< prev index next > src/hotspot/share/gc/g1/g1FullCollector.cpp
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#include "gc/g1/g1Policy.hpp"
#include "gc/g1/g1RegionMarkStatsCache.inline.hpp"
#include "gc/shared/gcTraceTime.inline.hpp"
#include "gc/shared/preservedMarks.hpp"
#include "gc/shared/referenceProcessor.hpp"
+ #include "gc/shared/slidingForwarding.hpp"
#include "gc/shared/verifyOption.hpp"
#include "gc/shared/weakProcessor.inline.hpp"
#include "gc/shared/workerPolicy.hpp"
#include "logging/log.hpp"
#include "runtime/handles.inline.hpp"
}
void G1FullCollector::phase2_prepare_compaction() {
GCTraceTime(Info, gc, phases) info("Phase 2: Prepare compaction", scope()->timer());
phase2a_determine_worklists();
bool has_free_compaction_targets = phase2b_forward_oops();
// Try to avoid OOM immediately after Full GC in case there are no free regions
// left after determining the result locations (i.e. this phase). Prepare to
// maximally compact the tail regions of the compaction queues serially.
! if (!has_free_compaction_targets) {
! phase2c_prepare_serial_compaction();
! }
}
void G1FullCollector::phase2a_determine_worklists() {
GCTraceTime(Debug, gc, phases) debug("Phase 2: Determine work lists", scope()->timer());
}
void G1FullCollector::phase2_prepare_compaction() {
GCTraceTime(Info, gc, phases) info("Phase 2: Prepare compaction", scope()->timer());
+ _heap->forwarding()->clear();
+
phase2a_determine_worklists();
bool has_free_compaction_targets = phase2b_forward_oops();
// Try to avoid OOM immediately after Full GC in case there are no free regions
// left after determining the result locations (i.e. this phase). Prepare to
// maximally compact the tail regions of the compaction queues serially.
! // TODO: Disabled for now because it violates sliding-forwarding assumption.
! // if (!has_free_compaction_targets) {
! // phase2c_prepare_serial_compaction();
+ // }
}
void G1FullCollector::phase2a_determine_worklists() {
GCTraceTime(Debug, gc, phases) debug("Phase 2: Determine work lists", scope()->timer());
return task.has_free_compaction_targets();
}
void G1FullCollector::phase2c_prepare_serial_compaction() {
! GCTraceTime(Debug, gc, phases) debug("Phase 2: Prepare serial compaction", scope()->timer());
// At this point we know that after parallel compaction there will be no
// completely free regions. That means that the last region of
// all compaction queues still have data in them. We try to compact
// these regions in serial to avoid a premature OOM when the mutator wants
// to allocate the first eden region after gc.
for (uint i = 0; i < workers(); i++) {
G1FullGCCompactionPoint* cp = compaction_point(i);
if (cp->has_regions()) {
serial_compaction_point()->add(cp->remove_last());
}
}
// Update the forwarding information for the regions in the serial
// compaction point.
G1FullGCCompactionPoint* cp = serial_compaction_point();
for (GrowableArrayIterator<HeapRegion*> it = cp->regions()->begin(); it != cp->regions()->end(); ++it) {
HeapRegion* current = *it;
if (!cp->is_initialized()) {
// Initialize the compaction point. Nothing more is needed for the first heap region
return task.has_free_compaction_targets();
}
void G1FullCollector::phase2c_prepare_serial_compaction() {
! ShouldNotReachHere(); // Disabled in Lilliput.
+ //GCTraceTime(Debug, gc, phases) debug("Phase 2: Prepare serial compaction", scope()->timer());
// At this point we know that after parallel compaction there will be no
// completely free regions. That means that the last region of
// all compaction queues still have data in them. We try to compact
// these regions in serial to avoid a premature OOM when the mutator wants
// to allocate the first eden region after gc.
+ /*
for (uint i = 0; i < workers(); i++) {
G1FullGCCompactionPoint* cp = compaction_point(i);
if (cp->has_regions()) {
serial_compaction_point()->add(cp->remove_last());
}
}
+ */
// Update the forwarding information for the regions in the serial
// compaction point.
+ /*
G1FullGCCompactionPoint* cp = serial_compaction_point();
for (GrowableArrayIterator<HeapRegion*> it = cp->regions()->begin(); it != cp->regions()->end(); ++it) {
HeapRegion* current = *it;
if (!cp->is_initialized()) {
// Initialize the compaction point. Nothing more is needed for the first heap region
set_compaction_top(current, current->bottom());
current->apply_to_marked_objects(mark_bitmap(), &re_prepare);
}
}
cp->update();
+ */
}
void G1FullCollector::phase3_adjust_pointers() {
// Adjust the pointers to reflect the new locations
GCTraceTime(Info, gc, phases) info("Phase 3: Adjust pointers", scope()->timer());
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