| /* |
| * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_HPP |
| #define SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_HPP |
| |
| #include "gc/shared/gcUtil.hpp" |
| #include "oops/typeArrayOop.hpp" |
| #include "runtime/perfData.hpp" |
| #include "runtime/vm_version.hpp" |
| |
| class GlobalTLABStats; |
| |
| // ThreadLocalAllocBuffer: a descriptor for thread-local storage used by |
| // the threads for allocation. |
| // It is thread-private at any time, but maybe multiplexed over |
| // time across multiple threads. The park()/unpark() pair is |
| // used to make it available for such multiplexing. |
| class ThreadLocalAllocBuffer: public CHeapObj<mtThread> { |
| friend class VMStructs; |
| friend class JVMCIVMStructs; |
| private: |
| HeapWord* _start; // address of TLAB |
| HeapWord* _top; // address after last allocation |
| HeapWord* _pf_top; // allocation prefetch watermark |
| HeapWord* _end; // allocation end (excluding alignment_reserve) |
| size_t _desired_size; // desired size (including alignment_reserve) |
| size_t _refill_waste_limit; // hold onto tlab if free() is larger than this |
| size_t _allocated_before_last_gc; // total bytes allocated up until the last gc |
| |
| static size_t _max_size; // maximum size of any TLAB |
| static int _reserve_for_allocation_prefetch; // Reserve at the end of the TLAB |
| static unsigned _target_refills; // expected number of refills between GCs |
| |
| unsigned _number_of_refills; |
| unsigned _fast_refill_waste; |
| unsigned _slow_refill_waste; |
| unsigned _gc_waste; |
| unsigned _slow_allocations; |
| |
| AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs |
| |
| void accumulate_statistics(); |
| void initialize_statistics(); |
| |
| void set_start(HeapWord* start) { _start = start; } |
| void set_end(HeapWord* end) { _end = end; } |
| void set_top(HeapWord* top) { _top = top; } |
| void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; } |
| void set_desired_size(size_t desired_size) { _desired_size = desired_size; } |
| void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; } |
| |
| size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; } |
| |
| static int target_refills() { return _target_refills; } |
| size_t initial_desired_size(); |
| |
| size_t remaining() const { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); } |
| |
| // Make parsable and release it. |
| void reset(); |
| |
| // Resize based on amount of allocation, etc. |
| void resize(); |
| |
| void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); } |
| |
| void initialize(HeapWord* start, HeapWord* top, HeapWord* end); |
| |
| void print_stats(const char* tag); |
| |
| Thread* myThread(); |
| |
| // statistics |
| |
| int number_of_refills() const { return _number_of_refills; } |
| int fast_refill_waste() const { return _fast_refill_waste; } |
| int slow_refill_waste() const { return _slow_refill_waste; } |
| int gc_waste() const { return _gc_waste; } |
| int slow_allocations() const { return _slow_allocations; } |
| |
| static GlobalTLABStats* _global_stats; |
| static GlobalTLABStats* global_stats() { return _global_stats; } |
| |
| public: |
| ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight), _allocated_before_last_gc(0) { |
| // do nothing. tlabs must be inited by initialize() calls |
| } |
| |
| static size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); } |
| static size_t max_size() { assert(_max_size != 0, "max_size not set up"); return _max_size; } |
| static size_t max_size_in_bytes() { return max_size() * BytesPerWord; } |
| static void set_max_size(size_t max_size) { _max_size = max_size; } |
| |
| HeapWord* start() const { return _start; } |
| HeapWord* end() const { return _end; } |
| HeapWord* hard_end() const { return _end + alignment_reserve(); } |
| HeapWord* top() const { return _top; } |
| HeapWord* pf_top() const { return _pf_top; } |
| size_t desired_size() const { return _desired_size; } |
| size_t used() const { return pointer_delta(top(), start()); } |
| size_t used_bytes() const { return pointer_delta(top(), start(), 1); } |
| size_t free() const { return pointer_delta(end(), top()); } |
| // Don't discard tlab if remaining space is larger than this. |
| size_t refill_waste_limit() const { return _refill_waste_limit; } |
| |
| // Allocate size HeapWords. The memory is NOT initialized to zero. |
| inline HeapWord* allocate(size_t size); |
| |
| // Reserve space at the end of TLAB |
| static size_t end_reserve() { |
| int reserve_size = typeArrayOopDesc::header_size(T_INT); |
| return MAX2(reserve_size, _reserve_for_allocation_prefetch); |
| } |
| static size_t alignment_reserve() { return align_object_size(end_reserve()); } |
| static size_t alignment_reserve_in_bytes() { return alignment_reserve() * HeapWordSize; } |
| |
| // Return tlab size or remaining space in eden such that the |
| // space is large enough to hold obj_size and necessary fill space. |
| // Otherwise return 0; |
| inline size_t compute_size(size_t obj_size); |
| |
| // Record slow allocation |
| inline void record_slow_allocation(size_t obj_size); |
| |
| // Initialization at startup |
| static void startup_initialization(); |
| |
| // Make an in-use tlab parsable, optionally retiring and/or zapping it. |
| void make_parsable(bool retire, bool zap = true); |
| |
| // Retire in-use tlab before allocation of a new tlab |
| void clear_before_allocation(); |
| |
| // Accumulate statistics across all tlabs before gc |
| static void accumulate_statistics_before_gc(); |
| |
| // Resize tlabs for all threads |
| static void resize_all_tlabs(); |
| |
| void fill(HeapWord* start, HeapWord* top, size_t new_size); |
| void initialize(); |
| |
| static size_t refill_waste_limit_increment() { return TLABWasteIncrement; } |
| |
| // Code generation support |
| static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); } |
| static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end ); } |
| static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top ); } |
| static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top ); } |
| static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); } |
| static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); } |
| |
| static ByteSize number_of_refills_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); } |
| static ByteSize fast_refill_waste_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); } |
| static ByteSize slow_allocations_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); } |
| |
| void verify(); |
| }; |
| |
| class GlobalTLABStats: public CHeapObj<mtThread> { |
| private: |
| |
| // Accumulate perfdata in private variables because |
| // PerfData should be write-only for security reasons |
| // (see perfData.hpp) |
| unsigned _allocating_threads; |
| unsigned _total_refills; |
| unsigned _max_refills; |
| size_t _total_allocation; |
| size_t _total_gc_waste; |
| size_t _max_gc_waste; |
| size_t _total_slow_refill_waste; |
| size_t _max_slow_refill_waste; |
| size_t _total_fast_refill_waste; |
| size_t _max_fast_refill_waste; |
| unsigned _total_slow_allocations; |
| unsigned _max_slow_allocations; |
| |
| PerfVariable* _perf_allocating_threads; |
| PerfVariable* _perf_total_refills; |
| PerfVariable* _perf_max_refills; |
| PerfVariable* _perf_allocation; |
| PerfVariable* _perf_gc_waste; |
| PerfVariable* _perf_max_gc_waste; |
| PerfVariable* _perf_slow_refill_waste; |
| PerfVariable* _perf_max_slow_refill_waste; |
| PerfVariable* _perf_fast_refill_waste; |
| PerfVariable* _perf_max_fast_refill_waste; |
| PerfVariable* _perf_slow_allocations; |
| PerfVariable* _perf_max_slow_allocations; |
| |
| AdaptiveWeightedAverage _allocating_threads_avg; |
| |
| public: |
| GlobalTLABStats(); |
| |
| // Initialize all counters |
| void initialize(); |
| |
| // Write all perf counters to the perf_counters |
| void publish(); |
| |
| void print(); |
| |
| // Accessors |
| unsigned allocating_threads_avg() { |
| return MAX2((unsigned)(_allocating_threads_avg.average() + 0.5), 1U); |
| } |
| |
| size_t allocation() { |
| return _total_allocation; |
| } |
| |
| // Update methods |
| |
| void update_allocating_threads() { |
| _allocating_threads++; |
| } |
| void update_number_of_refills(unsigned value) { |
| _total_refills += value; |
| _max_refills = MAX2(_max_refills, value); |
| } |
| void update_allocation(size_t value) { |
| _total_allocation += value; |
| } |
| void update_gc_waste(size_t value) { |
| _total_gc_waste += value; |
| _max_gc_waste = MAX2(_max_gc_waste, value); |
| } |
| void update_fast_refill_waste(size_t value) { |
| _total_fast_refill_waste += value; |
| _max_fast_refill_waste = MAX2(_max_fast_refill_waste, value); |
| } |
| void update_slow_refill_waste(size_t value) { |
| _total_slow_refill_waste += value; |
| _max_slow_refill_waste = MAX2(_max_slow_refill_waste, value); |
| } |
| void update_slow_allocations(unsigned value) { |
| _total_slow_allocations += value; |
| _max_slow_allocations = MAX2(_max_slow_allocations, value); |
| } |
| }; |
| |
| #endif // SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_HPP |