--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1Allocator.cpp Fri Sep 05 09:49:19 2014 +0200
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2014, 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/g1Allocator.hpp"
+#include "gc_implementation/g1/g1CollectedHeap.hpp"
+#include "gc_implementation/g1/g1CollectorPolicy.hpp"
+#include "gc_implementation/g1/heapRegion.inline.hpp"
+#include "gc_implementation/g1/heapRegionSet.inline.hpp"
+
+void G1DefaultAllocator::init_mutator_alloc_region() {
+ assert(_mutator_alloc_region.get() == NULL, "pre-condition");
+ _mutator_alloc_region.init();
+}
+
+void G1DefaultAllocator::release_mutator_alloc_region() {
+ _mutator_alloc_region.release();
+ assert(_mutator_alloc_region.get() == NULL, "post-condition");
+}
+
+void G1Allocator::reuse_retained_old_region(EvacuationInfo& evacuation_info,
+ OldGCAllocRegion* old,
+ HeapRegion** retained_old) {
+ HeapRegion* retained_region = *retained_old;
+ *retained_old = NULL;
+
+ // We will discard the current GC alloc region if:
+ // a) it's in the collection set (it can happen!),
+ // b) it's already full (no point in using it),
+ // c) it's empty (this means that it was emptied during
+ // a cleanup and it should be on the free list now), or
+ // d) it's humongous (this means that it was emptied
+ // during a cleanup and was added to the free list, but
+ // has been subsequently used to allocate a humongous
+ // object that may be less than the region size).
+ if (retained_region != NULL &&
+ !retained_region->in_collection_set() &&
+ !(retained_region->top() == retained_region->end()) &&
+ !retained_region->is_empty() &&
+ !retained_region->isHumongous()) {
+ retained_region->record_top_and_timestamp();
+ // The retained region was added to the old region set when it was
+ // retired. We have to remove it now, since we don't allow regions
+ // we allocate to in the region sets. We'll re-add it later, when
+ // it's retired again.
+ _g1h->_old_set.remove(retained_region);
+ bool during_im = _g1h->g1_policy()->during_initial_mark_pause();
+ retained_region->note_start_of_copying(during_im);
+ old->set(retained_region);
+ _g1h->_hr_printer.reuse(retained_region);
+ evacuation_info.set_alloc_regions_used_before(retained_region->used());
+ }
+}
+
+void G1DefaultAllocator::init_gc_alloc_regions(EvacuationInfo& evacuation_info) {
+ assert_at_safepoint(true /* should_be_vm_thread */);
+
+ _survivor_gc_alloc_region.init();
+ _old_gc_alloc_region.init();
+ reuse_retained_old_region(evacuation_info,
+ &_old_gc_alloc_region,
+ &_retained_old_gc_alloc_region);
+}
+
+void G1DefaultAllocator::release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) {
+ AllocationContext_t context = AllocationContext::current();
+ evacuation_info.set_allocation_regions(survivor_gc_alloc_region(context)->count() +
+ old_gc_alloc_region(context)->count());
+ survivor_gc_alloc_region(context)->release();
+ // If we have an old GC alloc region to release, we'll save it in
+ // _retained_old_gc_alloc_region. If we don't
+ // _retained_old_gc_alloc_region will become NULL. This is what we
+ // want either way so no reason to check explicitly for either
+ // condition.
+ _retained_old_gc_alloc_region = old_gc_alloc_region(context)->release();
+
+ if (ResizePLAB) {
+ _g1h->_survivor_plab_stats.adjust_desired_plab_sz(no_of_gc_workers);
+ _g1h->_old_plab_stats.adjust_desired_plab_sz(no_of_gc_workers);
+ }
+}
+
+void G1DefaultAllocator::abandon_gc_alloc_regions() {
+ assert(survivor_gc_alloc_region(AllocationContext::current())->get() == NULL, "pre-condition");
+ assert(old_gc_alloc_region(AllocationContext::current())->get() == NULL, "pre-condition");
+ _retained_old_gc_alloc_region = NULL;
+}
+
+G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) :
+ ParGCAllocBuffer(gclab_word_size), _retired(true) { }
+
+HeapWord* G1ParGCAllocator::allocate_slow(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context) {
+ HeapWord* obj = NULL;
+ size_t gclab_word_size = _g1h->desired_plab_sz(purpose);
+ if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) {
+ G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose, context);
+ add_to_alloc_buffer_waste(alloc_buf->words_remaining());
+ alloc_buf->retire(false /* end_of_gc */, false /* retain */);
+
+ HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size, context);
+ if (buf == NULL) {
+ return NULL; // Let caller handle allocation failure.
+ }
+ // Otherwise.
+ alloc_buf->set_word_size(gclab_word_size);
+ alloc_buf->set_buf(buf);
+
+ obj = alloc_buf->allocate(word_sz);
+ assert(obj != NULL, "buffer was definitely big enough...");
+ } else {
+ obj = _g1h->par_allocate_during_gc(purpose, word_sz, context);
+ }
+ return obj;
+}
+
+G1DefaultParGCAllocator::G1DefaultParGCAllocator(G1CollectedHeap* g1h) :
+ G1ParGCAllocator(g1h),
+ _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)),
+ _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)) {
+
+ _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer;
+ _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer;
+
+}
+
+void G1DefaultParGCAllocator::retire_alloc_buffers() {
+ for (int ap = 0; ap < GCAllocPurposeCount; ++ap) {
+ size_t waste = _alloc_buffers[ap]->words_remaining();
+ add_to_alloc_buffer_waste(waste);
+ _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap),
+ true /* end_of_gc */,
+ false /* retain */);
+ }
+}