtGC> { |
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protected: |
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char head[32]; |
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size_t _word_sz; // in HeapWord units |
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HeapWord* _bottom; |
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HeapWord* _top; |
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HeapWord* _end; // last allocatable address + 1 |
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HeapWord* _hard_end; // _end + AlignmentReserve |
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bool _retained; // whether we hold a _retained_filler |
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MemRegion _retained_filler; |
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// In support of ergonomic sizing of PLAB's |
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size_t _allocated; // in HeapWord units |
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size_t _wasted; // in HeapWord units |
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char tail[32]; |
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static size_t FillerHeaderSize; |
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static size_t AlignmentReserve; |
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public: |
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// Initializes the buffer to be empty, but with the given "word_sz". |
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// Must get initialized with "set_buf" for an allocation to succeed. |
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ParGCAllocBuffer(size_t word_sz); |
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static const size_t min_size() { |
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return ThreadLocalAllocBuffer::min_size(); |
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} |
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static const size_t max_size() { |
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return ThreadLocalAllocBuffer::max_size(); |
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} |
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// If an allocation of the given "word_sz" can be satisfied within the |
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// buffer, do the allocation, returning a pointer to the start of the |
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// allocated block. If the allocation request cannot be satisfied, |
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// return NULL. |
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HeapWord* allocate(size_t word_sz) { |
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HeapWord* res = _top; |
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if (pointer_delta(_end, _top) >= word_sz) { |
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_top = _top + word_sz; |
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return res; |
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} else { |
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return NULL; |
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} |
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} |
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// Undo the last allocation in the buffer, which is required to be of the |
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// "obj" of the given "word_sz". |
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void undo_allocation(HeapWord* obj, size_t word_sz) { |
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assert(pointer_delta(_top, _bottom) >= word_sz, "Bad undo"); |
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assert(pointer_delta(_top, obj) == word_sz, "Bad undo"); |
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_top = obj; |
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} |
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// The total (word) size of the buffer, including both allocated and |
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// unallocted space. |
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size_t word_sz() { return _word_sz; } |
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// Should only be done if we are about to reset with a new buffer of the |
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// given size. |
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void set_word_size(size_t new_word_sz) { |
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assert(new_word_sz > AlignmentReserve, "Too small"); |
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_word_sz = new_word_sz; |
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} |
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// The number of words of unallocated space remaining in the buffer. |
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size_t words_remaining() { |
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assert(_end >= _top, "Negative buffer"); |
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return pointer_delta(_end, _top, HeapWordSize); |
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} |
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bool contains(void* addr) { |
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return (void*)_bottom <= addr && addr < (void*)_hard_end; |
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} |
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// Sets the space of the buffer to be [buf, space+word_sz()). |
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void set_buf(HeapWord* buf) { |
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_bottom = buf; |
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_top = _bottom; |
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_hard_end = _bottom + word_sz(); |
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_end = _hard_end - AlignmentReserve; |
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assert(_end >= _top, "Negative buffer"); |
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// In support of ergonomic sizing |
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_allocated += word_sz(); |
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} |
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// Flush the stats supporting ergonomic sizing of PLAB's |
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void flush_stats(PLABStats* stats); |
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void flush_stats_and_retire(PLABStats* stats, bool end_of_gc, bool retain) { |
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// We flush the stats first in order to get a reading of |
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// unused space in the last buffer. |
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if (ResizePLAB) { |
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flush_stats(stats); |
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} |
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// Retire the last allocation buffer. |
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retire(end_of_gc, retain); |
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} |
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// Force future allocations to fail and queries for contains() |
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// to return false |
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void invalidate() { |
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assert(!_retained, "Shouldn't retain an invalidated buffer."); |
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_end = _hard_end; |
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_wasted += pointer_delta(_end, _top); // unused space |
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_top = _end; // force future allocations to fail |
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_bottom = _end; // force future contains() queries to return false |
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} |
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// Fills in the unallocated portion of the buffer with a garbage object. |
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// If "end_of_gc" is TRUE, is after the last use in the GC. IF "retain" |
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// is true, attempt to re-use the unused portion in the next GC. |
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void retire(bool end_of_gc, bool retain); |
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void print() PRODUCT_RETURN; |
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}; |
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// PLAB stats book-keeping |
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class PLABStats VALUE_OBJ_CLASS_SPEC { |
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size_t _allocated; // total allocated |
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size_t _wasted; // of which wasted (internal fragmentation) |
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size_t _unused; // Unused in last buffer |
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size_t _used; // derived = allocated - wasted - unused |
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size_t _desired_plab_sz;// output of filter (below), suitably trimmed and quantized |
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AdaptiveWeightedAverage |
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_filter; // integrator with decay |
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public: |
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PLABStats(size_t desired_plab_sz_, unsigned wt) : |
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_allocated(0), |
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_wasted(0), |
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_unused(0), |
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_used(0), |
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_desired_plab_sz(desired_plab_sz_), |
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_filter(wt) |
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{ |
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size_t min_sz = min_size(); |
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size_t max_sz = max_size(); |
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size_t aligned_min_sz = align_object_size(min_sz); |
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size_t aligned_max_sz = align_object_size(max_sz); |
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assert(min_sz <= aligned_min_sz && max_sz >= aligned_max_sz && |
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min_sz <= max_sz, |
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"PLAB clipping computation in adjust_desired_plab_sz()" |
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" may be incorrect"); |
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} |
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static const size_t min_size() { |
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return ParGCAllocBuffer::min_size(); |
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} |
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static const size_t max_size() { |
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return ParGCAllocBuffer::max_size(); |
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} |
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size_t desired_plab_sz() { |
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return _desired_plab_sz; |
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} |
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void adjust_desired_plab_sz(); // filter computation, latches output to |
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// _desired_plab_sz, clears sensor accumulators |
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void add_allocated(size_t v) { |
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Atomic::add_ptr(v, &_allocated); |
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} |
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void add_unused(size_t v) { |
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Atomic::add_ptr(v, &_unused); |
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} |
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void add_wasted(size_t v) { |
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Atomic::add_ptr(v, &_wasted); |
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} |
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}; |
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class ParGCAllocBufferWithBOT: public ParGCAllocBuffer { |
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BlockOffsetArrayContigSpace _bt; |
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BlockOffsetSharedArray* _bsa; |
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HeapWord* _true_end; // end of the whole ParGCAllocBuffer |
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static const size_t ChunkSizeInWords; |
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static const size_t ChunkSizeInBytes; |
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HeapWord* allocate_slow(size_t word_sz); |
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void fill_region_with_block(MemRegion mr, bool contig); |
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public: |
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ParGCAllocBufferWithBOT(size_t word_sz, BlockOffsetSharedArray* bsa); |
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HeapWord* allocate(size_t word_sz) { |
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HeapWord* res = ParGCAllocBuffer::allocate(word_sz); |
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if (res != NULL) { |
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_bt.alloc_block(res, word_sz); |
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} else { |
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res = allocate_slow(word_sz); |
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} |
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return res; |
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} |
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void undo_allocation(HeapWord* obj, size_t word_sz); |
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void set_buf(HeapWord* buf_start) { |
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ParGCAllocBuffer::set_buf(buf_start); |
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_true_end = _hard_end; |
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_bt.set_region(MemRegion(buf_start, word_sz())); |
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_bt.initialize_threshold(); |
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} |
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void retire(bool end_of_gc, bool retain); |
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MemRegion range() { |
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return MemRegion(_top, _true_end); |
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} |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_PARGCALLOCBUFFER_HPP |