author | chegar |
Thu, 17 Oct 2019 20:54:25 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58679 | 9c3209ff7550 |
parent 58678 | 9cf78a70fa4f |
parent 58021 | 5f5ca2e02f6e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. |
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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 "gc/epsilon/epsilonHeap.hpp" |
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#include "gc/epsilon/epsilonMemoryPool.hpp" |
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#include "gc/epsilon/epsilonThreadLocalData.hpp" |
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#include "gc/shared/gcArguments.hpp" |
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#include "gc/shared/locationPrinter.inline.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "memory/universe.hpp" |
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#include "runtime/globals.hpp" |
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jint EpsilonHeap::initialize() { |
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size_t align = HeapAlignment; |
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size_t init_byte_size = align_up(InitialHeapSize, align); |
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size_t max_byte_size = align_up(MaxHeapSize, align); |
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// Initialize backing storage |
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ReservedHeapSpace heap_rs = Universe::reserve_heap(max_byte_size, align); |
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_virtual_space.initialize(heap_rs, init_byte_size); |
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MemRegion committed_region((HeapWord*)_virtual_space.low(), (HeapWord*)_virtual_space.high()); |
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MemRegion reserved_region((HeapWord*)_virtual_space.low_boundary(), (HeapWord*)_virtual_space.high_boundary()); |
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initialize_reserved_region(heap_rs); |
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_space = new ContiguousSpace(); |
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_space->initialize(committed_region, /* clear_space = */ true, /* mangle_space = */ true); |
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// Precompute hot fields |
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_max_tlab_size = MIN2(CollectedHeap::max_tlab_size(), align_object_size(EpsilonMaxTLABSize / HeapWordSize)); |
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_step_counter_update = MIN2<size_t>(max_byte_size / 16, EpsilonUpdateCountersStep); |
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_step_heap_print = (EpsilonPrintHeapSteps == 0) ? SIZE_MAX : (max_byte_size / EpsilonPrintHeapSteps); |
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_decay_time_ns = (int64_t) EpsilonTLABDecayTime * NANOSECS_PER_MILLISEC; |
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// Enable monitoring |
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_monitoring_support = new EpsilonMonitoringSupport(this); |
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_last_counter_update = 0; |
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_last_heap_print = 0; |
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// Install barrier set |
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BarrierSet::set_barrier_set(new EpsilonBarrierSet()); |
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// All done, print out the configuration |
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if (init_byte_size != max_byte_size) { |
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log_info(gc)("Resizeable heap; starting at " SIZE_FORMAT "M, max: " SIZE_FORMAT "M, step: " SIZE_FORMAT "M", |
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init_byte_size / M, max_byte_size / M, EpsilonMinHeapExpand / M); |
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} else { |
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log_info(gc)("Non-resizeable heap; start/max: " SIZE_FORMAT "M", init_byte_size / M); |
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} |
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if (UseTLAB) { |
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log_info(gc)("Using TLAB allocation; max: " SIZE_FORMAT "K", _max_tlab_size * HeapWordSize / K); |
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if (EpsilonElasticTLAB) { |
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log_info(gc)("Elastic TLABs enabled; elasticity: %.2fx", EpsilonTLABElasticity); |
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} |
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if (EpsilonElasticTLABDecay) { |
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log_info(gc)("Elastic TLABs decay enabled; decay time: " SIZE_FORMAT "ms", EpsilonTLABDecayTime); |
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} |
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} else { |
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log_info(gc)("Not using TLAB allocation"); |
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} |
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return JNI_OK; |
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} |
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void EpsilonHeap::post_initialize() { |
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CollectedHeap::post_initialize(); |
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} |
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void EpsilonHeap::initialize_serviceability() { |
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_pool = new EpsilonMemoryPool(this); |
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_memory_manager.add_pool(_pool); |
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} |
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GrowableArray<GCMemoryManager*> EpsilonHeap::memory_managers() { |
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GrowableArray<GCMemoryManager*> memory_managers(1); |
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memory_managers.append(&_memory_manager); |
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return memory_managers; |
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} |
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GrowableArray<MemoryPool*> EpsilonHeap::memory_pools() { |
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GrowableArray<MemoryPool*> memory_pools(1); |
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memory_pools.append(_pool); |
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return memory_pools; |
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} |
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size_t EpsilonHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
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// Return max allocatable TLAB size, and let allocation path figure out |
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// the actual allocation size. Note: result should be in bytes. |
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return _max_tlab_size * HeapWordSize; |
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} |
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EpsilonHeap* EpsilonHeap::heap() { |
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CollectedHeap* heap = Universe::heap(); |
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assert(heap != NULL, "Uninitialized access to EpsilonHeap::heap()"); |
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assert(heap->kind() == CollectedHeap::Epsilon, "Not an Epsilon heap"); |
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return (EpsilonHeap*)heap; |
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} |
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|
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HeapWord* EpsilonHeap::allocate_work(size_t size) { |
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assert(is_object_aligned(size), "Allocation size should be aligned: " SIZE_FORMAT, size); |
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|
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HeapWord* res = _space->par_allocate(size); |
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|
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while (res == NULL) { |
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// Allocation failed, attempt expansion, and retry: |
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MutexLocker ml(Heap_lock); |
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|
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size_t space_left = max_capacity() - capacity(); |
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size_t want_space = MAX2(size, EpsilonMinHeapExpand); |
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|
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if (want_space < space_left) { |
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// Enough space to expand in bulk: |
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bool expand = _virtual_space.expand_by(want_space); |
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assert(expand, "Should be able to expand"); |
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} else if (size < space_left) { |
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// No space to expand in bulk, and this allocation is still possible, |
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// take all the remaining space: |
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bool expand = _virtual_space.expand_by(space_left); |
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assert(expand, "Should be able to expand"); |
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} else { |
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// No space left: |
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return NULL; |
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} |
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|
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_space->set_end((HeapWord *) _virtual_space.high()); |
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res = _space->par_allocate(size); |
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} |
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size_t used = _space->used(); |
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// Allocation successful, update counters |
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{ |
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size_t last = _last_counter_update; |
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if ((used - last >= _step_counter_update) && Atomic::cmpxchg(used, &_last_counter_update, last) == last) { |
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_monitoring_support->update_counters(); |
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} |
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} |
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|
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// ...and print the occupancy line, if needed |
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{ |
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size_t last = _last_heap_print; |
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if ((used - last >= _step_heap_print) && Atomic::cmpxchg(used, &_last_heap_print, last) == last) { |
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print_heap_info(used); |
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print_metaspace_info(); |
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} |
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} |
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|
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assert(is_object_aligned(res), "Object should be aligned: " PTR_FORMAT, p2i(res)); |
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return res; |
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} |
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|
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HeapWord* EpsilonHeap::allocate_new_tlab(size_t min_size, |
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size_t requested_size, |
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size_t* actual_size) { |
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Thread* thread = Thread::current(); |
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|
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// Defaults in case elastic paths are not taken |
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bool fits = true; |
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size_t size = requested_size; |
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size_t ergo_tlab = requested_size; |
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int64_t time = 0; |
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|
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if (EpsilonElasticTLAB) { |
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ergo_tlab = EpsilonThreadLocalData::ergo_tlab_size(thread); |
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|
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if (EpsilonElasticTLABDecay) { |
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int64_t last_time = EpsilonThreadLocalData::last_tlab_time(thread); |
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time = (int64_t) os::javaTimeNanos(); |
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|
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assert(last_time <= time, "time should be monotonic"); |
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|
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// If the thread had not allocated recently, retract the ergonomic size. |
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// This conserves memory when the thread had initial burst of allocations, |
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// and then started allocating only sporadically. |
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if (last_time != 0 && (time - last_time > _decay_time_ns)) { |
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ergo_tlab = 0; |
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EpsilonThreadLocalData::set_ergo_tlab_size(thread, 0); |
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} |
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} |
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|
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// If we can fit the allocation under current TLAB size, do so. |
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// Otherwise, we want to elastically increase the TLAB size. |
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fits = (requested_size <= ergo_tlab); |
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if (!fits) { |
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size = (size_t) (ergo_tlab * EpsilonTLABElasticity); |
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} |
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} |
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|
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// Always honor boundaries |
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size = MAX2(min_size, MIN2(_max_tlab_size, size)); |
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|
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// Always honor alignment |
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size = align_up(size, MinObjAlignment); |
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|
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// Check that adjustments did not break local and global invariants |
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assert(is_object_aligned(size), |
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"Size honors object alignment: " SIZE_FORMAT, size); |
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assert(min_size <= size, |
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"Size honors min size: " SIZE_FORMAT " <= " SIZE_FORMAT, min_size, size); |
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assert(size <= _max_tlab_size, |
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"Size honors max size: " SIZE_FORMAT " <= " SIZE_FORMAT, size, _max_tlab_size); |
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assert(size <= CollectedHeap::max_tlab_size(), |
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"Size honors global max size: " SIZE_FORMAT " <= " SIZE_FORMAT, size, CollectedHeap::max_tlab_size()); |
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|
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if (log_is_enabled(Trace, gc)) { |
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ResourceMark rm; |
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log_trace(gc)("TLAB size for \"%s\" (Requested: " SIZE_FORMAT "K, Min: " SIZE_FORMAT |
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"K, Max: " SIZE_FORMAT "K, Ergo: " SIZE_FORMAT "K) -> " SIZE_FORMAT "K", |
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thread->name(), |
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requested_size * HeapWordSize / K, |
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min_size * HeapWordSize / K, |
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_max_tlab_size * HeapWordSize / K, |
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ergo_tlab * HeapWordSize / K, |
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size * HeapWordSize / K); |
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} |
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|
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// All prepared, let's do it! |
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HeapWord* res = allocate_work(size); |
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|
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if (res != NULL) { |
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// Allocation successful |
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*actual_size = size; |
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if (EpsilonElasticTLABDecay) { |
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EpsilonThreadLocalData::set_last_tlab_time(thread, time); |
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} |
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if (EpsilonElasticTLAB && !fits) { |
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// If we requested expansion, this is our new ergonomic TLAB size |
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EpsilonThreadLocalData::set_ergo_tlab_size(thread, size); |
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} |
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} else { |
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// Allocation failed, reset ergonomics to try and fit smaller TLABs |
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if (EpsilonElasticTLAB) { |
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EpsilonThreadLocalData::set_ergo_tlab_size(thread, 0); |
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} |
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} |
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|
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return res; |
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} |
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|
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HeapWord* EpsilonHeap::mem_allocate(size_t size, bool *gc_overhead_limit_was_exceeded) { |
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*gc_overhead_limit_was_exceeded = false; |
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return allocate_work(size); |
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} |
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|
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void EpsilonHeap::collect(GCCause::Cause cause) { |
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switch (cause) { |
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case GCCause::_metadata_GC_threshold: |
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case GCCause::_metadata_GC_clear_soft_refs: |
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// Receiving these causes means the VM itself entered the safepoint for metadata collection. |
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// While Epsilon does not do GC, it has to perform sizing adjustments, otherwise we would |
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// re-enter the safepoint again very soon. |
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|
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assert(SafepointSynchronize::is_at_safepoint(), "Expected at safepoint"); |
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log_info(gc)("GC request for \"%s\" is handled", GCCause::to_string(cause)); |
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MetaspaceGC::compute_new_size(); |
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print_metaspace_info(); |
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break; |
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default: |
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log_info(gc)("GC request for \"%s\" is ignored", GCCause::to_string(cause)); |
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} |
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_monitoring_support->update_counters(); |
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} |
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|
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void EpsilonHeap::do_full_collection(bool clear_all_soft_refs) { |
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collect(gc_cause()); |
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} |
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|
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void EpsilonHeap::safe_object_iterate(ObjectClosure *cl) { |
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_space->safe_object_iterate(cl); |
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} |
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|
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void EpsilonHeap::print_on(outputStream *st) const { |
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st->print_cr("Epsilon Heap"); |
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|
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// Cast away constness: |
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((VirtualSpace)_virtual_space).print_on(st); |
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|
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st->print_cr("Allocation space:"); |
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_space->print_on(st); |
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|
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MetaspaceUtils::print_on(st); |
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} |
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|
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bool EpsilonHeap::print_location(outputStream* st, void* addr) const { |
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return BlockLocationPrinter<EpsilonHeap>::print_location(st, addr); |
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} |
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|
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void EpsilonHeap::print_tracing_info() const { |
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print_heap_info(used()); |
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print_metaspace_info(); |
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} |
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|
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void EpsilonHeap::print_heap_info(size_t used) const { |
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size_t reserved = max_capacity(); |
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size_t committed = capacity(); |
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|
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if (reserved != 0) { |
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log_info(gc)("Heap: " SIZE_FORMAT "%s reserved, " SIZE_FORMAT "%s (%.2f%%) committed, " |
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SIZE_FORMAT "%s (%.2f%%) used", |
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byte_size_in_proper_unit(reserved), proper_unit_for_byte_size(reserved), |
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byte_size_in_proper_unit(committed), proper_unit_for_byte_size(committed), |
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committed * 100.0 / reserved, |
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byte_size_in_proper_unit(used), proper_unit_for_byte_size(used), |
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used * 100.0 / reserved); |
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330 |
} else { |
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log_info(gc)("Heap: no reliable data"); |
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} |
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} |
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|
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void EpsilonHeap::print_metaspace_info() const { |
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size_t reserved = MetaspaceUtils::reserved_bytes(); |
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size_t committed = MetaspaceUtils::committed_bytes(); |
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size_t used = MetaspaceUtils::used_bytes(); |
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|
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if (reserved != 0) { |
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log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "%s reserved, " SIZE_FORMAT "%s (%.2f%%) committed, " |
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SIZE_FORMAT "%s (%.2f%%) used", |
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byte_size_in_proper_unit(reserved), proper_unit_for_byte_size(reserved), |
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byte_size_in_proper_unit(committed), proper_unit_for_byte_size(committed), |
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committed * 100.0 / reserved, |
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byte_size_in_proper_unit(used), proper_unit_for_byte_size(used), |
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used * 100.0 / reserved); |
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348 |
} else { |
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log_info(gc, metaspace)("Metaspace: no reliable data"); |
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} |
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} |