Mercurial > hg > truffle
view src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 3456:782e2bb60c41
7052494: Eclipse test fails on JDK 7 b142
Summary: Keep 'ne' test in Counted loop when we can't guarantee during compilation that init < limit.
Reviewed-by: never
author | kvn |
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date | Mon, 20 Jun 2011 16:45:35 -0700 |
parents | 1d1603768966 |
children | 5130fa1b24f1 |
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/* * Copyright (c) 2001, 2011, 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/g1CollectedHeap.inline.hpp" #include "gc_implementation/g1/g1CollectorPolicy.hpp" #include "gc_implementation/g1/vm_operations_g1.hpp" #include "gc_implementation/shared/isGCActiveMark.hpp" #include "gc_implementation/g1/vm_operations_g1.hpp" #include "runtime/interfaceSupport.hpp" VM_G1CollectForAllocation::VM_G1CollectForAllocation( unsigned int gc_count_before, size_t word_size) : VM_G1OperationWithAllocRequest(gc_count_before, word_size) { guarantee(word_size > 0, "an allocation should always be requested"); } void VM_G1CollectForAllocation::doit() { G1CollectedHeap* g1h = G1CollectedHeap::heap(); _result = g1h->satisfy_failed_allocation(_word_size, &_pause_succeeded); assert(_result == NULL || _pause_succeeded, "if we get back a result, the pause should have succeeded"); } void VM_G1CollectFull::doit() { G1CollectedHeap* g1h = G1CollectedHeap::heap(); GCCauseSetter x(g1h, _gc_cause); g1h->do_full_collection(false /* clear_all_soft_refs */); } VM_G1IncCollectionPause::VM_G1IncCollectionPause( unsigned int gc_count_before, size_t word_size, bool should_initiate_conc_mark, double target_pause_time_ms, GCCause::Cause gc_cause) : VM_G1OperationWithAllocRequest(gc_count_before, word_size), _should_initiate_conc_mark(should_initiate_conc_mark), _target_pause_time_ms(target_pause_time_ms), _full_collections_completed_before(0) { guarantee(target_pause_time_ms > 0.0, err_msg("target_pause_time_ms = %1.6lf should be positive", target_pause_time_ms)); guarantee(word_size == 0 || gc_cause == GCCause::_g1_inc_collection_pause, "we can only request an allocation if the GC cause is for " "an incremental GC pause"); _gc_cause = gc_cause; } void VM_G1IncCollectionPause::doit() { G1CollectedHeap* g1h = G1CollectedHeap::heap(); assert(!_should_initiate_conc_mark || ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)), "only a GC locker or a System.gc() induced GC should start a cycle"); if (_word_size > 0) { // An allocation has been requested. So, try to do that first. _result = g1h->attempt_allocation_at_safepoint(_word_size, false /* expect_null_cur_alloc_region */); if (_result != NULL) { // If we can successfully allocate before we actually do the // pause then we will consider this pause successful. _pause_succeeded = true; return; } } GCCauseSetter x(g1h, _gc_cause); if (_should_initiate_conc_mark) { // It's safer to read full_collections_completed() here, given // that noone else will be updating it concurrently. Since we'll // only need it if we're initiating a marking cycle, no point in // setting it earlier. _full_collections_completed_before = g1h->full_collections_completed(); // At this point we are supposed to start a concurrent cycle. We // will do so if one is not already in progress. bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(); } _pause_succeeded = g1h->do_collection_pause_at_safepoint(_target_pause_time_ms); if (_pause_succeeded && _word_size > 0) { // An allocation had been requested. _result = g1h->attempt_allocation_at_safepoint(_word_size, true /* expect_null_cur_alloc_region */); } else { assert(_result == NULL, "invariant"); } } void VM_G1IncCollectionPause::doit_epilogue() { VM_GC_Operation::doit_epilogue(); // If the pause was initiated by a System.gc() and // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle // that just started (or maybe one that was already in progress) to // finish. if (_gc_cause == GCCause::_java_lang_system_gc && _should_initiate_conc_mark) { assert(ExplicitGCInvokesConcurrent, "the only way to be here is if ExplicitGCInvokesConcurrent is set"); G1CollectedHeap* g1h = G1CollectedHeap::heap(); // In the doit() method we saved g1h->full_collections_completed() // in the _full_collections_completed_before field. We have to // wait until we observe that g1h->full_collections_completed() // has increased by at least one. This can happen if a) we started // a cycle and it completes, b) a cycle already in progress // completes, or c) a Full GC happens. // If the condition has already been reached, there's no point in // actually taking the lock and doing the wait. if (g1h->full_collections_completed() <= _full_collections_completed_before) { // The following is largely copied from CMS Thread* thr = Thread::current(); assert(thr->is_Java_thread(), "invariant"); JavaThread* jt = (JavaThread*)thr; ThreadToNativeFromVM native(jt); MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); while (g1h->full_collections_completed() <= _full_collections_completed_before) { FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); } } } } void VM_CGC_Operation::doit() { gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty); SharedHeap* sh = SharedHeap::heap(); // This could go away if CollectedHeap gave access to _gc_is_active... if (sh != NULL) { IsGCActiveMark x; _cl->do_void(); } else { _cl->do_void(); } } bool VM_CGC_Operation::doit_prologue() { Heap_lock->lock(); SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true; return true; } void VM_CGC_Operation::doit_epilogue() { SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false; Heap_lock->unlock(); }