Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp @ 6629:c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
Summary: Add the flags G1EvacuationFailureALot flag (and supporting flags) to force trigger evacuation failures. The support flags control how often to trigger an evacuation failure and during which types of evacuation pause. This functionality is analogous to that of PromotionFailureALot for the other collectors.
Reviewed-by: brutisso
author | johnc |
---|---|
date | Tue, 28 Aug 2012 15:20:08 -0700 |
parents | 4f41766176cf |
children | 63a4eb8bcd23 8847586c9037 |
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/* * Copyright (c) 2001, 2010, 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. * */ #include "precompiled.hpp" #include "gc_implementation/g1/concurrentG1Refine.hpp" #include "gc_implementation/g1/concurrentG1RefineThread.hpp" #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" #include "gc_implementation/g1/g1CollectorPolicy.hpp" #include "memory/resourceArea.hpp" #include "runtime/handles.inline.hpp" #include "runtime/mutexLocker.hpp" ConcurrentG1RefineThread:: ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread *next, int worker_id_offset, int worker_id) : ConcurrentGCThread(), _worker_id_offset(worker_id_offset), _worker_id(worker_id), _active(false), _next(next), _monitor(NULL), _cg1r(cg1r), _vtime_accum(0.0) { // Each thread has its own monitor. The i-th thread is responsible for signalling // to thread i+1 if the number of buffers in the queue exceeds a threashold for this // thread. Monitors are also used to wake up the threads during termination. // The 0th worker in notified by mutator threads and has a special monitor. // The last worker is used for young gen rset size sampling. if (worker_id > 0) { _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true); } else { _monitor = DirtyCardQ_CBL_mon; } initialize(); create_and_start(); } void ConcurrentG1RefineThread::initialize() { if (_worker_id < cg1r()->worker_thread_num()) { // Current thread activation threshold _threshold = MIN2<int>(cg1r()->thread_threshold_step() * (_worker_id + 1) + cg1r()->green_zone(), cg1r()->yellow_zone()); // A thread deactivates once the number of buffer reached a deactivation threshold _deactivation_threshold = MAX2<int>(_threshold - cg1r()->thread_threshold_step(), cg1r()->green_zone()); } else { set_active(true); } } void ConcurrentG1RefineThread::sample_young_list_rs_lengths() { G1CollectedHeap* g1h = G1CollectedHeap::heap(); G1CollectorPolicy* g1p = g1h->g1_policy(); if (g1p->adaptive_young_list_length()) { int regions_visited = 0; g1h->young_list()->rs_length_sampling_init(); while (g1h->young_list()->rs_length_sampling_more()) { g1h->young_list()->rs_length_sampling_next(); ++regions_visited; // we try to yield every time we visit 10 regions if (regions_visited == 10) { if (_sts.should_yield()) { _sts.yield("G1 refine"); // we just abandon the iteration break; } regions_visited = 0; } } g1p->revise_young_list_target_length_if_necessary(); } } void ConcurrentG1RefineThread::run_young_rs_sampling() { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); _vtime_start = os::elapsedVTime(); while(!_should_terminate) { _sts.join(); sample_young_list_rs_lengths(); _sts.leave(); if (os::supports_vtime()) { _vtime_accum = (os::elapsedVTime() - _vtime_start); } else { _vtime_accum = 0.0; } MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); if (_should_terminate) { break; } _monitor->wait(Mutex::_no_safepoint_check_flag, G1ConcRefinementServiceIntervalMillis); } } void ConcurrentG1RefineThread::wait_for_completed_buffers() { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); while (!_should_terminate && !is_active()) { _monitor->wait(Mutex::_no_safepoint_check_flag); } } bool ConcurrentG1RefineThread::is_active() { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); return _worker_id > 0 ? _active : dcqs.process_completed_buffers(); } void ConcurrentG1RefineThread::activate() { MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); if (_worker_id > 0) { if (G1TraceConcRefinement) { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); gclog_or_tty->print_cr("G1-Refine-activated worker %d, on threshold %d, current %d", _worker_id, _threshold, (int)dcqs.completed_buffers_num()); } set_active(true); } else { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); dcqs.set_process_completed(true); } _monitor->notify(); } void ConcurrentG1RefineThread::deactivate() { MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); if (_worker_id > 0) { if (G1TraceConcRefinement) { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); gclog_or_tty->print_cr("G1-Refine-deactivated worker %d, off threshold %d, current %d", _worker_id, _deactivation_threshold, (int)dcqs.completed_buffers_num()); } set_active(false); } else { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); dcqs.set_process_completed(false); } } void ConcurrentG1RefineThread::run() { initialize_in_thread(); wait_for_universe_init(); if (_worker_id >= cg1r()->worker_thread_num()) { run_young_rs_sampling(); terminate(); return; } _vtime_start = os::elapsedVTime(); while (!_should_terminate) { DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); // Wait for work wait_for_completed_buffers(); if (_should_terminate) { break; } _sts.join(); do { int curr_buffer_num = (int)dcqs.completed_buffers_num(); // If the number of the buffers falls down into the yellow zone, // that means that the transition period after the evacuation pause has ended. if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cg1r()->yellow_zone()) { dcqs.set_completed_queue_padding(0); } if (_worker_id > 0 && curr_buffer_num <= _deactivation_threshold) { // If the number of the buffer has fallen below our threshold // we should deactivate. The predecessor will reactivate this // thread should the number of the buffers cross the threshold again. deactivate(); break; } // Check if we need to activate the next thread. if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) { _next->activate(); } } while (dcqs.apply_closure_to_completed_buffer(_worker_id + _worker_id_offset, cg1r()->green_zone())); // We can exit the loop above while being active if there was a yield request. if (is_active()) { deactivate(); } _sts.leave(); if (os::supports_vtime()) { _vtime_accum = (os::elapsedVTime() - _vtime_start); } else { _vtime_accum = 0.0; } } assert(_should_terminate, "just checking"); terminate(); } void ConcurrentG1RefineThread::yield() { if (G1TraceConcRefinement) { gclog_or_tty->print_cr("G1-Refine-yield"); } _sts.yield("G1 refine"); if (G1TraceConcRefinement) { gclog_or_tty->print_cr("G1-Refine-yield-end"); } } void ConcurrentG1RefineThread::stop() { // it is ok to take late safepoints here, if needed { MutexLockerEx mu(Terminator_lock); _should_terminate = true; } { MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); _monitor->notify(); } { MutexLockerEx mu(Terminator_lock); while (!_has_terminated) { Terminator_lock->wait(); } } if (G1TraceConcRefinement) { gclog_or_tty->print_cr("G1-Refine-stop"); } } void ConcurrentG1RefineThread::print() const { print_on(tty); } void ConcurrentG1RefineThread::print_on(outputStream* st) const { st->print("\"G1 Concurrent Refinement Thread#%d\" ", _worker_id); Thread::print_on(st); st->cr(); }