242 lines
9.9 KiB
C++
242 lines
9.9 KiB
C++
/*
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* Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_GC_SHARED_THREADLOCALALLOCBUFFER_HPP
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#define SHARE_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(bool reset_byte_accumulation);
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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_GC_SHARED_THREADLOCALALLOCBUFFER_HPP
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