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/*
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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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#include "runtime/orderAccess.inline.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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const bool result = segment->expand_by(block_size_request_words);
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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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void JfrVirtualMemoryManager::inc_reserved_words(size_t words) {
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_current_reserved_words += words;
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}
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JfrVirtualMemorySegment* JfrVirtualMemoryManager::current() {
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return _current_segment;
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}
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void JfrVirtualMemoryManager::inc_committed_words(size_t words) {
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_current_committed_words += words;
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}
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bool JfrVirtualMemoryManager::expand_by(size_t block_size_request_words, size_t reservation_size_request_words) {
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assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_page_size()), "invariant");
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assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant");
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assert(is_aligned(reservation_size_request_words * BytesPerWord, os::vm_page_size()), "invariant");
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assert(is_aligned(reservation_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant");
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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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if (expand_segment_by(current(), block_size_request_words)) {
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return true;
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}
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// reached limit of what is allowed to be reserved?
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if (!can_reserve()) {
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return false;
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}
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// Get another segment.
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if (!new_segment(reservation_size_request_words)) {
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return false;
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}
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if (current()->is_pre_committed()) {
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// The memory was pre-committed, so we are done here.
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assert(block_size_request_words <= current()->committed_words(),
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"The new VirtualSpace was pre-committed, so it"
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"should be large enough to fit the alloc request.");
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return true;
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}
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return expand_segment_by(current(), block_size_request_words);
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}
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void JfrVirtualMemoryManager::link(JfrVirtualMemorySegment* segment) {
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assert(segment != NULL, "invariant");
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if (_segments == NULL) {
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_segments = segment;
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} else {
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assert(_current_segment != NULL, "invariant");
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assert(_segments == _current_segment, "invariant");
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_current_segment->set_next(segment);
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}
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_current_segment = segment;
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inc_reserved_words(segment->reserved_words());
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inc_committed_words(segment->committed_words());
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}
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void* JfrVirtualMemoryManager::commit(size_t block_size_request_words) {
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assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant");
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void* block = current()->commit(block_size_request_words);
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if (block != NULL) {
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return block;
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}
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assert(block == NULL, "invariant");
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if (is_full()) {
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return NULL;
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}
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assert(block_size_request_words <= _reservation_size_request_words, "invariant");
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if (expand_by(block_size_request_words, _reservation_size_request_words)) {
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block = current()->commit(block_size_request_words);
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assert(block != NULL, "The allocation was expected to succeed after the expansion");
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}
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return block;
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}
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JfrVirtualMemory::JfrVirtualMemory() :
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_vmm(NULL),
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_reserved_low(),
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_reserved_high(),
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_top(NULL),
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_commit_point(NULL),
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_physical_commit_size_request_words(0),
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_aligned_datum_size_bytes(0) {}
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JfrVirtualMemory::~JfrVirtualMemory() {
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assert(_vmm != NULL, "invariant");
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delete _vmm;
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}
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size_t JfrVirtualMemory::aligned_datum_size_bytes() const {
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return _aligned_datum_size_bytes;
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}
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static void adjust_allocation_ratio(size_t* const reservation_size_bytes, size_t* const commit_size_bytes) {
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377 |
assert(reservation_size_bytes != NULL, "invariant");
|
|
378 |
assert(*reservation_size_bytes > 0, "invariant");
|
|
379 |
assert(commit_size_bytes != NULL, "invariant");
|
|
380 |
assert(*commit_size_bytes > 0, "invariant");
|
|
381 |
assert(*reservation_size_bytes >= *commit_size_bytes, "invariant");
|
|
382 |
assert(is_aligned(*reservation_size_bytes, os::vm_allocation_granularity()), "invariant");
|
|
383 |
assert(is_aligned(*commit_size_bytes, os::vm_allocation_granularity()), "invariant");
|
|
384 |
|
|
385 |
size_t reservation_size_units = *reservation_size_bytes / os::vm_allocation_granularity();
|
|
386 |
size_t commit_size_units = *commit_size_bytes / os::vm_allocation_granularity();
|
|
387 |
assert(reservation_size_units > 0, "invariant");
|
|
388 |
assert(commit_size_units > 0, "invariant");
|
|
389 |
|
|
390 |
size_t original_ratio_units = reservation_size_units / commit_size_units;
|
|
391 |
size_t rem = reservation_size_units % commit_size_units;
|
|
392 |
assert(original_ratio_units > 0, "invariant");
|
|
393 |
|
|
394 |
if (rem > 0) {
|
|
395 |
reservation_size_units -= rem % original_ratio_units;
|
|
396 |
commit_size_units += rem / original_ratio_units;
|
|
397 |
}
|
|
398 |
|
|
399 |
assert(commit_size_units > 0, "invariant");
|
|
400 |
assert(reservation_size_units % original_ratio_units == 0, "invariant");
|
|
401 |
assert(original_ratio_units * commit_size_units == reservation_size_units , "invariant");
|
|
402 |
assert(original_ratio_units == reservation_size_units / commit_size_units, "invariant");
|
|
403 |
*reservation_size_bytes = reservation_size_units * os::vm_allocation_granularity();
|
|
404 |
*commit_size_bytes = commit_size_units * os::vm_allocation_granularity();
|
|
405 |
assert((*reservation_size_bytes % *commit_size_bytes) == 0, "invariant");
|
|
406 |
}
|
|
407 |
|
|
408 |
|
|
409 |
void* JfrVirtualMemory::initialize(size_t reservation_size_request_bytes,
|
|
410 |
size_t block_size_request_bytes,
|
|
411 |
size_t datum_size_bytes /* 1 */) {
|
|
412 |
assert(_vmm == NULL, "invariant");
|
|
413 |
_vmm = new JfrVirtualMemoryManager();
|
|
414 |
|
|
415 |
if (_vmm == NULL) {
|
|
416 |
return NULL;
|
|
417 |
}
|
|
418 |
|
|
419 |
assert(reservation_size_request_bytes > 0, "invariant");
|
|
420 |
_aligned_datum_size_bytes = align_up(datum_size_bytes, BytesPerWord);
|
|
421 |
assert(is_aligned(_aligned_datum_size_bytes, BytesPerWord), "invariant");
|
|
422 |
|
|
423 |
reservation_size_request_bytes = ReservedSpace::allocation_align_size_up(reservation_size_request_bytes);
|
|
424 |
assert(is_aligned(reservation_size_request_bytes, os::vm_allocation_granularity()), "invariant");
|
|
425 |
assert(is_aligned(reservation_size_request_bytes, _aligned_datum_size_bytes), "invariant");
|
|
426 |
block_size_request_bytes = MAX2(block_size_request_bytes, (size_t)os::vm_allocation_granularity());
|
|
427 |
block_size_request_bytes = ReservedSpace::allocation_align_size_up(block_size_request_bytes);
|
|
428 |
assert(is_aligned(block_size_request_bytes, os::vm_allocation_granularity()), "invariant");
|
|
429 |
assert(is_aligned(block_size_request_bytes, _aligned_datum_size_bytes), "invariant");
|
|
430 |
// adjustment to valid ratio in units of vm_allocation_granularity
|
|
431 |
adjust_allocation_ratio(&reservation_size_request_bytes, &block_size_request_bytes);
|
|
432 |
assert(is_aligned(reservation_size_request_bytes, os::vm_allocation_granularity()), "invariant");
|
|
433 |
assert(is_aligned(reservation_size_request_bytes, _aligned_datum_size_bytes), "invariant");
|
|
434 |
assert(is_aligned(block_size_request_bytes, os::vm_allocation_granularity()), "invariant");
|
|
435 |
assert(is_aligned(block_size_request_bytes, _aligned_datum_size_bytes), "invariant");
|
|
436 |
assert((reservation_size_request_bytes % block_size_request_bytes) == 0, "invariant");
|
|
437 |
const size_t reservation_size_request_words = reservation_size_request_bytes / BytesPerWord;
|
|
438 |
_physical_commit_size_request_words = block_size_request_bytes / BytesPerWord;
|
|
439 |
// virtual memory reservation
|
|
440 |
if (!_vmm->initialize(reservation_size_request_words)) {
|
|
441 |
// is implicitly "full" if reservation fails
|
|
442 |
assert(is_full(), "invariant");
|
|
443 |
return NULL;
|
|
444 |
}
|
|
445 |
_reserved_low = (const u1*)_vmm->reserved_low();
|
|
446 |
_reserved_high = (const u1*)_vmm->reserved_high();
|
|
447 |
// reservation complete
|
|
448 |
_top = (u1*)_vmm->committed_high();
|
|
449 |
_commit_point = _top;
|
|
450 |
assert(_reserved_low == _top, "invariant"); // initial empty state
|
|
451 |
assert((size_t)(_reserved_high - _reserved_low) == reservation_size_request_bytes, "invariant");
|
|
452 |
// initial commit
|
|
453 |
commit_memory_block();
|
|
454 |
return _top;
|
|
455 |
}
|
|
456 |
|
|
457 |
void* JfrVirtualMemory::commit(size_t block_size_request_words) {
|
|
458 |
assert(_vmm != NULL, "invariant");
|
|
459 |
assert(is_aligned(block_size_request_words * BytesPerWord, os::vm_allocation_granularity()), "invariant");
|
|
460 |
return _vmm->commit(block_size_request_words);
|
|
461 |
}
|
|
462 |
|
|
463 |
bool JfrVirtualMemory::is_full() const {
|
|
464 |
return _top == _reserved_high;
|
|
465 |
}
|
|
466 |
|
|
467 |
bool JfrVirtualMemory::is_empty() const {
|
|
468 |
return _top == _reserved_low;
|
|
469 |
}
|
|
470 |
|
|
471 |
bool JfrVirtualMemory::commit_memory_block() {
|
|
472 |
assert(_vmm != NULL, "invariant");
|
|
473 |
assert(!is_full(), "invariant");
|
|
474 |
assert(_top == _commit_point, "invariant");
|
|
475 |
|
|
476 |
void* const block = _vmm->commit(_physical_commit_size_request_words);
|
|
477 |
if (block != NULL) {
|
|
478 |
_commit_point = _vmm->committed_high();
|
|
479 |
return true;
|
|
480 |
}
|
|
481 |
// all reserved virtual memory is committed
|
|
482 |
assert(block == NULL, "invariant");
|
|
483 |
assert(_vmm->reserved_high() == _vmm->committed_high(), "invariant");
|
|
484 |
return false;
|
|
485 |
}
|
|
486 |
|
|
487 |
void* JfrVirtualMemory::new_datum() {
|
|
488 |
assert(_vmm != NULL, "invariant");
|
|
489 |
assert(!is_full(), "invariant");
|
|
490 |
if (_top == _commit_point) {
|
|
491 |
if (!commit_memory_block()) {
|
|
492 |
assert(is_full(), "invariant");
|
|
493 |
return NULL;
|
|
494 |
}
|
|
495 |
}
|
|
496 |
assert(_top + _aligned_datum_size_bytes <= _commit_point, "invariant");
|
|
497 |
u1* allocation = _top;
|
|
498 |
_top += _aligned_datum_size_bytes;
|
|
499 |
assert(is_aligned(allocation, _aligned_datum_size_bytes), "invariant");
|
|
500 |
return allocation;
|
|
501 |
}
|
|
502 |
|
|
503 |
void* JfrVirtualMemory::index_ptr(size_t index) {
|
|
504 |
assert((index * _aligned_datum_size_bytes) + _reserved_low < _commit_point, "invariant");
|
|
505 |
return (void*)((index * _aligned_datum_size_bytes) + _reserved_low);
|
|
506 |
}
|
|
507 |
|
|
508 |
void* JfrVirtualMemory::get(size_t index) {
|
|
509 |
return index_ptr(index);
|
|
510 |
}
|
|
511 |
|
|
512 |
size_t JfrVirtualMemory::count() const {
|
|
513 |
return (_top - _reserved_low) / _aligned_datum_size_bytes;
|
|
514 |
}
|
|
515 |
|
|
516 |
size_t JfrVirtualMemory::live_set() const {
|
|
517 |
return _top - _reserved_low;
|
|
518 |
}
|
|
519 |
|
|
520 |
size_t JfrVirtualMemory::reserved_size() const {
|
|
521 |
return _reserved_high - _reserved_low;
|
|
522 |
}
|
|
523 |
|
|
524 |
bool JfrVirtualMemory::compact(size_t index) {
|
|
525 |
assert(index > 0, "invariant");
|
|
526 |
assert(index <= reserved_size(), "invariant");
|
|
527 |
const u1* low = static_cast<u1*>(index_ptr(index));
|
|
528 |
const size_t block_size = _top - low;
|
|
529 |
memcpy(const_cast<u1*>(_reserved_low), low, block_size);
|
|
530 |
_top = const_cast<u1*>(_reserved_low) + block_size;
|
|
531 |
assert(live_set() == block_size, "invariant");
|
|
532 |
return true;
|
|
533 |
}
|