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8187443: Forest Consolidation: Move files to unified layout
Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson
parent
270fe13182
commit
3789983e89
56923 changed files with 3 additions and 15727 deletions
436
src/hotspot/share/gc/shared/threadLocalAllocBuffer.cpp
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436
src/hotspot/share/gc/shared/threadLocalAllocBuffer.cpp
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/*
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* Copyright (c) 1999, 2015, 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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#include "precompiled.hpp"
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#include "gc/shared/genCollectedHeap.hpp"
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#include "gc/shared/threadLocalAllocBuffer.inline.hpp"
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#include "logging/log.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/thread.inline.hpp"
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#include "utilities/copy.hpp"
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// Thread-Local Edens support
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// static member initialization
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size_t ThreadLocalAllocBuffer::_max_size = 0;
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int ThreadLocalAllocBuffer::_reserve_for_allocation_prefetch = 0;
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unsigned ThreadLocalAllocBuffer::_target_refills = 0;
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GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL;
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void ThreadLocalAllocBuffer::clear_before_allocation() {
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_slow_refill_waste += (unsigned)remaining();
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make_parsable(true); // also retire the TLAB
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}
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void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
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global_stats()->initialize();
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for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
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thread->tlab().accumulate_statistics();
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thread->tlab().initialize_statistics();
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}
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// Publish new stats if some allocation occurred.
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if (global_stats()->allocation() != 0) {
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global_stats()->publish();
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global_stats()->print();
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}
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}
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void ThreadLocalAllocBuffer::accumulate_statistics() {
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Thread* thread = myThread();
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size_t capacity = Universe::heap()->tlab_capacity(thread);
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size_t used = Universe::heap()->tlab_used(thread);
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_gc_waste += (unsigned)remaining();
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size_t total_allocated = thread->allocated_bytes();
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size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc;
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_allocated_before_last_gc = total_allocated;
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print_stats("gc");
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if (_number_of_refills > 0) {
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// Update allocation history if a reasonable amount of eden was allocated.
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bool update_allocation_history = used > 0.5 * capacity;
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if (update_allocation_history) {
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// Average the fraction of eden allocated in a tlab by this
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// thread for use in the next resize operation.
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// _gc_waste is not subtracted because it's included in
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// "used".
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// The result can be larger than 1.0 due to direct to old allocations.
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// These allocations should ideally not be counted but since it is not possible
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// to filter them out here we just cap the fraction to be at most 1.0.
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double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used);
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_allocation_fraction.sample(alloc_frac);
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}
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global_stats()->update_allocating_threads();
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global_stats()->update_number_of_refills(_number_of_refills);
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global_stats()->update_allocation(_number_of_refills * desired_size());
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global_stats()->update_gc_waste(_gc_waste);
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global_stats()->update_slow_refill_waste(_slow_refill_waste);
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global_stats()->update_fast_refill_waste(_fast_refill_waste);
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} else {
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assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&
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_slow_refill_waste == 0 && _gc_waste == 0,
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"tlab stats == 0");
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}
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global_stats()->update_slow_allocations(_slow_allocations);
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}
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// Fills the current tlab with a dummy filler array to create
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// an illusion of a contiguous Eden and optionally retires the tlab.
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// Waste accounting should be done in caller as appropriate; see,
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// for example, clear_before_allocation().
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void ThreadLocalAllocBuffer::make_parsable(bool retire, bool zap) {
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if (end() != NULL) {
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invariants();
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if (retire) {
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myThread()->incr_allocated_bytes(used_bytes());
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}
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CollectedHeap::fill_with_object(top(), hard_end(), retire && zap);
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if (retire || ZeroTLAB) { // "Reset" the TLAB
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set_start(NULL);
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set_top(NULL);
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set_pf_top(NULL);
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set_end(NULL);
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}
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}
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assert(!(retire || ZeroTLAB) ||
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(start() == NULL && end() == NULL && top() == NULL),
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"TLAB must be reset");
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}
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void ThreadLocalAllocBuffer::resize_all_tlabs() {
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if (ResizeTLAB) {
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for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
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thread->tlab().resize();
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}
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}
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}
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void ThreadLocalAllocBuffer::resize() {
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// Compute the next tlab size using expected allocation amount
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assert(ResizeTLAB, "Should not call this otherwise");
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size_t alloc = (size_t)(_allocation_fraction.average() *
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(Universe::heap()->tlab_capacity(myThread()) / HeapWordSize));
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size_t new_size = alloc / _target_refills;
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new_size = MIN2(MAX2(new_size, min_size()), max_size());
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size_t aligned_new_size = align_object_size(new_size);
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log_trace(gc, tlab)("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]"
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" refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT,
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p2i(myThread()), myThread()->osthread()->thread_id(),
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_target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size);
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set_desired_size(aligned_new_size);
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set_refill_waste_limit(initial_refill_waste_limit());
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}
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void ThreadLocalAllocBuffer::initialize_statistics() {
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_number_of_refills = 0;
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_fast_refill_waste = 0;
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_slow_refill_waste = 0;
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_gc_waste = 0;
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_slow_allocations = 0;
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}
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void ThreadLocalAllocBuffer::fill(HeapWord* start,
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HeapWord* top,
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size_t new_size) {
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_number_of_refills++;
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print_stats("fill");
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assert(top <= start + new_size - alignment_reserve(), "size too small");
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initialize(start, top, start + new_size - alignment_reserve());
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// Reset amount of internal fragmentation
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set_refill_waste_limit(initial_refill_waste_limit());
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}
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void ThreadLocalAllocBuffer::initialize(HeapWord* start,
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HeapWord* top,
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HeapWord* end) {
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set_start(start);
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set_top(top);
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set_pf_top(top);
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set_end(end);
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invariants();
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}
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void ThreadLocalAllocBuffer::initialize() {
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initialize(NULL, // start
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NULL, // top
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NULL); // end
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set_desired_size(initial_desired_size());
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// Following check is needed because at startup the main (primordial)
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// thread is initialized before the heap is. The initialization for
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// this thread is redone in startup_initialization below.
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if (Universe::heap() != NULL) {
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size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
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double alloc_frac = desired_size() * target_refills() / (double) capacity;
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_allocation_fraction.sample(alloc_frac);
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}
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set_refill_waste_limit(initial_refill_waste_limit());
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initialize_statistics();
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}
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void ThreadLocalAllocBuffer::startup_initialization() {
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// Assuming each thread's active tlab is, on average,
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// 1/2 full at a GC
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_target_refills = 100 / (2 * TLABWasteTargetPercent);
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_target_refills = MAX2(_target_refills, (unsigned)1U);
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_global_stats = new GlobalTLABStats();
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#ifdef COMPILER2
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// If the C2 compiler is present, extra space is needed at the end of
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// TLABs, otherwise prefetching instructions generated by the C2
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// compiler will fault (due to accessing memory outside of heap).
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// The amount of space is the max of the number of lines to
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// prefetch for array and for instance allocations. (Extra space must be
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// reserved to accommodate both types of allocations.)
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//
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// Only SPARC-specific BIS instructions are known to fault. (Those
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// instructions are generated if AllocatePrefetchStyle==3 and
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// AllocatePrefetchInstr==1). To be on the safe side, however,
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// extra space is reserved for all combinations of
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// AllocatePrefetchStyle and AllocatePrefetchInstr.
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//
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// If the C2 compiler is not present, no space is reserved.
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// +1 for rounding up to next cache line, +1 to be safe
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if (is_server_compilation_mode_vm()) {
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int lines = MAX2(AllocatePrefetchLines, AllocateInstancePrefetchLines) + 2;
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_reserve_for_allocation_prefetch = (AllocatePrefetchDistance + AllocatePrefetchStepSize * lines) /
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(int)HeapWordSize;
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}
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#endif
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// During jvm startup, the main (primordial) thread is initialized
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// before the heap is initialized. So reinitialize it now.
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guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");
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Thread::current()->tlab().initialize();
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log_develop_trace(gc, tlab)("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT,
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min_size(), Thread::current()->tlab().initial_desired_size(), max_size());
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}
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size_t ThreadLocalAllocBuffer::initial_desired_size() {
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size_t init_sz = 0;
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if (TLABSize > 0) {
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init_sz = TLABSize / HeapWordSize;
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} else if (global_stats() != NULL) {
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// Initial size is a function of the average number of allocating threads.
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unsigned nof_threads = global_stats()->allocating_threads_avg();
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init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /
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(nof_threads * target_refills());
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init_sz = align_object_size(init_sz);
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}
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init_sz = MIN2(MAX2(init_sz, min_size()), max_size());
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return init_sz;
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}
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void ThreadLocalAllocBuffer::print_stats(const char* tag) {
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Log(gc, tlab) log;
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if (!log.is_trace()) {
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return;
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}
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Thread* thrd = myThread();
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size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste;
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size_t alloc = _number_of_refills * _desired_size;
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double waste_percent = alloc == 0 ? 0.0 :
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100.0 * waste / alloc;
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size_t tlab_used = Universe::heap()->tlab_used(thrd);
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log.trace("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]"
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" desired_size: " SIZE_FORMAT "KB"
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" slow allocs: %d refill waste: " SIZE_FORMAT "B"
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" alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB"
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" slow: %dB fast: %dB",
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tag, p2i(thrd), thrd->osthread()->thread_id(),
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_desired_size / (K / HeapWordSize),
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_slow_allocations, _refill_waste_limit * HeapWordSize,
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_allocation_fraction.average(),
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_allocation_fraction.average() * tlab_used / K,
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_number_of_refills, waste_percent,
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_gc_waste * HeapWordSize,
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_slow_refill_waste * HeapWordSize,
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_fast_refill_waste * HeapWordSize);
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}
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void ThreadLocalAllocBuffer::verify() {
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HeapWord* p = start();
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HeapWord* t = top();
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HeapWord* prev_p = NULL;
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while (p < t) {
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oop(p)->verify();
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prev_p = p;
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p += oop(p)->size();
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}
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guarantee(p == top(), "end of last object must match end of space");
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}
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Thread* ThreadLocalAllocBuffer::myThread() {
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return (Thread*)(((char *)this) +
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in_bytes(start_offset()) -
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in_bytes(Thread::tlab_start_offset()));
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}
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GlobalTLABStats::GlobalTLABStats() :
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_allocating_threads_avg(TLABAllocationWeight) {
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initialize();
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_allocating_threads_avg.sample(1); // One allocating thread at startup
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if (UsePerfData) {
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EXCEPTION_MARK;
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ResourceMark rm;
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char* cname = PerfDataManager::counter_name("tlab", "allocThreads");
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_perf_allocating_threads =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "fills");
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_perf_total_refills =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxFills");
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_perf_max_refills =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "alloc");
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_perf_allocation =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "gcWaste");
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_perf_gc_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxGcWaste");
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_perf_max_gc_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "slowWaste");
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_perf_slow_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxSlowWaste");
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_perf_max_slow_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "fastWaste");
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_perf_fast_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxFastWaste");
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_perf_max_fast_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "slowAlloc");
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_perf_slow_allocations =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc");
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_perf_max_slow_allocations =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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}
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}
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void GlobalTLABStats::initialize() {
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// Clear counters summarizing info from all threads
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_allocating_threads = 0;
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_total_refills = 0;
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_max_refills = 0;
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_total_allocation = 0;
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_total_gc_waste = 0;
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_max_gc_waste = 0;
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_total_slow_refill_waste = 0;
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_max_slow_refill_waste = 0;
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_total_fast_refill_waste = 0;
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_max_fast_refill_waste = 0;
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_total_slow_allocations = 0;
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_max_slow_allocations = 0;
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}
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void GlobalTLABStats::publish() {
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_allocating_threads_avg.sample(_allocating_threads);
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if (UsePerfData) {
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_perf_allocating_threads ->set_value(_allocating_threads);
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_perf_total_refills ->set_value(_total_refills);
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_perf_max_refills ->set_value(_max_refills);
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_perf_allocation ->set_value(_total_allocation);
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_perf_gc_waste ->set_value(_total_gc_waste);
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_perf_max_gc_waste ->set_value(_max_gc_waste);
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_perf_slow_refill_waste ->set_value(_total_slow_refill_waste);
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_perf_max_slow_refill_waste->set_value(_max_slow_refill_waste);
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_perf_fast_refill_waste ->set_value(_total_fast_refill_waste);
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_perf_max_fast_refill_waste->set_value(_max_fast_refill_waste);
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_perf_slow_allocations ->set_value(_total_slow_allocations);
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_perf_max_slow_allocations ->set_value(_max_slow_allocations);
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}
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}
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void GlobalTLABStats::print() {
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Log(gc, tlab) log;
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if (!log.is_debug()) {
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return;
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}
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size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste;
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double waste_percent = _total_allocation == 0 ? 0.0 :
|
||||
100.0 * waste / _total_allocation;
|
||||
log.debug("TLAB totals: thrds: %d refills: %d max: %d"
|
||||
" slow allocs: %d max %d waste: %4.1f%%"
|
||||
" gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
|
||||
" slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
|
||||
" fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B",
|
||||
_allocating_threads,
|
||||
_total_refills, _max_refills,
|
||||
_total_slow_allocations, _max_slow_allocations,
|
||||
waste_percent,
|
||||
_total_gc_waste * HeapWordSize,
|
||||
_max_gc_waste * HeapWordSize,
|
||||
_total_slow_refill_waste * HeapWordSize,
|
||||
_max_slow_refill_waste * HeapWordSize,
|
||||
_total_fast_refill_waste * HeapWordSize,
|
||||
_max_fast_refill_waste * HeapWordSize);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue