author | pliden |
Wed, 05 Dec 2018 17:11:22 +0100 | |
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/* |
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* Copyright (c) 1999, 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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#ifndef SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_HPP |
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#define SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_HPP |
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#include "gc/shared/gcUtil.hpp" |
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#include "runtime/perfData.hpp" |
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#include "runtime/vm_version.hpp" |
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class ThreadLocalAllocStats; |
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// ThreadLocalAllocBuffer: a descriptor for thread-local storage used by |
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// the threads for allocation. |
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// It is thread-private at any time, but maybe multiplexed over |
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// time across multiple threads. The park()/unpark() pair is |
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// used to make it available for such multiplexing. |
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// |
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// Heap sampling is performed via the end and allocation_end |
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// fields. |
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// allocation_end contains the real end of the tlab allocation, |
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// whereas end can be set to an arbitrary spot in the tlab to |
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// trip the return and sample the allocation. |
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class ThreadLocalAllocBuffer: public CHeapObj<mtThread> { |
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friend class VMStructs; |
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friend class JVMCIVMStructs; |
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private: |
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HeapWord* _start; // address of TLAB |
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HeapWord* _top; // address after last allocation |
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HeapWord* _pf_top; // allocation prefetch watermark |
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HeapWord* _end; // allocation end (can be the sampling end point or _allocation_end) |
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HeapWord* _allocation_end; // end for allocations (actual TLAB end, excluding alignment_reserve) |
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size_t _desired_size; // desired size (including alignment_reserve) |
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size_t _refill_waste_limit; // hold onto tlab if free() is larger than this |
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size_t _allocated_before_last_gc; // total bytes allocated up until the last gc |
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size_t _bytes_since_last_sample_point; // bytes since last sample point. |
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static size_t _max_size; // maximum size of any TLAB |
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static int _reserve_for_allocation_prefetch; // Reserve at the end of the TLAB |
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static unsigned _target_refills; // expected number of refills between GCs |
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unsigned _number_of_refills; |
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unsigned _fast_refill_waste; |
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unsigned _slow_refill_waste; |
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unsigned _gc_waste; |
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unsigned _slow_allocations; |
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size_t _allocated_size; |
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AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs |
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void reset_statistics(); |
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void set_start(HeapWord* start) { _start = start; } |
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void set_end(HeapWord* end) { _end = end; } |
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void set_allocation_end(HeapWord* ptr) { _allocation_end = ptr; } |
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void set_top(HeapWord* top) { _top = top; } |
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void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; } |
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void set_desired_size(size_t desired_size) { _desired_size = desired_size; } |
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void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; } |
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size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; } |
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static int target_refills() { return _target_refills; } |
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size_t initial_desired_size(); |
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size_t remaining(); |
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// Make parsable and release it. |
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void reset(); |
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void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); } |
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void initialize(HeapWord* start, HeapWord* top, HeapWord* end); |
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void insert_filler(); |
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void accumulate_and_reset_statistics(ThreadLocalAllocStats* stats); |
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void print_stats(const char* tag); |
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Thread* thread(); |
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// statistics |
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int number_of_refills() const { return _number_of_refills; } |
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int fast_refill_waste() const { return _fast_refill_waste; } |
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int slow_refill_waste() const { return _slow_refill_waste; } |
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int gc_waste() const { return _gc_waste; } |
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int slow_allocations() const { return _slow_allocations; } |
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public: |
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ThreadLocalAllocBuffer() : _allocated_before_last_gc(0), _allocation_fraction(TLABAllocationWeight) { |
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// do nothing. tlabs must be inited by initialize() calls |
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} |
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static size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); } |
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static size_t max_size() { assert(_max_size != 0, "max_size not set up"); return _max_size; } |
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static size_t max_size_in_bytes() { return max_size() * BytesPerWord; } |
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static void set_max_size(size_t max_size) { _max_size = max_size; } |
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HeapWord* start() const { return _start; } |
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HeapWord* end() const { return _end; } |
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HeapWord* top() const { return _top; } |
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HeapWord* hard_end(); |
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HeapWord* pf_top() const { return _pf_top; } |
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size_t desired_size() const { return _desired_size; } |
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size_t used() const { return pointer_delta(top(), start()); } |
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size_t used_bytes() const { return pointer_delta(top(), start(), 1); } |
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size_t free() const { return pointer_delta(end(), top()); } |
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// Don't discard tlab if remaining space is larger than this. |
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size_t refill_waste_limit() const { return _refill_waste_limit; } |
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size_t bytes_since_last_sample_point() const { return _bytes_since_last_sample_point; } |
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// Allocate size HeapWords. The memory is NOT initialized to zero. |
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inline HeapWord* allocate(size_t size); |
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// Reserve space at the end of TLAB |
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static size_t end_reserve(); |
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static size_t alignment_reserve() { return align_object_size(end_reserve()); } |
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static size_t alignment_reserve_in_bytes() { return alignment_reserve() * HeapWordSize; } |
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// Return tlab size or remaining space in eden such that the |
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// space is large enough to hold obj_size and necessary fill space. |
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// Otherwise return 0; |
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inline size_t compute_size(size_t obj_size); |
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// Compute the minimal needed tlab size for the given object size. |
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static inline size_t compute_min_size(size_t obj_size); |
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// Record slow allocation |
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inline void record_slow_allocation(size_t obj_size); |
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// Initialization at startup |
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static void startup_initialization(); |
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// Make an in-use tlab parsable. |
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void make_parsable(); |
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// Retire an in-use tlab and optionally collect statistics. |
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void retire(ThreadLocalAllocStats* stats = NULL); |
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// Retire in-use tlab before allocation of a new tlab |
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void retire_before_allocation(); |
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// Resize based on amount of allocation, etc. |
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void resize(); |
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void fill(HeapWord* start, HeapWord* top, size_t new_size); |
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void initialize(); |
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void set_back_allocation_end(); |
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void set_sample_end(); |
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static size_t refill_waste_limit_increment() { return TLABWasteIncrement; } |
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template <typename T> void addresses_do(T f) { |
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f(&_start); |
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f(&_top); |
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f(&_pf_top); |
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f(&_end); |
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f(&_allocation_end); |
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} |
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// Code generation support |
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static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); } |
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static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end); } |
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static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top); } |
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static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top); } |
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}; |
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class ThreadLocalAllocStats : public StackObj { |
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private: |
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static PerfVariable* _perf_allocating_threads; |
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static PerfVariable* _perf_total_refills; |
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static PerfVariable* _perf_max_refills; |
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static PerfVariable* _perf_total_allocations; |
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static PerfVariable* _perf_total_gc_waste; |
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static PerfVariable* _perf_max_gc_waste; |
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static PerfVariable* _perf_total_slow_refill_waste; |
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static PerfVariable* _perf_max_slow_refill_waste; |
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static PerfVariable* _perf_total_fast_refill_waste; |
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static PerfVariable* _perf_max_fast_refill_waste; |
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static PerfVariable* _perf_total_slow_allocations; |
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static PerfVariable* _perf_max_slow_allocations; |
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static AdaptiveWeightedAverage _allocating_threads_avg; |
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unsigned int _allocating_threads; |
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unsigned int _total_refills; |
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unsigned int _max_refills; |
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size_t _total_allocations; |
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size_t _total_gc_waste; |
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size_t _max_gc_waste; |
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size_t _total_fast_refill_waste; |
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size_t _max_fast_refill_waste; |
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size_t _total_slow_refill_waste; |
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size_t _max_slow_refill_waste; |
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unsigned int _total_slow_allocations; |
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unsigned int _max_slow_allocations; |
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public: |
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static void initialize(); |
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static unsigned int allocating_threads_avg(); |
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ThreadLocalAllocStats(); |
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void update_fast_allocations(unsigned int refills, |
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size_t allocations, |
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size_t gc_waste, |
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size_t fast_refill_waste, |
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size_t slow_refill_waste); |
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void update_slow_allocations(unsigned int allocations); |
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void update(const ThreadLocalAllocStats& other); |
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void reset(); |
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void publish(); |
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}; |
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#endif // SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_HPP |