154a1a02bf
Use script and some manual fixup to fix directores names in include guards. Reviewed-by: lfoltan, eosterlund, kbarrett
292 lines
11 KiB
C++
292 lines
11 KiB
C++
/*
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* Copyright (c) 2014, 2019, 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_GC_G1_G1ALLOCATOR_HPP
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#define SHARE_GC_G1_G1ALLOCATOR_HPP
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#include "gc/g1/g1AllocRegion.hpp"
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#include "gc/g1/g1InCSetState.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "gc/shared/plab.hpp"
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class EvacuationInfo;
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// Interface to keep track of which regions G1 is currently allocating into. Provides
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// some accessors (e.g. allocating into them, or getting their occupancy).
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// Also keeps track of retained regions across GCs.
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class G1Allocator : public CHeapObj<mtGC> {
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friend class VMStructs;
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private:
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G1CollectedHeap* _g1h;
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bool _survivor_is_full;
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bool _old_is_full;
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// Alloc region used to satisfy mutator allocation requests.
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MutatorAllocRegion _mutator_alloc_region;
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// Alloc region used to satisfy allocation requests by the GC for
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// survivor objects.
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SurvivorGCAllocRegion _survivor_gc_alloc_region;
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// Alloc region used to satisfy allocation requests by the GC for
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// old objects.
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OldGCAllocRegion _old_gc_alloc_region;
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HeapRegion* _retained_old_gc_alloc_region;
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bool survivor_is_full() const;
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bool old_is_full() const;
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void set_survivor_full();
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void set_old_full();
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void reuse_retained_old_region(EvacuationInfo& evacuation_info,
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OldGCAllocRegion* old,
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HeapRegion** retained);
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// Accessors to the allocation regions.
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inline MutatorAllocRegion* mutator_alloc_region();
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inline SurvivorGCAllocRegion* survivor_gc_alloc_region();
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inline OldGCAllocRegion* old_gc_alloc_region();
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// Allocation attempt during GC for a survivor object / PLAB.
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HeapWord* survivor_attempt_allocation(size_t min_word_size,
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size_t desired_word_size,
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size_t* actual_word_size);
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// Allocation attempt during GC for an old object / PLAB.
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HeapWord* old_attempt_allocation(size_t min_word_size,
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size_t desired_word_size,
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size_t* actual_word_size);
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public:
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G1Allocator(G1CollectedHeap* heap);
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#ifdef ASSERT
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// Do we currently have an active mutator region to allocate into?
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bool has_mutator_alloc_region() { return mutator_alloc_region()->get() != NULL; }
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#endif
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void init_mutator_alloc_region();
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void release_mutator_alloc_region();
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void init_gc_alloc_regions(EvacuationInfo& evacuation_info);
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void release_gc_alloc_regions(EvacuationInfo& evacuation_info);
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void abandon_gc_alloc_regions();
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bool is_retained_old_region(HeapRegion* hr);
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// Allocate blocks of memory during mutator time.
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inline HeapWord* attempt_allocation(size_t min_word_size,
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size_t desired_word_size,
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size_t* actual_word_size);
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inline HeapWord* attempt_allocation_locked(size_t word_size);
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inline HeapWord* attempt_allocation_force(size_t word_size);
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size_t unsafe_max_tlab_alloc();
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size_t used_in_alloc_regions();
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// Allocate blocks of memory during garbage collection. Will ensure an
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// allocation region, either by picking one or expanding the
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// heap, and then allocate a block of the given size. The block
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// may not be a humongous - it must fit into a single heap region.
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HeapWord* par_allocate_during_gc(InCSetState dest,
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size_t word_size);
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HeapWord* par_allocate_during_gc(InCSetState dest,
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size_t min_word_size,
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size_t desired_word_size,
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size_t* actual_word_size);
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};
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// Manages the PLABs used during garbage collection. Interface for allocation from PLABs.
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// Needs to handle multiple contexts, extra alignment in any "survivor" area and some
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// statistics.
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class G1PLABAllocator : public CHeapObj<mtGC> {
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friend class G1ParScanThreadState;
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private:
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G1CollectedHeap* _g1h;
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G1Allocator* _allocator;
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PLAB _surviving_alloc_buffer;
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PLAB _tenured_alloc_buffer;
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PLAB* _alloc_buffers[InCSetState::Num];
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// The survivor alignment in effect in bytes.
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// == 0 : don't align survivors
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// != 0 : align survivors to that alignment
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// These values were chosen to favor the non-alignment case since some
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// architectures have a special compare against zero instructions.
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const uint _survivor_alignment_bytes;
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// Number of words allocated directly (not counting PLAB allocation).
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size_t _direct_allocated[InCSetState::Num];
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void flush_and_retire_stats();
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inline PLAB* alloc_buffer(InCSetState dest);
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// Calculate the survivor space object alignment in bytes. Returns that or 0 if
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// there are no restrictions on survivor alignment.
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static uint calc_survivor_alignment_bytes();
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bool may_throw_away_buffer(size_t const allocation_word_sz, size_t const buffer_size) const;
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public:
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G1PLABAllocator(G1Allocator* allocator);
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void waste(size_t& wasted, size_t& undo_wasted);
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// Allocate word_sz words in dest, either directly into the regions or by
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// allocating a new PLAB. Returns the address of the allocated memory, NULL if
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// not successful. Plab_refill_failed indicates whether an attempt to refill the
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// PLAB failed or not.
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HeapWord* allocate_direct_or_new_plab(InCSetState dest,
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size_t word_sz,
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bool* plab_refill_failed);
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// Allocate word_sz words in the PLAB of dest. Returns the address of the
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// allocated memory, NULL if not successful.
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inline HeapWord* plab_allocate(InCSetState dest,
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size_t word_sz);
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inline HeapWord* allocate(InCSetState dest,
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size_t word_sz,
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bool* refill_failed);
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void undo_allocation(InCSetState dest, HeapWord* obj, size_t word_sz);
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};
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// G1ArchiveRegionMap is a boolean array used to mark G1 regions as
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// archive regions. This allows a quick check for whether an object
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// should not be marked because it is in an archive region.
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class G1ArchiveRegionMap : public G1BiasedMappedArray<bool> {
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protected:
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bool default_value() const { return false; }
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};
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// G1ArchiveAllocator is used to allocate memory in archive
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// regions. Such regions are not scavenged nor compacted by GC.
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// There are two types of archive regions, which are
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// differ in the kind of references allowed for the contained objects:
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//
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// - 'Closed' archive region contain no references outside of other
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// closed archive regions. The region is immutable by GC. GC does
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// not mark object header in 'closed' archive region.
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// - An 'open' archive region allow references to any other regions,
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// including closed archive, open archive and other java heap regions.
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// GC can adjust pointers and mark object header in 'open' archive region.
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class G1ArchiveAllocator : public CHeapObj<mtGC> {
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protected:
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bool _open; // Indicate if the region is 'open' archive.
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G1CollectedHeap* _g1h;
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// The current allocation region
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HeapRegion* _allocation_region;
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// Regions allocated for the current archive range.
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GrowableArray<HeapRegion*> _allocated_regions;
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// The number of bytes used in the current range.
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size_t _summary_bytes_used;
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// Current allocation window within the current region.
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HeapWord* _bottom;
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HeapWord* _top;
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HeapWord* _max;
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// Allocate a new region for this archive allocator.
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// Allocation is from the top of the reserved heap downward.
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bool alloc_new_region();
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public:
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G1ArchiveAllocator(G1CollectedHeap* g1h, bool open) :
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_open(open),
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_g1h(g1h),
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_allocation_region(NULL),
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_allocated_regions((ResourceObj::set_allocation_type((address) &_allocated_regions,
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ResourceObj::C_HEAP),
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2), true /* C_Heap */),
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_summary_bytes_used(0),
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_bottom(NULL),
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_top(NULL),
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_max(NULL) { }
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virtual ~G1ArchiveAllocator() {
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assert(_allocation_region == NULL, "_allocation_region not NULL");
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}
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static G1ArchiveAllocator* create_allocator(G1CollectedHeap* g1h, bool open);
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// Allocate memory for an individual object.
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HeapWord* archive_mem_allocate(size_t word_size);
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// Return the memory ranges used in the current archive, after
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// aligning to the requested alignment.
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void complete_archive(GrowableArray<MemRegion>* ranges,
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size_t end_alignment_in_bytes);
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// The number of bytes allocated by this allocator.
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size_t used() {
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return _summary_bytes_used;
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}
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// Clear the count of bytes allocated in prior G1 regions. This
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// must be done when recalculate_use is used to reset the counter
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// for the generic allocator, since it counts bytes in all G1
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// regions, including those still associated with this allocator.
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void clear_used() {
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_summary_bytes_used = 0;
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}
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// Create the _archive_region_map which is used to identify archive objects.
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static inline void enable_archive_object_check();
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// Mark regions containing the specified address range as archive/non-archive.
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static inline void set_range_archive(MemRegion range, bool open);
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static inline void clear_range_archive(MemRegion range, bool open);
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// Check if the object is in closed archive
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static inline bool is_closed_archive_object(oop object);
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// Check if the object is in open archive
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static inline bool is_open_archive_object(oop object);
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// Check if the object is either in closed archive or open archive
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static inline bool is_archived_object(oop object);
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private:
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static bool _archive_check_enabled;
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static G1ArchiveRegionMap _closed_archive_region_map;
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static G1ArchiveRegionMap _open_archive_region_map;
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// Check if an object is in a closed archive region using the _closed_archive_region_map.
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static inline bool in_closed_archive_range(oop object);
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// Check if an object is in open archive region using the _open_archive_region_map.
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static inline bool in_open_archive_range(oop object);
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// Check if archive object checking is enabled, to avoid calling in_open/closed_archive_range
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// unnecessarily.
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static inline bool archive_check_enabled();
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};
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#endif // SHARE_GC_G1_G1ALLOCATOR_HPP
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