243 lines
9.3 KiB
C++
243 lines
9.3 KiB
C++
/*
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* Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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class GlobalTLABStats;
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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 avaiable for such multiplexing.
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class ThreadLocalAllocBuffer: public CHeapObj {
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friend class VMStructs;
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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 (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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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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AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs
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void accumulate_statistics();
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void initialize_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_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() const { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); }
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// Make parsable and release it.
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void reset();
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// Resize based on amount of allocation, etc.
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void resize();
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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 print_stats(const char* tag);
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Thread* myThread();
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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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static GlobalTLABStats* _global_stats;
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static GlobalTLABStats* global_stats() { return _global_stats; }
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public:
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ThreadLocalAllocBuffer() : _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 const size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize); }
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static const size_t 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* hard_end() const { return _end + alignment_reserve(); }
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HeapWord* top() const { return _top; }
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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 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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// Allocate size HeapWords. The memory is NOT initialized to zero.
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inline HeapWord* allocate(size_t size);
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static size_t alignment_reserve() { return align_object_size(typeArrayOopDesc::header_size(T_INT)); }
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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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// 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, optionally also retiring it.
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void make_parsable(bool retire);
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// Retire in-use tlab before allocation of a new tlab
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void clear_before_allocation();
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// Accumulate statistics across all tlabs before gc
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static void accumulate_statistics_before_gc();
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// Resize tlabs for all threads
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static void resize_all_tlabs();
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void fill(HeapWord* start, HeapWord* top, size_t new_size);
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void initialize();
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static size_t refill_waste_limit_increment() { return TLABWasteIncrement; }
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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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static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); }
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static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); }
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static ByteSize number_of_refills_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); }
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static ByteSize fast_refill_waste_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); }
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static ByteSize slow_allocations_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); }
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void verify();
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};
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class GlobalTLABStats: public CHeapObj {
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private:
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// Accumulate perfdata in private variables because
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// PerfData should be write-only for security reasons
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// (see perfData.hpp)
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unsigned _allocating_threads;
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unsigned _total_refills;
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unsigned _max_refills;
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size_t _total_allocation;
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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_slow_refill_waste;
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size_t _max_slow_refill_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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unsigned _total_slow_allocations;
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unsigned _max_slow_allocations;
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PerfVariable* _perf_allocating_threads;
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PerfVariable* _perf_total_refills;
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PerfVariable* _perf_max_refills;
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PerfVariable* _perf_allocation;
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PerfVariable* _perf_gc_waste;
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PerfVariable* _perf_max_gc_waste;
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PerfVariable* _perf_slow_refill_waste;
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PerfVariable* _perf_max_slow_refill_waste;
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PerfVariable* _perf_fast_refill_waste;
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PerfVariable* _perf_max_fast_refill_waste;
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PerfVariable* _perf_slow_allocations;
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PerfVariable* _perf_max_slow_allocations;
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AdaptiveWeightedAverage _allocating_threads_avg;
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public:
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GlobalTLABStats();
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// Initialize all counters
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void initialize();
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// Write all perf counters to the perf_counters
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void publish();
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void print();
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// Accessors
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unsigned allocating_threads_avg() {
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return MAX2((unsigned)(_allocating_threads_avg.average() + 0.5), 1U);
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}
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size_t allocation() {
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return _total_allocation;
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}
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// Update methods
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void update_allocating_threads() {
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_allocating_threads++;
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}
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void update_number_of_refills(unsigned value) {
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_total_refills += value;
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_max_refills = MAX2(_max_refills, value);
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}
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void update_allocation(size_t value) {
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_total_allocation += value;
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}
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void update_gc_waste(size_t value) {
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_total_gc_waste += value;
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_max_gc_waste = MAX2(_max_gc_waste, value);
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}
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void update_fast_refill_waste(size_t value) {
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_total_fast_refill_waste += value;
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_max_fast_refill_waste = MAX2(_max_fast_refill_waste, value);
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}
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void update_slow_refill_waste(size_t value) {
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_total_slow_refill_waste += value;
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_max_slow_refill_waste = MAX2(_max_slow_refill_waste, value);
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}
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void update_slow_allocations(unsigned value) {
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_total_slow_allocations += value;
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_max_slow_allocations = MAX2(_max_slow_allocations, value);
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}
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};
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