Mercurial > hg > graal-compiler
view src/share/vm/memory/permGen.cpp @ 1438:a7a0ef3c6858
Added timing printout on VM shutdown.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Mon, 25 Oct 2010 18:35:34 +0200 |
parents | 0fbdb4381b99 |
children | c18cbe5936b8 |
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/* * Copyright 2000-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #include "incls/_precompiled.incl" #include "incls/_permGen.cpp.incl" HeapWord* PermGen::mem_allocate_in_gen(size_t size, Generation* gen) { GCCause::Cause next_cause = GCCause::_permanent_generation_full; GCCause::Cause prev_cause = GCCause::_no_gc; unsigned int gc_count_before, full_gc_count_before; HeapWord* obj; for (;;) { { MutexLocker ml(Heap_lock); if ((obj = gen->allocate(size, false)) != NULL) { return obj; } if (gen->capacity() < _capacity_expansion_limit || prev_cause != GCCause::_no_gc) { obj = gen->expand_and_allocate(size, false); } if (obj != NULL || prev_cause == GCCause::_last_ditch_collection) { return obj; } if (GC_locker::is_active_and_needs_gc()) { // If this thread is not in a jni critical section, we stall // the requestor until the critical section has cleared and // GC allowed. When the critical section clears, a GC is // initiated by the last thread exiting the critical section; so // we retry the allocation sequence from the beginning of the loop, // rather than causing more, now probably unnecessary, GC attempts. JavaThread* jthr = JavaThread::current(); if (!jthr->in_critical()) { MutexUnlocker mul(Heap_lock); // Wait for JNI critical section to be exited GC_locker::stall_until_clear(); continue; } else { if (CheckJNICalls) { fatal("Possible deadlock due to allocating while" " in jni critical section"); } return NULL; } } // Read the GC count while holding the Heap_lock gc_count_before = SharedHeap::heap()->total_collections(); full_gc_count_before = SharedHeap::heap()->total_full_collections(); } // Give up heap lock above, VMThread::execute below gets it back VM_GenCollectForPermanentAllocation op(size, gc_count_before, full_gc_count_before, next_cause); VMThread::execute(&op); if (!op.prologue_succeeded() || op.gc_locked()) { assert(op.result() == NULL, "must be NULL if gc_locked() is true"); continue; // retry and/or stall as necessary } obj = op.result(); assert(obj == NULL || SharedHeap::heap()->is_in_reserved(obj), "result not in heap"); if (obj != NULL) { return obj; } prev_cause = next_cause; next_cause = GCCause::_last_ditch_collection; } } CompactingPermGen::CompactingPermGen(ReservedSpace rs, ReservedSpace shared_rs, size_t initial_byte_size, GenRemSet* remset, PermanentGenerationSpec* perm_spec) { CompactingPermGenGen* g = new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset, NULL, perm_spec); if (g == NULL) vm_exit_during_initialization("Could not allocate a CompactingPermGen"); _gen = g; g->initialize_performance_counters(); _capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion; } HeapWord* CompactingPermGen::mem_allocate(size_t size) { return mem_allocate_in_gen(size, _gen); } void CompactingPermGen::compute_new_size() { size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion); if (desired_capacity < PermSize) { desired_capacity = PermSize; } if (_gen->capacity() > desired_capacity) { _gen->shrink(_gen->capacity() - desired_capacity); } _capacity_expansion_limit = _gen->capacity() + MaxPermHeapExpansion; }