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6711316: Open source the Garbage-First garbage collector

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First mercurial integration of the code for the Garbage-First garbage collector.

Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
This commit is contained in:
Y. Srinivas Ramakrishna 2008-06-05 15:57:56 -07:00
parent 39463bb3fc
commit 18f3386a98
215 changed files with 36088 additions and 1249 deletions
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26
hotspot/src/share/vm/memory/referenceProcessor.hpp
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@ -54,6 +54,14 @@ class ReferenceProcessor : public CHeapObj {
bool _discovery_is_atomic; // if discovery is atomic wrt
// other collectors in configuration
bool _discovery_is_mt; // true if reference discovery is MT.
// If true, setting "next" field of a discovered refs list requires
// write barrier(s). (Must be true if used in a collector in which
// elements of a discovered list may be moved during discovery: for
// example, a collector like Garbage-First that moves objects during a
// long-term concurrent marking phase that does weak reference
// discovery.)
bool _discovered_list_needs_barrier;
BarrierSet* _bs; // Cached copy of BarrierSet.
bool _enqueuing_is_done; // true if all weak references enqueued
bool _processing_is_mt; // true during phases when
// reference processing is MT.
@ -196,7 +204,6 @@ class ReferenceProcessor : public CHeapObj {
void verify_ok_to_handle_reflists() PRODUCT_RETURN;
void abandon_partial_discovered_list(DiscoveredList& refs_list);
void abandon_partial_discovered_list_arr(DiscoveredList refs_lists[]);
// Calculate the number of jni handles.
unsigned int count_jni_refs();
@ -217,6 +224,8 @@ class ReferenceProcessor : public CHeapObj {
_discovery_is_atomic(true),
_enqueuing_is_done(false),
_discovery_is_mt(false),
_discovered_list_needs_barrier(false),
_bs(NULL),
_is_alive_non_header(NULL),
_num_q(0),
_processing_is_mt(false),
@ -224,8 +233,10 @@ class ReferenceProcessor : public CHeapObj {
{}
ReferenceProcessor(MemRegion span, bool atomic_discovery,
bool mt_discovery, int mt_degree = 1,
bool mt_processing = false);
bool mt_discovery,
int mt_degree = 1,
bool mt_processing = false,
bool discovered_list_needs_barrier = false);
// Allocates and initializes a reference processor.
static ReferenceProcessor* create_ref_processor(
@ -234,8 +245,8 @@ class ReferenceProcessor : public CHeapObj {
bool mt_discovery,
BoolObjectClosure* is_alive_non_header = NULL,
int parallel_gc_threads = 1,
bool mt_processing = false);
bool mt_processing = false,
bool discovered_list_needs_barrier = false);
// RefDiscoveryPolicy values
enum {
ReferenceBasedDiscovery = 0,
@ -296,6 +307,11 @@ class ReferenceProcessor : public CHeapObj {
// Enqueue references at end of GC (called by the garbage collector)
bool enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor = NULL);
// If a discovery is in process that is being superceded, abandon it: all
// the discovered lists will be empty, and all the objects on them will
// have NULL discovered fields. Must be called only at a safepoint.
void abandon_partial_discovery();
// debugging
void verify_no_references_recorded() PRODUCT_RETURN;
static void verify();