author | stuefe |
Thu, 12 Sep 2019 12:51:31 +0200 | |
changeset 58105 | efcda145fb2c |
parent 50429 | 83aec1d357d4 |
child 58159 | 892527a70da9 |
permissions | -rw-r--r-- |
50113 | 1 |
/* |
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* Copyright (c) 2017, 2018, 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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#include "precompiled.hpp" |
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#include "jfr/recorder/storage/jfrVirtualMemory.hpp" |
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#include "memory/virtualspace.hpp" |
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58105
efcda145fb2c
8230888: jfrVirtualMemory.cpp should include globals.hpp
stuefe
parents:
50429
diff
changeset
|
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#include "runtime/globals.hpp" |
50429
83aec1d357d4
8204301: Make OrderAccess functions available to hpp rather than inline.hpp files
coleenp
parents:
50113
diff
changeset
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#include "runtime/orderAccess.hpp" |
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#include "runtime/os.hpp" |
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#include "services/memTracker.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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/* |
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* A memory segment represents a virtual memory reservation. |
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* It provides ways to commit and decommit physical storage |
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* onto its virtual memory reservation. |
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*/ |
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class JfrVirtualMemorySegment : public JfrCHeapObj { |
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friend class JfrVirtualMemoryManager; |
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private: |
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JfrVirtualMemorySegment* _next; |
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char* _top; |
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ReservedSpace _rs; |
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VirtualSpace _virtual_memory; |
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// Convenience functions to access the underlying virtual space metadata |
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const u1* committed_low() const { return (const u1*)_virtual_memory.low(); } |
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const u1* committed_high() const { return (const u1*)_virtual_memory.high(); } |
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const u1* reserved_low() const { return (const u1*)_virtual_memory.low_boundary(); } |
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const u1* reserved_high() const { return (const u1*)_virtual_memory.high_boundary(); } |
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size_t reserved_words() const { return _virtual_memory.reserved_size() / BytesPerWord; } |
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size_t committed_words() const { return _virtual_memory.actual_committed_size() / BytesPerWord; } |
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bool is_pre_committed() const { return _virtual_memory.special(); } |
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VirtualSpace& virtual_space() { return _virtual_memory; } |
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JfrVirtualMemorySegment(); |
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~JfrVirtualMemorySegment(); |
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JfrVirtualMemorySegment* next() const { return _next; } |
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void set_next(JfrVirtualMemorySegment* v) { _next = v; } |
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// Returns true if requested size is available in the committed area |
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bool is_available(size_t block_size_request_words) { |
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return block_size_request_words <= pointer_delta(committed_high(), _top, sizeof(char*)); |
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} |
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// allocation pointer committed memory |
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char* top() const { return _top; } |
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void inc_top(size_t size_in_words) { |
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assert(is_available(size_in_words), "invariant"); |
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_top += size_in_words * BytesPerWord; |
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assert(_top <= _virtual_memory.high(), "invariant"); |
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} |
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// initialization is the virtual memory reservation |
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bool initialize(size_t reservation_size_request_bytes); |
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void* take_from_committed(size_t block_size_request_words); |
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// Returns committed memory |
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void* commit(size_t block_size_request_words) { |
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return take_from_committed(block_size_request_words); |
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} |
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// Commit more memory in a reservation |
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bool expand_by(size_t block_size_request_words); |
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// Decommits all committed memory in this reservation segment. |
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void decommit(); |
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}; |
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JfrVirtualMemorySegment::JfrVirtualMemorySegment() : |
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_next(NULL), |
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_top(NULL), |
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_rs(), |
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_virtual_memory() {} |
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JfrVirtualMemorySegment::~JfrVirtualMemorySegment() { |
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decommit(); |
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_rs.release(); |
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} |
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bool JfrVirtualMemorySegment::initialize(size_t reservation_size_request_bytes) { |
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assert(is_aligned(reservation_size_request_bytes, os::vm_allocation_granularity()), "invariant"); |
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_rs = ReservedSpace(reservation_size_request_bytes, |
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os::vm_allocation_granularity(), |
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UseLargePages && os::can_commit_large_page_memory(), |
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false); |
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if (!_rs.is_reserved()) { |
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return false; |
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} |
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assert(_rs.base() != NULL, "invariant"); |
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assert(_rs.size() != 0, "invariant"); |
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assert(is_aligned(_rs.base(), os::vm_allocation_granularity()), "invariant"); |
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assert(is_aligned(_rs.size(), os::vm_allocation_granularity()), "invariant"); |
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os::trace_page_sizes("Jfr", reservation_size_request_bytes, |
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reservation_size_request_bytes, |
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os::vm_page_size(), |
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_rs.base(), |
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_rs.size()); |
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MemTracker::record_virtual_memory_type((address)_rs.base(), mtTracing); |
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assert(is_aligned(_rs.base(), os::vm_page_size()), "invariant"); |
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assert(is_aligned(_rs.size(), os::vm_page_size()), "invariant"); |
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// ReservedSpaces marked as special will have the entire memory |
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// pre-committed. Setting a committed size will make sure that |
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// committed_size and actual_committed_size agrees. |
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const size_t pre_committed_size = _rs.special() ? _rs.size() : 0; |
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const bool result = virtual_space().initialize_with_granularity(_rs, pre_committed_size, os::vm_page_size()); |
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if (result) { |
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assert(virtual_space().committed_size() == virtual_space().actual_committed_size(), |
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"Checking that the pre-committed memory was registered by the VirtualSpace"); |
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_top = virtual_space().low(); |
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} |
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return result; |
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} |
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bool JfrVirtualMemorySegment::expand_by(size_t block_size_request_words) { |
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size_t block_size_request_bytes = block_size_request_words * BytesPerWord; |
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const size_t uncommitted = virtual_space().reserved_size() - virtual_space().actual_committed_size(); |
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if (uncommitted < block_size_request_bytes) { |
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// commit whatever is left in the reservation |
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block_size_request_bytes = uncommitted; |
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} |
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assert(is_aligned(block_size_request_bytes, os::vm_allocation_granularity()), "invariant"); |
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// commit block in reserved memory |
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bool result = virtual_space().expand_by(block_size_request_bytes, false); |
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assert(result, "Failed to commit memory"); |
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return result; |
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} |
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void JfrVirtualMemorySegment::decommit() { |
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assert(_virtual_memory.committed_size() == _virtual_memory.actual_committed_size(), |
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"The committed memory doesn't match the expanded memory."); |
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const size_t committed_size = virtual_space().actual_committed_size(); |
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if (committed_size > 0) { |
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virtual_space().shrink_by(committed_size); |
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} |
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assert(_virtual_memory.actual_committed_size() == 0, "invariant"); |
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} |
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// Attempt to get a committed block |
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void* JfrVirtualMemorySegment::take_from_committed(size_t block_size_request_words) { |
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// The virtual spaces are always expanded by the |
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// commit granularity to enforce the following condition. |
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// Without this the is_available check will not work correctly. |
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assert(_virtual_memory.committed_size() == _virtual_memory.actual_committed_size(), |
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"The committed memory doesn't match the expanded memory."); |
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if (!is_available(block_size_request_words)) { |
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return NULL; |
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} |
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void* const block = top(); |
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assert(block != NULL, "invariant"); |
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inc_top(block_size_request_words); |
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return block; |
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} |
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class JfrVirtualMemoryManager : public JfrCHeapObj { |
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typedef JfrVirtualMemorySegment Segment; |
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private: |
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Segment* _segments; |
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Segment* _current_segment; |
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size_t _reservation_size_request_words; |
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size_t _reservation_size_request_limit_words; // total reservation limit |
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// Sum of reserved and committed memory in the segments |
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size_t _current_reserved_words; |
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size_t _current_committed_words; |
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void link(Segment* segment); |
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Segment* current(); |
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void inc_reserved_words(size_t words); |
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void inc_committed_words(size_t words); |
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bool new_segment(size_t reservation_size_request_words); |
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bool expand_segment_by(Segment* segment, size_t block_size_request_words); |
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bool expand_by(size_t block_size_request_words, size_t reservation_size_request_words); |
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bool can_reserve() const; |
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public: |
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JfrVirtualMemoryManager(); |
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~JfrVirtualMemoryManager(); |
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bool initialize(size_t reservation_size_request_words, size_t segment_count = 1); |
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void* commit(size_t requested_block_size_words); |
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bool is_full() const { |
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return reserved_high() == committed_high(); |
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} |
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const u1* committed_low() const { return _current_segment->committed_low(); } |
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const u1* committed_high() const { return _current_segment->committed_high(); } |
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const u1* reserved_low() const { return _current_segment->reserved_low(); } |
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const u1* reserved_high() const { return _current_segment->reserved_high(); } |
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}; |
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JfrVirtualMemoryManager::JfrVirtualMemoryManager() : |
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_segments(NULL), |
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_current_segment(NULL), |
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_reservation_size_request_words(0), |
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_reservation_size_request_limit_words(0), |
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_current_reserved_words(0), |
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_current_committed_words(0) {} |
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JfrVirtualMemoryManager::~JfrVirtualMemoryManager() { |
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JfrVirtualMemorySegment* segment = _segments; |
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while (segment != NULL) { |
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JfrVirtualMemorySegment* next_segment = segment->next(); |
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delete segment; |
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segment = next_segment; |
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} |
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} |
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// for now only allow a singleton segment per virtual memory client |
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bool JfrVirtualMemoryManager::initialize(size_t reservation_size_request_words, size_t segment_count /* 1 */) { |
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assert(is_aligned(reservation_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant"); |
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_reservation_size_request_words = reservation_size_request_words; |
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assert(segment_count > 0, "invariant"); |
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_reservation_size_request_limit_words = reservation_size_request_words * segment_count; |
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assert(is_aligned(_reservation_size_request_limit_words * BytesPerWord, os::vm_allocation_granularity()), "invariant"); |
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return new_segment(_reservation_size_request_words); |
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} |
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bool JfrVirtualMemoryManager::can_reserve() const { |
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return _reservation_size_request_limit_words == 0 ? true : _current_reserved_words < _reservation_size_request_limit_words; |
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} |
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// Allocate another segment and add it to the list. |
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bool JfrVirtualMemoryManager::new_segment(size_t reservation_size_request_words) { |
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assert(reservation_size_request_words > 0, "invariant"); |
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assert(is_aligned(reservation_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant"); |
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Segment* segment = new Segment(); |
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if (NULL == segment) { |
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return false; |
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} |
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if (!segment->initialize(reservation_size_request_words * BytesPerWord)) { |
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delete segment; |
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return false; |
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} |
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assert(segment->reserved_words() == reservation_size_request_words, |
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"Actual reserved memory size differs from requested reservation memory size"); |
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link(segment); |
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return true; |
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} |
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bool JfrVirtualMemoryManager::expand_segment_by(JfrVirtualMemorySegment* segment, size_t block_size_request_words) { |
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assert(segment != NULL, "invariant"); |
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const size_t before = segment->committed_words(); |
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276 |
const bool result = segment->expand_by(block_size_request_words); |
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277 |
const size_t after = segment->committed_words(); |
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// after and before can be the same if the memory was pre-committed. |
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assert(after >= before, "Inconsistency"); |
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inc_committed_words(after - before); |
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return result; |
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} |
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283 |
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284 |
void JfrVirtualMemoryManager::inc_reserved_words(size_t words) { |
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_current_reserved_words += words; |
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} |
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287 |
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288 |
JfrVirtualMemorySegment* JfrVirtualMemoryManager::current() { |
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289 |
return _current_segment; |
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290 |
} |
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291 |
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292 |
void JfrVirtualMemoryManager::inc_committed_words(size_t words) { |
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293 |
_current_committed_words += words; |
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294 |
} |
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295 |
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296 |
bool JfrVirtualMemoryManager::expand_by(size_t block_size_request_words, size_t reservation_size_request_words) { |
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297 |
assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_page_size()), "invariant"); |
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298 |
assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant"); |
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299 |
assert(is_aligned(reservation_size_request_words * BytesPerWord, os::vm_page_size()), "invariant"); |
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300 |
assert(is_aligned(reservation_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant"); |
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301 |
assert(block_size_request_words <= reservation_size_request_words, "invariant"); |
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// Attempt to commit more memory from the the current virtual space reservation. |
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303 |
if (expand_segment_by(current(), block_size_request_words)) { |
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return true; |
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305 |
} |
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306 |
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307 |
// reached limit of what is allowed to be reserved? |
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308 |
if (!can_reserve()) { |
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309 |
return false; |
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310 |
} |
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311 |
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312 |
// Get another segment. |
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313 |
if (!new_segment(reservation_size_request_words)) { |
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314 |
return false; |
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315 |
} |
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316 |
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317 |
if (current()->is_pre_committed()) { |
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318 |
// The memory was pre-committed, so we are done here. |
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319 |
assert(block_size_request_words <= current()->committed_words(), |
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320 |
"The new VirtualSpace was pre-committed, so it" |
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321 |
"should be large enough to fit the alloc request."); |
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322 |
return true; |
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323 |
} |
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324 |
return expand_segment_by(current(), block_size_request_words); |
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325 |
} |
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326 |
||
327 |
void JfrVirtualMemoryManager::link(JfrVirtualMemorySegment* segment) { |
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328 |
assert(segment != NULL, "invariant"); |
|
329 |
if (_segments == NULL) { |
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330 |
_segments = segment; |
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331 |
} else { |
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332 |
assert(_current_segment != NULL, "invariant"); |
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333 |
assert(_segments == _current_segment, "invariant"); |
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334 |
_current_segment->set_next(segment); |
|
335 |
} |
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336 |
_current_segment = segment; |
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337 |
inc_reserved_words(segment->reserved_words()); |
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338 |
inc_committed_words(segment->committed_words()); |
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339 |
} |
|
340 |
||
341 |
void* JfrVirtualMemoryManager::commit(size_t block_size_request_words) { |
|
342 |
assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant"); |
|
343 |
void* block = current()->commit(block_size_request_words); |
|
344 |
if (block != NULL) { |
|
345 |
return block; |
|
346 |
} |
|
347 |
assert(block == NULL, "invariant"); |
|
348 |
if (is_full()) { |
|
349 |
return NULL; |
|
350 |
} |
|
351 |
assert(block_size_request_words <= _reservation_size_request_words, "invariant"); |
|
352 |
if (expand_by(block_size_request_words, _reservation_size_request_words)) { |
|
353 |
block = current()->commit(block_size_request_words); |
|
354 |
assert(block != NULL, "The allocation was expected to succeed after the expansion"); |
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355 |
} |
|
356 |
return block; |
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357 |
} |
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358 |
||
359 |
JfrVirtualMemory::JfrVirtualMemory() : |
|
360 |
_vmm(NULL), |
|
361 |
_reserved_low(), |
|
362 |
_reserved_high(), |
|
363 |
_top(NULL), |
|
364 |
_commit_point(NULL), |
|
365 |
_physical_commit_size_request_words(0), |
|
366 |
_aligned_datum_size_bytes(0) {} |
|
367 |
||
368 |
JfrVirtualMemory::~JfrVirtualMemory() { |
|
369 |
assert(_vmm != NULL, "invariant"); |
|
370 |
delete _vmm; |
|
371 |
} |
|
372 |
||
373 |
size_t JfrVirtualMemory::aligned_datum_size_bytes() const { |
|
374 |
return _aligned_datum_size_bytes; |
|
375 |
} |
|
376 |
||
377 |
static void adjust_allocation_ratio(size_t* const reservation_size_bytes, size_t* const commit_size_bytes) { |
|
378 |
assert(reservation_size_bytes != NULL, "invariant"); |
|
379 |
assert(*reservation_size_bytes > 0, "invariant"); |
|
380 |
assert(commit_size_bytes != NULL, "invariant"); |
|
381 |
assert(*commit_size_bytes > 0, "invariant"); |
|
382 |
assert(*reservation_size_bytes >= *commit_size_bytes, "invariant"); |
|
383 |
assert(is_aligned(*reservation_size_bytes, os::vm_allocation_granularity()), "invariant"); |
|
384 |
assert(is_aligned(*commit_size_bytes, os::vm_allocation_granularity()), "invariant"); |
|
385 |
||
386 |
size_t reservation_size_units = *reservation_size_bytes / os::vm_allocation_granularity(); |
|
387 |
size_t commit_size_units = *commit_size_bytes / os::vm_allocation_granularity(); |
|
388 |
assert(reservation_size_units > 0, "invariant"); |
|
389 |
assert(commit_size_units > 0, "invariant"); |
|
390 |
||
391 |
size_t original_ratio_units = reservation_size_units / commit_size_units; |
|
392 |
size_t rem = reservation_size_units % commit_size_units; |
|
393 |
assert(original_ratio_units > 0, "invariant"); |
|
394 |
||
395 |
if (rem > 0) { |
|
396 |
reservation_size_units -= rem % original_ratio_units; |
|
397 |
commit_size_units += rem / original_ratio_units; |
|
398 |
} |
|
399 |
||
400 |
assert(commit_size_units > 0, "invariant"); |
|
401 |
assert(reservation_size_units % original_ratio_units == 0, "invariant"); |
|
402 |
assert(original_ratio_units * commit_size_units == reservation_size_units , "invariant"); |
|
403 |
assert(original_ratio_units == reservation_size_units / commit_size_units, "invariant"); |
|
404 |
*reservation_size_bytes = reservation_size_units * os::vm_allocation_granularity(); |
|
405 |
*commit_size_bytes = commit_size_units * os::vm_allocation_granularity(); |
|
406 |
assert((*reservation_size_bytes % *commit_size_bytes) == 0, "invariant"); |
|
407 |
} |
|
408 |
||
409 |
||
410 |
void* JfrVirtualMemory::initialize(size_t reservation_size_request_bytes, |
|
411 |
size_t block_size_request_bytes, |
|
412 |
size_t datum_size_bytes /* 1 */) { |
|
413 |
assert(_vmm == NULL, "invariant"); |
|
414 |
_vmm = new JfrVirtualMemoryManager(); |
|
415 |
||
416 |
if (_vmm == NULL) { |
|
417 |
return NULL; |
|
418 |
} |
|
419 |
||
420 |
assert(reservation_size_request_bytes > 0, "invariant"); |
|
421 |
_aligned_datum_size_bytes = align_up(datum_size_bytes, BytesPerWord); |
|
422 |
assert(is_aligned(_aligned_datum_size_bytes, BytesPerWord), "invariant"); |
|
423 |
||
424 |
reservation_size_request_bytes = ReservedSpace::allocation_align_size_up(reservation_size_request_bytes); |
|
425 |
assert(is_aligned(reservation_size_request_bytes, os::vm_allocation_granularity()), "invariant"); |
|
426 |
assert(is_aligned(reservation_size_request_bytes, _aligned_datum_size_bytes), "invariant"); |
|
427 |
block_size_request_bytes = MAX2(block_size_request_bytes, (size_t)os::vm_allocation_granularity()); |
|
428 |
block_size_request_bytes = ReservedSpace::allocation_align_size_up(block_size_request_bytes); |
|
429 |
assert(is_aligned(block_size_request_bytes, os::vm_allocation_granularity()), "invariant"); |
|
430 |
assert(is_aligned(block_size_request_bytes, _aligned_datum_size_bytes), "invariant"); |
|
431 |
// adjustment to valid ratio in units of vm_allocation_granularity |
|
432 |
adjust_allocation_ratio(&reservation_size_request_bytes, &block_size_request_bytes); |
|
433 |
assert(is_aligned(reservation_size_request_bytes, os::vm_allocation_granularity()), "invariant"); |
|
434 |
assert(is_aligned(reservation_size_request_bytes, _aligned_datum_size_bytes), "invariant"); |
|
435 |
assert(is_aligned(block_size_request_bytes, os::vm_allocation_granularity()), "invariant"); |
|
436 |
assert(is_aligned(block_size_request_bytes, _aligned_datum_size_bytes), "invariant"); |
|
437 |
assert((reservation_size_request_bytes % block_size_request_bytes) == 0, "invariant"); |
|
438 |
const size_t reservation_size_request_words = reservation_size_request_bytes / BytesPerWord; |
|
439 |
_physical_commit_size_request_words = block_size_request_bytes / BytesPerWord; |
|
440 |
// virtual memory reservation |
|
441 |
if (!_vmm->initialize(reservation_size_request_words)) { |
|
442 |
// is implicitly "full" if reservation fails |
|
443 |
assert(is_full(), "invariant"); |
|
444 |
return NULL; |
|
445 |
} |
|
446 |
_reserved_low = (const u1*)_vmm->reserved_low(); |
|
447 |
_reserved_high = (const u1*)_vmm->reserved_high(); |
|
448 |
// reservation complete |
|
449 |
_top = (u1*)_vmm->committed_high(); |
|
450 |
_commit_point = _top; |
|
451 |
assert(_reserved_low == _top, "invariant"); // initial empty state |
|
452 |
assert((size_t)(_reserved_high - _reserved_low) == reservation_size_request_bytes, "invariant"); |
|
453 |
// initial commit |
|
454 |
commit_memory_block(); |
|
455 |
return _top; |
|
456 |
} |
|
457 |
||
458 |
void* JfrVirtualMemory::commit(size_t block_size_request_words) { |
|
459 |
assert(_vmm != NULL, "invariant"); |
|
460 |
assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant"); |
|
461 |
return _vmm->commit(block_size_request_words); |
|
462 |
} |
|
463 |
||
464 |
bool JfrVirtualMemory::is_full() const { |
|
465 |
return _top == _reserved_high; |
|
466 |
} |
|
467 |
||
468 |
bool JfrVirtualMemory::is_empty() const { |
|
469 |
return _top == _reserved_low; |
|
470 |
} |
|
471 |
||
472 |
bool JfrVirtualMemory::commit_memory_block() { |
|
473 |
assert(_vmm != NULL, "invariant"); |
|
474 |
assert(!is_full(), "invariant"); |
|
475 |
assert(_top == _commit_point, "invariant"); |
|
476 |
||
477 |
void* const block = _vmm->commit(_physical_commit_size_request_words); |
|
478 |
if (block != NULL) { |
|
479 |
_commit_point = _vmm->committed_high(); |
|
480 |
return true; |
|
481 |
} |
|
482 |
// all reserved virtual memory is committed |
|
483 |
assert(block == NULL, "invariant"); |
|
484 |
assert(_vmm->reserved_high() == _vmm->committed_high(), "invariant"); |
|
485 |
return false; |
|
486 |
} |
|
487 |
||
488 |
void* JfrVirtualMemory::new_datum() { |
|
489 |
assert(_vmm != NULL, "invariant"); |
|
490 |
assert(!is_full(), "invariant"); |
|
491 |
if (_top == _commit_point) { |
|
492 |
if (!commit_memory_block()) { |
|
493 |
assert(is_full(), "invariant"); |
|
494 |
return NULL; |
|
495 |
} |
|
496 |
} |
|
497 |
assert(_top + _aligned_datum_size_bytes <= _commit_point, "invariant"); |
|
498 |
u1* allocation = _top; |
|
499 |
_top += _aligned_datum_size_bytes; |
|
500 |
assert(is_aligned(allocation, _aligned_datum_size_bytes), "invariant"); |
|
501 |
return allocation; |
|
502 |
} |
|
503 |
||
504 |
void* JfrVirtualMemory::index_ptr(size_t index) { |
|
505 |
assert((index * _aligned_datum_size_bytes) + _reserved_low < _commit_point, "invariant"); |
|
506 |
return (void*)((index * _aligned_datum_size_bytes) + _reserved_low); |
|
507 |
} |
|
508 |
||
509 |
void* JfrVirtualMemory::get(size_t index) { |
|
510 |
return index_ptr(index); |
|
511 |
} |
|
512 |
||
513 |
size_t JfrVirtualMemory::count() const { |
|
514 |
return (_top - _reserved_low) / _aligned_datum_size_bytes; |
|
515 |
} |
|
516 |
||
517 |
size_t JfrVirtualMemory::live_set() const { |
|
518 |
return _top - _reserved_low; |
|
519 |
} |
|
520 |
||
521 |
size_t JfrVirtualMemory::reserved_size() const { |
|
522 |
return _reserved_high - _reserved_low; |
|
523 |
} |
|
524 |
||
525 |
bool JfrVirtualMemory::compact(size_t index) { |
|
526 |
assert(index > 0, "invariant"); |
|
527 |
assert(index <= reserved_size(), "invariant"); |
|
528 |
const u1* low = static_cast<u1*>(index_ptr(index)); |
|
529 |
const size_t block_size = _top - low; |
|
530 |
memcpy(const_cast<u1*>(_reserved_low), low, block_size); |
|
531 |
_top = const_cast<u1*>(_reserved_low) + block_size; |
|
532 |
assert(live_set() == block_size, "invariant"); |
|
533 |
return true; |
|
534 |
} |