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提交 fda06608 编写于 作者: J johnc
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上级 797f0649 0ed267ef
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src/cpu/x86/vm/globals_x86.hpp
浏览文件 @ fda06608
......@@ -62,7 +62,7 @@ define_pd_global(intx, StackRedPages, 1);
// due to lack of optimization caused by C++ compiler bugs
define_pd_global(intx, StackShadowPages, SOLARIS_ONLY(20) NOT_SOLARIS(6) DEBUG_ONLY(+2));
#else
define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+5));
#endif // AMD64
define_pd_global(intx, PreInflateSpin, 10);
......
src/share/vm/gc_implementation/g1/concurrentMark.cpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -458,6 +458,7 @@ ConcurrentMark::ConcurrentMark(ReservedSpace rs,
_marking_task_overhead(1.0),
_cleanup_sleep_factor(0.0),
_cleanup_task_overhead(1.0),
_cleanup_list("Cleanup List"),
_region_bm(max_regions, false /* in_resource_area*/),
_card_bm((rs.size() + CardTableModRefBS::card_size - 1) >>
CardTableModRefBS::card_shift,
......@@ -521,12 +522,6 @@ ConcurrentMark::ConcurrentMark(ReservedSpace rs,
SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set();
satb_qs.set_buffer_size(G1SATBBufferSize);
int size = (int) MAX2(ParallelGCThreads, (size_t)1);
_par_cleanup_thread_state = NEW_C_HEAP_ARRAY(ParCleanupThreadState*, size);
for (int i = 0 ; i < size; i++) {
_par_cleanup_thread_state[i] = new ParCleanupThreadState;
}
_tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num);
_accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num);
......@@ -711,11 +706,6 @@ void ConcurrentMark::set_non_marking_state() {
}
ConcurrentMark::~ConcurrentMark() {
int size = (int) MAX2(ParallelGCThreads, (size_t)1);
for (int i = 0; i < size; i++) delete _par_cleanup_thread_state[i];
FREE_C_HEAP_ARRAY(ParCleanupThreadState*,
_par_cleanup_thread_state);
for (int i = 0; i < (int) _max_task_num; ++i) {
delete _task_queues->queue(i);
delete _tasks[i];
......@@ -1171,11 +1161,11 @@ void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) {
if (G1TraceMarkStackOverflow)
gclog_or_tty->print_cr("\nRemark led to restart for overflow.");
} else {
SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set();
// We're done with marking.
// This is the end of the marking cycle, we're expected all
// threads to have SATB queues with active set to true.
JavaThread::satb_mark_queue_set().set_active_all_threads(
false, /* new active value */
satb_mq_set.set_active_all_threads(false, /* new active value */
true /* expected_active */);
if (VerifyDuringGC) {
......@@ -1510,21 +1500,20 @@ class G1NoteEndOfConcMarkClosure : public HeapRegionClosure {
size_t _max_live_bytes;
size_t _regions_claimed;
size_t _freed_bytes;
size_t _cleared_h_regions;
size_t _freed_regions;
UncleanRegionList* _unclean_region_list;
FreeRegionList _local_cleanup_list;
HumongousRegionSet _humongous_proxy_set;
double _claimed_region_time;
double _max_region_time;
public:
G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1,
UncleanRegionList* list,
int worker_num);
size_t freed_bytes() { return _freed_bytes; }
size_t cleared_h_regions() { return _cleared_h_regions; }
size_t freed_regions() { return _freed_regions; }
UncleanRegionList* unclean_region_list() {
return _unclean_region_list;
FreeRegionList* local_cleanup_list() {
return &_local_cleanup_list;
}
HumongousRegionSet* humongous_proxy_set() {
return &_humongous_proxy_set;
}
bool doHeapRegion(HeapRegion *r);
......@@ -1537,25 +1526,22 @@ public:
class G1ParNoteEndTask: public AbstractGangTask {
friend class G1NoteEndOfConcMarkClosure;
protected:
G1CollectedHeap* _g1h;
size_t _max_live_bytes;
size_t _freed_bytes;
ConcurrentMark::ParCleanupThreadState** _par_cleanup_thread_state;
FreeRegionList* _cleanup_list;
public:
G1ParNoteEndTask(G1CollectedHeap* g1h,
ConcurrentMark::ParCleanupThreadState**
par_cleanup_thread_state) :
FreeRegionList* cleanup_list) :
AbstractGangTask("G1 note end"), _g1h(g1h),
_max_live_bytes(0), _freed_bytes(0),
_par_cleanup_thread_state(par_cleanup_thread_state)
{}
_max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { }
void work(int i) {
double start = os::elapsedTime();
G1NoteEndOfConcMarkClosure g1_note_end(_g1h,
&_par_cleanup_thread_state[i]->list,
i);
G1NoteEndOfConcMarkClosure g1_note_end(_g1h, i);
if (G1CollectedHeap::use_parallel_gc_threads()) {
_g1h->heap_region_par_iterate_chunked(&g1_note_end, i,
HeapRegion::NoteEndClaimValue);
......@@ -1564,14 +1550,18 @@ public:
}
assert(g1_note_end.complete(), "Shouldn't have yielded!");
// Now finish up freeing the current thread's regions.
_g1h->finish_free_region_work(g1_note_end.freed_bytes(),
g1_note_end.cleared_h_regions(),
0, NULL);
// Now update the lists
_g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(),
NULL /* free_list */,
g1_note_end.humongous_proxy_set(),
true /* par */);
{
MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag);
_max_live_bytes += g1_note_end.max_live_bytes();
_freed_bytes += g1_note_end.freed_bytes();
_cleanup_list->add_as_tail(g1_note_end.local_cleanup_list());
assert(g1_note_end.local_cleanup_list()->is_empty(), "post-condition");
}
double end = os::elapsedTime();
if (G1PrintParCleanupStats) {
......@@ -1612,30 +1602,28 @@ public:
G1NoteEndOfConcMarkClosure::
G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1,
UncleanRegionList* list,
int worker_num)
: _g1(g1), _worker_num(worker_num),
_max_live_bytes(0), _regions_claimed(0),
_freed_bytes(0), _cleared_h_regions(0), _freed_regions(0),
_freed_bytes(0),
_claimed_region_time(0.0), _max_region_time(0.0),
_unclean_region_list(list)
{}
_local_cleanup_list("Local Cleanup List"),
_humongous_proxy_set("Local Cleanup Humongous Proxy Set") { }
bool G1NoteEndOfConcMarkClosure::doHeapRegion(HeapRegion *r) {
bool G1NoteEndOfConcMarkClosure::doHeapRegion(HeapRegion *hr) {
// We use a claim value of zero here because all regions
// were claimed with value 1 in the FinalCount task.
r->reset_gc_time_stamp();
if (!r->continuesHumongous()) {
hr->reset_gc_time_stamp();
if (!hr->continuesHumongous()) {
double start = os::elapsedTime();
_regions_claimed++;
r->note_end_of_marking();
_max_live_bytes += r->max_live_bytes();
_g1->free_region_if_totally_empty_work(r,
_freed_bytes,
_cleared_h_regions,
_freed_regions,
_unclean_region_list,
true /*par*/);
hr->note_end_of_marking();
_max_live_bytes += hr->max_live_bytes();
_g1->free_region_if_totally_empty(hr,
&_freed_bytes,
&_local_cleanup_list,
&_humongous_proxy_set,
true /* par */);
double region_time = (os::elapsedTime() - start);
_claimed_region_time += region_time;
if (region_time > _max_region_time) _max_region_time = region_time;
......@@ -1655,6 +1643,8 @@ void ConcurrentMark::cleanup() {
return;
}
g1h->verify_region_sets_optional();
if (VerifyDuringGC) {
HandleMark hm; // handle scope
gclog_or_tty->print(" VerifyDuringGC:(before)");
......@@ -1719,7 +1709,7 @@ void ConcurrentMark::cleanup() {
// Note end of marking in all heap regions.
double note_end_start = os::elapsedTime();
G1ParNoteEndTask g1_par_note_end_task(g1h, _par_cleanup_thread_state);
G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list);
if (G1CollectedHeap::use_parallel_gc_threads()) {
int n_workers = g1h->workers()->total_workers();
g1h->set_par_threads(n_workers);
......@@ -1731,9 +1721,14 @@ void ConcurrentMark::cleanup() {
} else {
g1_par_note_end_task.work(0);
}
g1h->set_unclean_regions_coming(true);
if (!cleanup_list_is_empty()) {
// The cleanup list is not empty, so we'll have to process it
// concurrently. Notify anyone else that might be wanting free
// regions that there will be more free regions coming soon.
g1h->set_free_regions_coming();
}
double note_end_end = os::elapsedTime();
// Tell the mutators that there might be unclean regions coming...
if (G1PrintParCleanupStats) {
gclog_or_tty->print_cr(" note end of marking: %8.3f ms.",
(note_end_end - note_end_start)*1000.0);
......@@ -1799,33 +1794,63 @@ void ConcurrentMark::cleanup() {
/* silent */ false,
/* prev marking */ true);
}
g1h->verify_region_sets_optional();
}
void ConcurrentMark::completeCleanup() {
// A full collection intervened.
if (has_aborted()) return;
int first = 0;
int last = (int)MAX2(ParallelGCThreads, (size_t)1);
for (int t = 0; t < last; t++) {
UncleanRegionList* list = &_par_cleanup_thread_state[t]->list;
assert(list->well_formed(), "Inv");
HeapRegion* hd = list->hd();
while (hd != NULL) {
// Now finish up the other stuff.
hd->rem_set()->clear();
HeapRegion* next_hd = hd->next_from_unclean_list();
(void)list->pop();
assert(list->hd() == next_hd, "how not?");
_g1h->put_region_on_unclean_list(hd);
if (!hd->isHumongous()) {
// Add this to the _free_regions count by 1.
_g1h->finish_free_region_work(0, 0, 1, NULL);
}
hd = list->hd();
assert(hd == next_hd, "how not?");
G1CollectedHeap* g1h = G1CollectedHeap::heap();
_cleanup_list.verify_optional();
FreeRegionList local_free_list("Local Cleanup List");
if (G1ConcRegionFreeingVerbose) {
gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : "
"cleanup list has "SIZE_FORMAT" entries",
_cleanup_list.length());
}
// Noone else should be accessing the _cleanup_list at this point,
// so it's not necessary to take any locks
while (!_cleanup_list.is_empty()) {
HeapRegion* hr = _cleanup_list.remove_head();
assert(hr != NULL, "the list was not empty");
hr->rem_set()->clear();
local_free_list.add_as_tail(hr);
// Instead of adding one region at a time to the secondary_free_list,
// we accumulate them in the local list and move them a few at a
// time. This also cuts down on the number of notify_all() calls
// we do during this process. We'll also append the local list when
// _cleanup_list is empty (which means we just removed the last
// region from the _cleanup_list).
if ((local_free_list.length() % G1SecondaryFreeListAppendLength == 0) ||
_cleanup_list.is_empty()) {
if (G1ConcRegionFreeingVerbose) {
gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : "
"appending "SIZE_FORMAT" entries to the "
"secondary_free_list, clean list still has "
SIZE_FORMAT" entries",
local_free_list.length(),
_cleanup_list.length());
}
{
MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag);
g1h->secondary_free_list_add_as_tail(&local_free_list);
SecondaryFreeList_lock->notify_all();
}
if (G1StressConcRegionFreeing) {
for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) {
os::sleep(Thread::current(), (jlong) 1, false);
}
}
}
}
assert(local_free_list.is_empty(), "post-condition");
}
bool G1CMIsAliveClosure::do_object_b(oop obj) {
......@@ -2897,9 +2922,9 @@ public:
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
assert(_g1h->is_in_g1_reserved((HeapWord*) p), "invariant");
assert(!_g1h->heap_region_containing((HeapWord*) p)->is_on_free_list(),
"invariant");
assert( _g1h->is_in_g1_reserved((HeapWord*) p), "invariant");
assert(!_g1h->is_on_free_list(
_g1h->heap_region_containing((HeapWord*) p)), "invariant");
oop obj = oopDesc::load_decode_heap_oop(p);
if (_cm->verbose_high())
......@@ -3119,8 +3144,8 @@ void CMTask::deal_with_reference(oop obj) {
void CMTask::push(oop obj) {
HeapWord* objAddr = (HeapWord*) obj;
assert(_g1h->is_in_g1_reserved(objAddr), "invariant");
assert(!_g1h->heap_region_containing(objAddr)->is_on_free_list(),
"invariant");
assert(!_g1h->is_on_free_list(
_g1h->heap_region_containing((HeapWord*) objAddr)), "invariant");
assert(!_g1h->is_obj_ill(obj), "invariant");
assert(_nextMarkBitMap->isMarked(objAddr), "invariant");
......@@ -3365,8 +3390,8 @@ void CMTask::drain_local_queue(bool partially) {
(void*) obj);
assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" );
assert(!_g1h->heap_region_containing(obj)->is_on_free_list(),
"invariant");
assert(!_g1h->is_on_free_list(
_g1h->heap_region_containing((HeapWord*) obj)), "invariant");
scan_object(obj);
......
src/share/vm/gc_implementation/g1/concurrentMark.hpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -25,7 +25,7 @@
#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP
#include "gc_implementation/g1/heapRegion.hpp"
#include "gc_implementation/g1/heapRegionSets.hpp"
#include "utilities/taskqueue.hpp"
class G1CollectedHeap;
......@@ -369,13 +369,7 @@ protected:
double _cleanup_sleep_factor;
double _cleanup_task_overhead;
// Stuff related to age cohort processing.
struct ParCleanupThreadState {
char _pre[64];
UncleanRegionList list;
char _post[64];
};
ParCleanupThreadState** _par_cleanup_thread_state;
FreeRegionList _cleanup_list;
// CMS marking support structures
CMBitMap _markBitMap1;
......@@ -484,6 +478,10 @@ protected:
// prints all gathered CM-related statistics
void print_stats();
bool cleanup_list_is_empty() {
return _cleanup_list.is_empty();
}
// accessor methods
size_t parallel_marking_threads() { return _parallel_marking_threads; }
double sleep_factor() { return _sleep_factor; }
......
src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -95,8 +95,8 @@ void ConcurrentMarkThread::run() {
_vtime_start = os::elapsedVTime();
wait_for_universe_init();
G1CollectedHeap* g1 = G1CollectedHeap::heap();
G1CollectorPolicy* g1_policy = g1->g1_policy();
G1CollectedHeap* g1h = G1CollectedHeap::heap();
G1CollectorPolicy* g1_policy = g1h->g1_policy();
G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker();
Thread *current_thread = Thread::current();
......@@ -119,7 +119,7 @@ void ConcurrentMarkThread::run() {
if (!g1_policy->in_young_gc_mode()) {
// this ensures the flag is not set if we bail out of the marking
// cycle; normally the flag is cleared immediately after cleanup
g1->set_marking_complete();
g1h->set_marking_complete();
if (g1_policy->adaptive_young_list_length()) {
double now = os::elapsedTime();
......@@ -228,10 +228,20 @@ void ConcurrentMarkThread::run() {
VM_CGC_Operation op(&cl_cl, verbose_str);
VMThread::execute(&op);
} else {
G1CollectedHeap::heap()->set_marking_complete();
g1h->set_marking_complete();
}
if (!cm()->has_aborted()) {
// Check if cleanup set the free_regions_coming flag. If it
// hasn't, we can just skip the next step.
if (g1h->free_regions_coming()) {
// The following will finish freeing up any regions that we
// found to be empty during cleanup. We'll do this part
// without joining the suspendible set. If an evacuation pause
// takes places, then we would carry on freeing regions in
// case they are needed by the pause. If a Full GC takes
// places, it would wait for us to process the regions
// reclaimed by cleanup.
double cleanup_start_sec = os::elapsedTime();
if (PrintGC) {
gclog_or_tty->date_stamp(PrintGCDateStamps);
......@@ -240,9 +250,7 @@ void ConcurrentMarkThread::run() {
}
// Now do the remainder of the cleanup operation.
_sts.join();
_cm->completeCleanup();
if (!cm()->has_aborted()) {
g1_policy->record_concurrent_mark_cleanup_completed();
double cleanup_end_sec = os::elapsedTime();
......@@ -252,11 +260,12 @@ void ConcurrentMarkThread::run() {
gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]",
cleanup_end_sec - cleanup_start_sec);
}
// We're done: no more free regions coming.
g1h->reset_free_regions_coming();
}
_sts.leave();
}
// We're done: no more unclean regions coming.
G1CollectedHeap::heap()->set_unclean_regions_coming(false);
guarantee(cm()->cleanup_list_is_empty(),
"at this point there should be no regions on the cleanup list");
if (cm()->has_aborted()) {
if (PrintGC) {
......@@ -278,7 +287,7 @@ void ConcurrentMarkThread::run() {
// Java thread is waiting for a full GC to happen (e.g., it
// called System.gc() with +ExplicitGCInvokesConcurrent).
_sts.join();
g1->increment_full_collections_completed(true /* concurrent */);
g1h->increment_full_collections_completed(true /* concurrent */);
_sts.leave();
}
assert(_should_terminate, "just checking");
......
src/share/vm/gc_implementation/g1/concurrentZFThread.cpp 已删除 100644 → 0
浏览文件 @ 797f0649
/*
* Copyright (c) 2001, 2010, 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/concurrentZFThread.hpp"
#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
#include "gc_implementation/g1/heapRegion.hpp"
#include "memory/space.inline.hpp"
#include "runtime/mutexLocker.hpp"
#include "utilities/copy.hpp"
// ======= Concurrent Zero-Fill Thread ========
// The CM thread is created when the G1 garbage collector is used
int ConcurrentZFThread::_region_allocs = 0;
int ConcurrentZFThread::_sync_zfs = 0;
int ConcurrentZFThread::_zf_waits = 0;
int ConcurrentZFThread::_regions_filled = 0;
ConcurrentZFThread::ConcurrentZFThread() :
ConcurrentGCThread()
{
create_and_start();
}
void ConcurrentZFThread::wait_for_ZF_completed(HeapRegion* hr) {
assert(ZF_mon->owned_by_self(), "Precondition.");
note_zf_wait();
while (hr->zero_fill_state() == HeapRegion::ZeroFilling) {
ZF_mon->wait(Mutex::_no_safepoint_check_flag);
}
}
void ConcurrentZFThread::processHeapRegion(HeapRegion* hr) {
assert(!Universe::heap()->is_gc_active(),
"This should not happen during GC.");
assert(hr != NULL, "Precondition");
// These are unlocked reads, but if this test is successful, then no
// other thread will attempt this zero filling. Only a GC thread can
// modify the ZF state of a region whose state is zero-filling, and this
// should only happen while the ZF thread is locking out GC.
if (hr->zero_fill_state() == HeapRegion::ZeroFilling
&& hr->zero_filler() == Thread::current()) {
assert(hr->top() == hr->bottom(), "better be empty!");
assert(!hr->isHumongous(), "Only free regions on unclean list.");
Copy::fill_to_words(hr->bottom(), hr->capacity()/HeapWordSize);
note_region_filled();
}
}
void ConcurrentZFThread::run() {
initialize_in_thread();
Thread* thr_self = Thread::current();
_vtime_start = os::elapsedVTime();
wait_for_universe_init();
G1CollectedHeap* g1 = G1CollectedHeap::heap();
_sts.join();
while (!_should_terminate) {
_sts.leave();
{
MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag);
// This local variable will hold a region being zero-filled. This
// region will neither be on the unclean or zero-filled lists, and
// will not be available for allocation; thus, we might have an
// allocation fail, causing a full GC, because of this, but this is a
// price we will pay. (In future, we might want to make the fact
// that there's a region being zero-filled apparent to the G1 heap,
// which could then wait for it in this extreme case...)
HeapRegion* to_fill;
while (!g1->should_zf()
|| (to_fill = g1->pop_unclean_region_list_locked()) == NULL)
ZF_mon->wait(Mutex::_no_safepoint_check_flag);
while (to_fill->zero_fill_state() == HeapRegion::ZeroFilling)
ZF_mon->wait(Mutex::_no_safepoint_check_flag);
// So now to_fill is non-NULL and is not ZeroFilling. It might be
// Allocated or ZeroFilled. (The latter could happen if this thread
// starts the zero-filling of a region, but a GC intervenes and
// pushes new regions needing on the front of the filling on the
// front of the list.)
switch (to_fill->zero_fill_state()) {
case HeapRegion::Allocated:
to_fill = NULL;
break;
case HeapRegion::NotZeroFilled:
to_fill->set_zero_fill_in_progress(thr_self);
ZF_mon->unlock();
_sts.join();
processHeapRegion(to_fill);
_sts.leave();
ZF_mon->lock_without_safepoint_check();
if (to_fill->zero_fill_state() == HeapRegion::ZeroFilling
&& to_fill->zero_filler() == thr_self) {
to_fill->set_zero_fill_complete();
(void)g1->put_free_region_on_list_locked(to_fill);
}
break;
case HeapRegion::ZeroFilled:
(void)g1->put_free_region_on_list_locked(to_fill);
break;
case HeapRegion::ZeroFilling:
ShouldNotReachHere();
break;
}
}
_vtime_accum = (os::elapsedVTime() - _vtime_start);
_sts.join();
}
_sts.leave();
assert(_should_terminate, "just checking");
terminate();
}
bool ConcurrentZFThread::offer_yield() {
if (_sts.should_yield()) {
_sts.yield("Concurrent ZF");
return true;
} else {
return false;
}
}
void ConcurrentZFThread::stop() {
// it is ok to take late safepoints here, if needed
MutexLockerEx mu(Terminator_lock);
_should_terminate = true;
while (!_has_terminated) {
Terminator_lock->wait();
}
}
void ConcurrentZFThread::print() const {
print_on(tty);
}
void ConcurrentZFThread::print_on(outputStream* st) const {
st->print("\"G1 Concurrent Zero-Fill Thread\" ");
Thread::print_on(st);
st->cr();
}
double ConcurrentZFThread::_vtime_accum;
void ConcurrentZFThread::print_summary_info() {
gclog_or_tty->print("\nConcurrent Zero-Filling:\n");
gclog_or_tty->print(" Filled %d regions, used %5.2fs.\n",
_regions_filled,
vtime_accum());
gclog_or_tty->print(" Of %d region allocs, %d (%5.2f%%) required sync ZF,\n",
_region_allocs, _sync_zfs,
(_region_allocs > 0 ?
(float)_sync_zfs/(float)_region_allocs*100.0 :
0.0));
gclog_or_tty->print(" and %d (%5.2f%%) required a ZF wait.\n",
_zf_waits,
(_region_allocs > 0 ?
(float)_zf_waits/(float)_region_allocs*100.0 :
0.0));
}
src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
浏览文件 @ fda06608
......@@ -27,7 +27,7 @@
#include "gc_implementation/g1/concurrentMark.hpp"
#include "gc_implementation/g1/g1RemSet.hpp"
#include "gc_implementation/g1/heapRegion.hpp"
#include "gc_implementation/g1/heapRegionSets.hpp"
#include "gc_implementation/parNew/parGCAllocBuffer.hpp"
#include "memory/barrierSet.hpp"
#include "memory/memRegion.hpp"
......@@ -66,8 +66,7 @@ typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion )
enum G1GCThreadGroups {
G1CRGroup = 0,
G1ZFGroup = 1,
G1CMGroup = 2,
G1CLGroup = 3
G1CMGroup = 2
};
enum GCAllocPurpose {
......@@ -155,6 +154,7 @@ class G1CollectedHeap : public SharedHeap {
friend class RefineCardTableEntryClosure;
friend class G1PrepareCompactClosure;
friend class RegionSorter;
friend class RegionResetter;
friend class CountRCClosure;
friend class EvacPopObjClosure;
friend class G1ParCleanupCTTask;
......@@ -178,17 +178,20 @@ private:
// The maximum part of _g1_storage that has ever been committed.
MemRegion _g1_max_committed;
// The number of regions that are completely free.
size_t _free_regions;
// The master free list. It will satisfy all new region allocations.
MasterFreeRegionList _free_list;
// The secondary free list which contains regions that have been
// freed up during the cleanup process. This will be appended to the
// master free list when appropriate.
SecondaryFreeRegionList _secondary_free_list;
// It keeps track of the humongous regions.
MasterHumongousRegionSet _humongous_set;
// The number of regions we could create by expansion.
size_t _expansion_regions;
// Return the number of free regions in the heap (by direct counting.)
size_t count_free_regions();
// Return the number of free regions on the free and unclean lists.
size_t count_free_regions_list();
// The block offset table for the G1 heap.
G1BlockOffsetSharedArray* _bot_shared;
......@@ -196,9 +199,6 @@ private:
// lists, before and after full GC.
void tear_down_region_lists();
void rebuild_region_lists();
// This sets all non-empty regions to need zero-fill (which they will if
// they are empty after full collection.)
void set_used_regions_to_need_zero_fill();
// The sequence of all heap regions in the heap.
HeapRegionSeq* _hrs;
......@@ -231,7 +231,7 @@ private:
// Determines PLAB size for a particular allocation purpose.
static size_t desired_plab_sz(GCAllocPurpose purpose);
// When called by par thread, require par_alloc_during_gc_lock() to be held.
// When called by par thread, requires the FreeList_lock to be held.
void push_gc_alloc_region(HeapRegion* hr);
// This should only be called single-threaded. Undeclares all GC alloc
......@@ -294,10 +294,11 @@ private:
// line number, file, etc.
#define heap_locking_asserts_err_msg(__extra_message) \
err_msg("%s : Heap_lock %slocked, %sat a safepoint", \
err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \
(__extra_message), \
(!Heap_lock->owned_by_self()) ? "NOT " : "", \
(!SafepointSynchronize::is_at_safepoint()) ? "NOT " : "")
BOOL_TO_STR(Heap_lock->owned_by_self()), \
BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \
BOOL_TO_STR(Thread::current()->is_VM_thread()))
#define assert_heap_locked() \
do { \
......@@ -305,10 +306,11 @@ private:
heap_locking_asserts_err_msg("should be holding the Heap_lock")); \
} while (0)
#define assert_heap_locked_or_at_safepoint() \
#define assert_heap_locked_or_at_safepoint(__should_be_vm_thread) \
do { \
assert(Heap_lock->owned_by_self() || \
SafepointSynchronize::is_at_safepoint(), \
(SafepointSynchronize::is_at_safepoint() && \
((__should_be_vm_thread) == Thread::current()->is_VM_thread())), \
heap_locking_asserts_err_msg("should be holding the Heap_lock or " \
"should be at a safepoint")); \
} while (0)
......@@ -335,9 +337,10 @@ private:
"should not be at a safepoint")); \
} while (0)
#define assert_at_safepoint() \
#define assert_at_safepoint(__should_be_vm_thread) \
do { \
assert(SafepointSynchronize::is_at_safepoint(), \
assert(SafepointSynchronize::is_at_safepoint() && \
((__should_be_vm_thread) == Thread::current()->is_VM_thread()), \
heap_locking_asserts_err_msg("should be at a safepoint")); \
} while (0)
......@@ -362,31 +365,41 @@ protected:
// The current policy object for the collector.
G1CollectorPolicy* _g1_policy;
// Parallel allocation lock to protect the current allocation region.
Mutex _par_alloc_during_gc_lock;
Mutex* par_alloc_during_gc_lock() { return &_par_alloc_during_gc_lock; }
// If possible/desirable, allocate a new HeapRegion for normal object
// allocation sufficient for an allocation of the given "word_size".
// If "do_expand" is true, will attempt to expand the heap if necessary
// to to satisfy the request. If "zero_filled" is true, requires a
// zero-filled region.
// (Returning NULL will trigger a GC.)
virtual HeapRegion* newAllocRegion_work(size_t word_size,
bool do_expand,
bool zero_filled);
virtual HeapRegion* newAllocRegion(size_t word_size,
bool zero_filled = true) {
return newAllocRegion_work(word_size, false, zero_filled);
}
virtual HeapRegion* newAllocRegionWithExpansion(int purpose,
size_t word_size,
bool zero_filled = true);
// This is the second level of trying to allocate a new region. If
// new_region_work didn't find a region in the free_list, this call
// will check whether there's anything available in the
// secondary_free_list and/or wait for more regions to appear in that
// list, if _free_regions_coming is set.
HeapRegion* new_region_try_secondary_free_list(size_t word_size);
// It will try to allocate a single non-humongous HeapRegion
// sufficient for an allocation of the given word_size. If
// do_expand is true, it will attempt to expand the heap if
// necessary to satisfy the allocation request. Note that word_size
// is only used to make sure that we expand sufficiently but, given
// that the allocation request is assumed not to be humongous,
// having word_size is not strictly necessary (expanding by a single
// region will always be sufficient). But let's keep that parameter
// in case we need it in the future.
HeapRegion* new_region_work(size_t word_size, bool do_expand);
// It will try to allocate a new region to be used for allocation by
// mutator threads. It will not try to expand the heap if not region
// is available.
HeapRegion* new_alloc_region(size_t word_size) {
return new_region_work(word_size, false /* do_expand */);
}
// It will try to allocate a new region to be used for allocation by
// a GC thread. It will try to expand the heap if no region is
// available.
HeapRegion* new_gc_alloc_region(int purpose, size_t word_size);
int humongous_obj_allocate_find_first(size_t num_regions, size_t word_size);
// Attempt to allocate an object of the given (very large) "word_size".
// Returns "NULL" on failure.
virtual HeapWord* humongous_obj_allocate(size_t word_size);
HeapWord* humongous_obj_allocate(size_t word_size);
// The following two methods, allocate_new_tlab() and
// mem_allocate(), are the two main entry points from the runtime
......@@ -760,20 +773,29 @@ protected:
// Invoke "save_marks" on all heap regions.
void save_marks();
// Free a heap region.
void free_region(HeapRegion* hr);
// A component of "free_region", exposed for 'batching'.
// All the params after "hr" are out params: the used bytes of the freed
// region(s), the number of H regions cleared, the number of regions
// freed, and pointers to the head and tail of a list of freed contig
// regions, linked throught the "next_on_unclean_list" field.
void free_region_work(HeapRegion* hr,
size_t& pre_used,
size_t& cleared_h,
size_t& freed_regions,
UncleanRegionList* list,
bool par = false);
// It frees a non-humongous region by initializing its contents and
// adding it to the free list that's passed as a parameter (this is
// usually a local list which will be appended to the master free
// list later). The used bytes of freed regions are accumulated in
// pre_used. If par is true, the region's RSet will not be freed
// up. The assumption is that this will be done later.
void free_region(HeapRegion* hr,
size_t* pre_used,
FreeRegionList* free_list,
bool par);
// It frees a humongous region by collapsing it into individual
// regions and calling free_region() for each of them. The freed
// regions will be added to the free list that's passed as a parameter
// (this is usually a local list which will be appended to the
// master free list later). The used bytes of freed regions are
// accumulated in pre_used. If par is true, the region's RSet will
// not be freed up. The assumption is that this will be done later.
void free_humongous_region(HeapRegion* hr,
size_t* pre_used,
FreeRegionList* free_list,
HumongousRegionSet* humongous_proxy_set,
bool par);
// The concurrent marker (and the thread it runs in.)
ConcurrentMark* _cm;
......@@ -783,9 +805,6 @@ protected:
// The concurrent refiner.
ConcurrentG1Refine* _cg1r;
// The concurrent zero-fill thread.
ConcurrentZFThread* _czft;
// The parallel task queues
RefToScanQueueSet *_task_queues;
......@@ -877,9 +896,7 @@ protected:
SubTasksDone* _process_strong_tasks;
// List of regions which require zero filling.
UncleanRegionList _unclean_region_list;
bool _unclean_regions_coming;
volatile bool _free_regions_coming;
public:
......@@ -1002,71 +1019,64 @@ public:
size_t max_regions();
// The number of regions that are completely free.
size_t free_regions();
size_t free_regions() {
return _free_list.length();
}
// The number of regions that are not completely free.
size_t used_regions() { return n_regions() - free_regions(); }
// True iff the ZF thread should run.
bool should_zf();
// The number of regions available for "regular" expansion.
size_t expansion_regions() { return _expansion_regions; }
#ifndef PRODUCT
bool regions_accounted_for();
bool print_region_accounting_info();
void print_region_counts();
#endif
HeapRegion* alloc_region_from_unclean_list(bool zero_filled);
HeapRegion* alloc_region_from_unclean_list_locked(bool zero_filled);
void put_region_on_unclean_list(HeapRegion* r);
void put_region_on_unclean_list_locked(HeapRegion* r);
void prepend_region_list_on_unclean_list(UncleanRegionList* list);
void prepend_region_list_on_unclean_list_locked(UncleanRegionList* list);
void set_unclean_regions_coming(bool b);
void set_unclean_regions_coming_locked(bool b);
// Wait for cleanup to be complete.
void wait_for_cleanup_complete();
// Like above, but assumes that the calling thread owns the Heap_lock.
void wait_for_cleanup_complete_locked();
// Return the head of the unclean list.
HeapRegion* peek_unclean_region_list_locked();
// Remove and return the head of the unclean list.
HeapRegion* pop_unclean_region_list_locked();
// List of regions which are zero filled and ready for allocation.
HeapRegion* _free_region_list;
// Number of elements on the free list.
size_t _free_region_list_size;
// If the head of the unclean list is ZeroFilled, move it to the free
// list.
bool move_cleaned_region_to_free_list_locked();
bool move_cleaned_region_to_free_list();
void put_free_region_on_list_locked(HeapRegion* r);
void put_free_region_on_list(HeapRegion* r);
// Remove and return the head element of the free list.
HeapRegion* pop_free_region_list_locked();
// If "zero_filled" is true, we first try the free list, then we try the
// unclean list, zero-filling the result. If "zero_filled" is false, we
// first try the unclean list, then the zero-filled list.
HeapRegion* alloc_free_region_from_lists(bool zero_filled);
// Verify the integrity of the region lists.
void remove_allocated_regions_from_lists();
bool verify_region_lists();
bool verify_region_lists_locked();
size_t unclean_region_list_length();
size_t free_region_list_length();
// verify_region_sets() performs verification over the region
// lists. It will be compiled in the product code to be used when
// necessary (i.e., during heap verification).
void verify_region_sets();
// verify_region_sets_optional() is planted in the code for
// list verification in non-product builds (and it can be enabled in
// product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1).
#if HEAP_REGION_SET_FORCE_VERIFY
void verify_region_sets_optional() {
verify_region_sets();
}
#else // HEAP_REGION_SET_FORCE_VERIFY
void verify_region_sets_optional() { }
#endif // HEAP_REGION_SET_FORCE_VERIFY
#ifdef ASSERT
bool is_on_free_list(HeapRegion* hr) {
return hr->containing_set() == &_free_list;
}
bool is_on_humongous_set(HeapRegion* hr) {
return hr->containing_set() == &_humongous_set;
}
#endif // ASSERT
// Wrapper for the region list operations that can be called from
// methods outside this class.
void secondary_free_list_add_as_tail(FreeRegionList* list) {
_secondary_free_list.add_as_tail(list);
}
void append_secondary_free_list() {
_free_list.add_as_tail(&_secondary_free_list);
}
void append_secondary_free_list_if_not_empty() {
if (!_secondary_free_list.is_empty()) {
MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag);
append_secondary_free_list();
}
}
void set_free_regions_coming();
void reset_free_regions_coming();
bool free_regions_coming() { return _free_regions_coming; }
void wait_while_free_regions_coming();
// Perform a collection of the heap; intended for use in implementing
// "System.gc". This probably implies as full a collection as the
......@@ -1085,23 +1095,24 @@ public:
// True iff a evacuation has failed in the most-recent collection.
bool evacuation_failed() { return _evacuation_failed; }
// Free a region if it is totally full of garbage. Returns the number of
// bytes freed (0 ==> didn't free it).
size_t free_region_if_totally_empty(HeapRegion *hr);
void free_region_if_totally_empty_work(HeapRegion *hr,
size_t& pre_used,
size_t& cleared_h_regions,
size_t& freed_regions,
UncleanRegionList* list,
bool par = false);
// If we've done free region work that yields the given changes, update
// the relevant global variables.
void finish_free_region_work(size_t pre_used,
size_t cleared_h_regions,
size_t freed_regions,
UncleanRegionList* list);
// It will free a region if it has allocated objects in it that are
// all dead. It calls either free_region() or
// free_humongous_region() depending on the type of the region that
// is passed to it.
void free_region_if_totally_empty(HeapRegion* hr,
size_t* pre_used,
FreeRegionList* free_list,
HumongousRegionSet* humongous_proxy_set,
bool par);
// It appends the free list to the master free list and updates the
// master humongous list according to the contents of the proxy
// list. It also adjusts the total used bytes according to pre_used
// (if par is true, it will do so by taking the ParGCRareEvent_lock).
void update_sets_after_freeing_regions(size_t pre_used,
FreeRegionList* free_list,
HumongousRegionSet* humongous_proxy_set,
bool par);
// Returns "TRUE" iff "p" points into the allocated area of the heap.
virtual bool is_in(const void* p) const;
......@@ -1314,8 +1325,6 @@ public:
return true;
}
virtual bool allocs_are_zero_filled();
// The boundary between a "large" and "small" array of primitives, in
// words.
virtual size_t large_typearray_limit();
......@@ -1546,13 +1555,6 @@ public:
protected:
size_t _max_heap_capacity;
public:
// Temporary: call to mark things unimplemented for the G1 heap (e.g.,
// MemoryService). In productization, we can make this assert false
// to catch such places (as well as searching for calls to this...)
static void g1_unimplemented();
};
#define use_local_bitmaps 1
......
src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp
浏览文件 @ fda06608
......@@ -28,7 +28,7 @@
#include "gc_implementation/g1/concurrentMark.hpp"
#include "gc_implementation/g1/g1CollectedHeap.hpp"
#include "gc_implementation/g1/g1CollectorPolicy.hpp"
#include "gc_implementation/g1/heapRegionSeq.hpp"
#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
#include "utilities/taskqueue.hpp"
// Inline functions for G1CollectedHeap
......@@ -135,7 +135,7 @@ G1CollectedHeap::attempt_allocation(size_t word_size) {
inline void
G1CollectedHeap::retire_cur_alloc_region_common(HeapRegion* cur_alloc_region) {
assert_heap_locked_or_at_safepoint();
assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */);
assert(cur_alloc_region != NULL && cur_alloc_region == _cur_alloc_region,
"pre-condition of the call");
assert(cur_alloc_region->is_young(),
......
src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -2875,8 +2875,6 @@ G1CollectorPolicy_BestRegionsFirst::choose_collection_set(
// Adjust for expansion and slop.
max_live_bytes = max_live_bytes + expansion_bytes;
assert(_g1->regions_accounted_for(), "Region leakage!");
HeapRegion* hr;
if (in_young_gc_mode()) {
double young_start_time_sec = os::elapsedTime();
......
src/share/vm/gc_implementation/g1/g1MarkSweep.cpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -181,26 +181,46 @@ void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
}
class G1PrepareCompactClosure: public HeapRegionClosure {
G1CollectedHeap* _g1h;
ModRefBarrierSet* _mrbs;
CompactPoint _cp;
size_t _pre_used;
FreeRegionList _free_list;
HumongousRegionSet _humongous_proxy_set;
void free_humongous_region(HeapRegion* hr) {
HeapWord* bot = hr->bottom();
HeapWord* end = hr->end();
assert(hr->startsHumongous(),
"Only the start of a humongous region should be freed.");
G1CollectedHeap::heap()->free_region(hr);
_g1h->free_humongous_region(hr, &_pre_used, &_free_list,
&_humongous_proxy_set, false /* par */);
// Do we also need to do this for the continues humongous regions
// we just collapsed?
hr->prepare_for_compaction(&_cp);
// Also clear the part of the card table that will be unused after
// compaction.
_mrbs->clear(MemRegion(hr->compaction_top(), hr->end()));
_mrbs->clear(MemRegion(hr->compaction_top(), end));
}
public:
G1PrepareCompactClosure(CompactibleSpace* cs) :
G1PrepareCompactClosure(CompactibleSpace* cs)
: _g1h(G1CollectedHeap::heap()),
_mrbs(G1CollectedHeap::heap()->mr_bs()),
_cp(NULL, cs, cs->initialize_threshold()),
_mrbs(G1CollectedHeap::heap()->mr_bs())
{}
_pre_used(0),
_free_list("Local Free List for G1MarkSweep"),
_humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { }
void update_sets() {
// We'll recalculate total used bytes and recreate the free list
// at the end of the GC, so no point in updating those values here.
_g1h->update_sets_after_freeing_regions(0, /* pre_used */
NULL, /* free_list */
&_humongous_proxy_set,
false /* par */);
_free_list.remove_all();
}
bool doHeapRegion(HeapRegion* hr) {
if (hr->isHumongous()) {
if (hr->startsHumongous()) {
......@@ -266,6 +286,7 @@ void G1MarkSweep::mark_sweep_phase2() {
G1PrepareCompactClosure blk(sp);
g1h->heap_region_iterate(&blk);
blk.update_sets();
CompactPoint perm_cp(pg, NULL, NULL);
pg->prepare_for_compaction(&perm_cp);
......
src/share/vm/gc_implementation/g1/g1_globals.hpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -75,21 +75,12 @@
"(0 means do not periodically generate this info); " \
"it also requires -XX:+G1SummarizeRSetStats") \
\
diagnostic(bool, G1SummarizeZFStats, false, \
"Summarize zero-filling info") \
\
diagnostic(bool, G1TraceConcRefinement, false, \
"Trace G1 concurrent refinement") \
\
product(intx, G1MarkRegionStackSize, 1024 * 1024, \
"Size of the region stack for concurrent marking.") \
\
develop(bool, G1ConcZeroFill, true, \
"If true, run concurrent zero-filling thread") \
\
develop(intx, G1ConcZFMaxRegions, 1, \
"Stop zero-filling when # of zf'd regions reaches") \
\
develop(bool, G1SATBBarrierPrintNullPreVals, false, \
"If true, count frac of ptr writes with null pre-vals.") \
\
......@@ -99,6 +90,13 @@
develop(intx, G1SATBProcessCompletedThreshold, 20, \
"Number of completed buffers that triggers log processing.") \
\
product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \
"Before enqueueing them, each mutator thread tries to do some " \
"filtering on the SATB buffers it generates. If post-filtering " \
"the percentage of retained entries is over this threshold " \
"the buffer will be enqueued for processing. A value of 0 " \
"specifies that mutator threads should not do such filtering.") \
\
develop(intx, G1ExtraRegionSurvRate, 33, \
"If the young survival rate is S, and there's room left in " \
"to-space, we will allow regions whose survival rate is up to " \
......@@ -282,6 +280,19 @@
"Size of a work unit of cards claimed by a worker thread" \
"during RSet scanning.") \
\
develop(uintx, G1SecondaryFreeListAppendLength, 5, \
"The number of regions we will add to the secondary free list " \
"at every append operation") \
\
develop(bool, G1ConcRegionFreeingVerbose, false, \
"Enables verboseness during concurrent region freeing") \
\
develop(bool, G1StressConcRegionFreeing, false, \
"It stresses the concurrent region freeing operation") \
\
develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \
"Artificial delay during concurrent region freeing") \
\
develop(bool, ReduceInitialCardMarksForG1, false, \
"When ReduceInitialCardMarks is true, this flag setting " \
" controls whether G1 allows the RICM optimization")
......
src/share/vm/gc_implementation/g1/heapRegion.cpp
浏览文件 @ fda06608
......@@ -23,7 +23,6 @@
*/
#include "precompiled.hpp"
#include "gc_implementation/g1/concurrentZFThread.hpp"
#include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp"
#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
#include "gc_implementation/g1/g1OopClosures.inline.hpp"
......@@ -348,22 +347,20 @@ HeapRegion::new_dcto_closure(OopClosure* cl,
}
void HeapRegion::hr_clear(bool par, bool clear_space) {
_humongous_type = NotHumongous;
_humongous_start_region = NULL;
assert(_humongous_type == NotHumongous,
"we should have already filtered out humongous regions");
assert(_humongous_start_region == NULL,
"we should have already filtered out humongous regions");
assert(_end == _orig_end,
"we should have already filtered out humongous regions");
_in_collection_set = false;
_is_gc_alloc_region = false;
// Age stuff (if parallel, this will be done separately, since it needs
// to be sequential).
G1CollectedHeap* g1h = G1CollectedHeap::heap();
set_young_index_in_cset(-1);
uninstall_surv_rate_group();
set_young_type(NotYoung);
// In case it had been the start of a humongous sequence, reset its end.
set_end(_orig_end);
if (!par) {
// If this is parallel, this will be done later.
HeapRegionRemSet* hrrs = rem_set();
......@@ -387,6 +384,7 @@ void HeapRegion::calc_gc_efficiency() {
// </PREDICTION>
void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) {
assert(!isHumongous(), "sanity / pre-condition");
assert(end() == _orig_end,
"Should be normal before the humongous object allocation");
assert(top() == bottom(), "should be empty");
......@@ -400,6 +398,7 @@ void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) {
}
void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) {
assert(!isHumongous(), "sanity / pre-condition");
assert(end() == _orig_end,
"Should be normal before the humongous object allocation");
assert(top() == bottom(), "should be empty");
......@@ -409,6 +408,26 @@ void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) {
_humongous_start_region = first_hr;
}
void HeapRegion::set_notHumongous() {
assert(isHumongous(), "pre-condition");
if (startsHumongous()) {
assert(top() <= end(), "pre-condition");
set_end(_orig_end);
if (top() > end()) {
// at least one "continues humongous" region after it
set_top(end());
}
} else {
// continues humongous
assert(end() == _orig_end, "sanity");
}
assert(capacity() == (size_t) HeapRegion::GrainBytes, "pre-condition");
_humongous_type = NotHumongous;
_humongous_start_region = NULL;
}
bool HeapRegion::claimHeapRegion(jint claimValue) {
jint current = _claimed;
if (current != claimValue) {
......@@ -443,15 +462,6 @@ HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) {
return low;
}
void HeapRegion::set_next_on_unclean_list(HeapRegion* r) {
assert(r == NULL || r->is_on_unclean_list(), "Malformed unclean list.");
_next_in_special_set = r;
}
void HeapRegion::set_on_unclean_list(bool b) {
_is_on_unclean_list = b;
}
void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) {
G1OffsetTableContigSpace::initialize(mr, false, mangle_space);
hr_clear(false/*par*/, clear_space);
......@@ -469,15 +479,16 @@ HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray,
_hrs_index(-1),
_humongous_type(NotHumongous), _humongous_start_region(NULL),
_in_collection_set(false), _is_gc_alloc_region(false),
_is_on_free_list(false), _is_on_unclean_list(false),
_next_in_special_set(NULL), _orig_end(NULL),
_claimed(InitialClaimValue), _evacuation_failed(false),
_prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1),
_young_type(NotYoung), _next_young_region(NULL),
_next_dirty_cards_region(NULL),
_next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false),
#ifdef ASSERT
_containing_set(NULL),
#endif // ASSERT
_young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1),
_rem_set(NULL), _zfs(NotZeroFilled),
_recorded_rs_length(0), _predicted_elapsed_time_ms(0),
_rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0),
_predicted_bytes_to_copy(0)
{
_orig_end = mr.end();
......@@ -552,86 +563,6 @@ void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) {
oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl);
}
#ifdef DEBUG
HeapWord* HeapRegion::allocate(size_t size) {
jint state = zero_fill_state();
assert(!G1CollectedHeap::heap()->allocs_are_zero_filled() ||
zero_fill_is_allocated(),
"When ZF is on, only alloc in ZF'd regions");
return G1OffsetTableContigSpace::allocate(size);
}
#endif
void HeapRegion::set_zero_fill_state_work(ZeroFillState zfs) {
assert(ZF_mon->owned_by_self() ||
Universe::heap()->is_gc_active(),
"Must hold the lock or be a full GC to modify.");
#ifdef ASSERT
if (top() != bottom() && zfs != Allocated) {
ResourceMark rm;
stringStream region_str;
print_on(&region_str);
assert(top() == bottom() || zfs == Allocated,
err_msg("Region must be empty, or we must be setting it to allocated. "
"_zfs=%d, zfs=%d, region: %s", _zfs, zfs, region_str.as_string()));
}
#endif
_zfs = zfs;
}
void HeapRegion::set_zero_fill_complete() {
set_zero_fill_state_work(ZeroFilled);
if (ZF_mon->owned_by_self()) {
ZF_mon->notify_all();
}
}
void HeapRegion::ensure_zero_filled() {
MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag);
ensure_zero_filled_locked();
}
void HeapRegion::ensure_zero_filled_locked() {
assert(ZF_mon->owned_by_self(), "Precondition");
bool should_ignore_zf = SafepointSynchronize::is_at_safepoint();
assert(should_ignore_zf || Heap_lock->is_locked(),
"Either we're in a GC or we're allocating a region.");
switch (zero_fill_state()) {
case HeapRegion::NotZeroFilled:
set_zero_fill_in_progress(Thread::current());
{
ZF_mon->unlock();
Copy::fill_to_words(bottom(), capacity()/HeapWordSize);
ZF_mon->lock_without_safepoint_check();
}
// A trap.
guarantee(zero_fill_state() == HeapRegion::ZeroFilling
&& zero_filler() == Thread::current(),
"AHA! Tell Dave D if you see this...");
set_zero_fill_complete();
// gclog_or_tty->print_cr("Did sync ZF.");
ConcurrentZFThread::note_sync_zfs();
break;
case HeapRegion::ZeroFilling:
if (should_ignore_zf) {
// We can "break" the lock and take over the work.
Copy::fill_to_words(bottom(), capacity()/HeapWordSize);
set_zero_fill_complete();
ConcurrentZFThread::note_sync_zfs();
break;
} else {
ConcurrentZFThread::wait_for_ZF_completed(this);
}
case HeapRegion::ZeroFilled:
// Nothing to do.
break;
case HeapRegion::Allocated:
guarantee(false, "Should not call on allocated regions.");
}
assert(zero_fill_state() == HeapRegion::ZeroFilled, "Post");
}
HeapWord*
HeapRegion::object_iterate_mem_careful(MemRegion mr,
ObjectClosure* cl) {
......@@ -1010,67 +941,3 @@ G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray,
_offsets.set_space(this);
initialize(mr, !is_zeroed, SpaceDecorator::Mangle);
}
size_t RegionList::length() {
size_t len = 0;
HeapRegion* cur = hd();
DEBUG_ONLY(HeapRegion* last = NULL);
while (cur != NULL) {
len++;
DEBUG_ONLY(last = cur);
cur = get_next(cur);
}
assert(last == tl(), "Invariant");
return len;
}
void RegionList::insert_before_head(HeapRegion* r) {
assert(well_formed(), "Inv");
set_next(r, hd());
_hd = r;
_sz++;
if (tl() == NULL) _tl = r;
assert(well_formed(), "Inv");
}
void RegionList::prepend_list(RegionList* new_list) {
assert(well_formed(), "Precondition");
assert(new_list->well_formed(), "Precondition");
HeapRegion* new_tl = new_list->tl();
if (new_tl != NULL) {
set_next(new_tl, hd());
_hd = new_list->hd();
_sz += new_list->sz();
if (tl() == NULL) _tl = new_list->tl();
} else {
assert(new_list->hd() == NULL && new_list->sz() == 0, "Inv");
}
assert(well_formed(), "Inv");
}
void RegionList::delete_after(HeapRegion* r) {
assert(well_formed(), "Precondition");
HeapRegion* next = get_next(r);
assert(r != NULL, "Precondition");
HeapRegion* next_tl = get_next(next);
set_next(r, next_tl);
dec_sz();
if (next == tl()) {
assert(next_tl == NULL, "Inv");
_tl = r;
}
assert(well_formed(), "Inv");
}
HeapRegion* RegionList::pop() {
assert(well_formed(), "Inv");
HeapRegion* res = hd();
if (res != NULL) {
_hd = get_next(res);
_sz--;
set_next(res, NULL);
if (sz() == 0) _tl = NULL;
}
assert(well_formed(), "Inv");
return res;
}
src/share/vm/gc_implementation/g1/heapRegion.hpp
浏览文件 @ fda06608
......@@ -50,6 +50,11 @@ class ContiguousSpace;
class HeapRegionRemSet;
class HeapRegionRemSetIterator;
class HeapRegion;
class HeapRegionSetBase;
#define HR_FORMAT "%d:["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]"
#define HR_FORMAT_PARAMS(__hr) (__hr)->hrs_index(), (__hr)->bottom(), \
(__hr)->top(), (__hr)->end()
// A dirty card to oop closure for heap regions. It
// knows how to get the G1 heap and how to use the bitmap
......@@ -227,12 +232,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
// True iff the region is in current collection_set.
bool _in_collection_set;
// True iff the region is on the unclean list, waiting to be zero filled.
bool _is_on_unclean_list;
// True iff the region is on the free list, ready for allocation.
bool _is_on_free_list;
// Is this or has it been an allocation region in the current collection
// pause.
bool _is_gc_alloc_region;
......@@ -254,6 +253,13 @@ class HeapRegion: public G1OffsetTableContigSpace {
// Next region whose cards need cleaning
HeapRegion* _next_dirty_cards_region;
// Fields used by the HeapRegionSetBase class and subclasses.
HeapRegion* _next;
#ifdef ASSERT
HeapRegionSetBase* _containing_set;
#endif // ASSERT
bool _pending_removal;
// For parallel heapRegion traversal.
jint _claimed;
......@@ -305,10 +311,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
_top_at_conc_mark_count = bot;
}
jint _zfs; // A member of ZeroFillState. Protected by ZF_lock.
Thread* _zero_filler; // If _zfs is ZeroFilling, the thread that (last)
// made it so.
void set_young_type(YoungType new_type) {
//assert(_young_type != new_type, "setting the same type" );
// TODO: add more assertions here
......@@ -362,16 +364,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
RebuildRSClaimValue = 5
};
// Concurrent refinement requires contiguous heap regions (in which TLABs
// might be allocated) to be zero-filled. Each region therefore has a
// zero-fill-state.
enum ZeroFillState {
NotZeroFilled,
ZeroFilling,
ZeroFilled,
Allocated
};
inline HeapWord* par_allocate_no_bot_updates(size_t word_size) {
assert(is_young(), "we can only skip BOT updates on young regions");
return ContiguousSpace::par_allocate(word_size);
......@@ -456,6 +448,9 @@ class HeapRegion: public G1OffsetTableContigSpace {
// which this region will be part of.
void set_continuesHumongous(HeapRegion* first_hr);
// Unsets the humongous-related fields on the region.
void set_notHumongous();
// If the region has a remembered set, return a pointer to it.
HeapRegionRemSet* rem_set() const {
return _rem_set;
......@@ -502,44 +497,55 @@ class HeapRegion: public G1OffsetTableContigSpace {
_next_in_special_set = r;
}
bool is_on_free_list() {
return _is_on_free_list;
}
// Methods used by the HeapRegionSetBase class and subclasses.
void set_on_free_list(bool b) {
_is_on_free_list = b;
}
// Getter and setter for the next field used to link regions into
// linked lists.
HeapRegion* next() { return _next; }
HeapRegion* next_from_free_list() {
assert(is_on_free_list(),
"Should only invoke on free space.");
assert(_next_in_special_set == NULL ||
_next_in_special_set->is_on_free_list(),
"Malformed Free List.");
return _next_in_special_set;
}
void set_next(HeapRegion* next) { _next = next; }
void set_next_on_free_list(HeapRegion* r) {
assert(r == NULL || r->is_on_free_list(), "Malformed free list.");
_next_in_special_set = r;
}
// Every region added to a set is tagged with a reference to that
// set. This is used for doing consistency checking to make sure that
// the contents of a set are as they should be and it's only
// available in non-product builds.
#ifdef ASSERT
void set_containing_set(HeapRegionSetBase* containing_set) {
assert((containing_set == NULL && _containing_set != NULL) ||
(containing_set != NULL && _containing_set == NULL),
err_msg("containing_set: "PTR_FORMAT" "
"_containing_set: "PTR_FORMAT,
containing_set, _containing_set));
bool is_on_unclean_list() {
return _is_on_unclean_list;
}
_containing_set = containing_set;
}
void set_on_unclean_list(bool b);
HeapRegionSetBase* containing_set() { return _containing_set; }
#else // ASSERT
void set_containing_set(HeapRegionSetBase* containing_set) { }
HeapRegion* next_from_unclean_list() {
assert(is_on_unclean_list(),
"Should only invoke on unclean space.");
assert(_next_in_special_set == NULL ||
_next_in_special_set->is_on_unclean_list(),
"Malformed unclean List.");
return _next_in_special_set;
}
// containing_set() is only used in asserts so there's not reason
// to provide a dummy version of it.
#endif // ASSERT
// If we want to remove regions from a list in bulk we can simply tag
// them with the pending_removal tag and call the
// remove_all_pending() method on the list.
void set_next_on_unclean_list(HeapRegion* r);
bool pending_removal() { return _pending_removal; }
void set_pending_removal(bool pending_removal) {
// We can only set pending_removal to true, if it's false and the
// region belongs to a set.
assert(!pending_removal ||
(!_pending_removal && containing_set() != NULL), "pre-condition");
// We can only set pending_removal to false, if it's true and the
// region does not belong to a set.
assert( pending_removal ||
( _pending_removal && containing_set() == NULL), "pre-condition");
_pending_removal = pending_removal;
}
HeapRegion* get_next_young_region() { return _next_young_region; }
void set_next_young_region(HeapRegion* hr) {
......@@ -559,11 +565,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
void initialize(MemRegion mr, bool clear_space, bool mangle_space);
// Ensure that "this" is zero-filled.
void ensure_zero_filled();
// This one requires that the calling thread holds ZF_mon.
void ensure_zero_filled_locked();
// Get the start of the unmarked area in this region.
HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; }
HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; }
......@@ -798,36 +799,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
// "end" of the region if there is no such block.
HeapWord* next_block_start_careful(HeapWord* addr);
// Returns the zero-fill-state of the current region.
ZeroFillState zero_fill_state() { return (ZeroFillState)_zfs; }
bool zero_fill_is_allocated() { return _zfs == Allocated; }
Thread* zero_filler() { return _zero_filler; }
// Indicate that the contents of the region are unknown, and therefore
// might require zero-filling.
void set_zero_fill_needed() {
set_zero_fill_state_work(NotZeroFilled);
}
void set_zero_fill_in_progress(Thread* t) {
set_zero_fill_state_work(ZeroFilling);
_zero_filler = t;
}
void set_zero_fill_complete();
void set_zero_fill_allocated() {
set_zero_fill_state_work(Allocated);
}
void set_zero_fill_state_work(ZeroFillState zfs);
// This is called when a full collection shrinks the heap.
// We want to set the heap region to a value which says
// it is no longer part of the heap. For now, we'll let "NotZF" fill
// that role.
void reset_zero_fill() {
set_zero_fill_state_work(NotZeroFilled);
_zero_filler = NULL;
}
size_t recorded_rs_length() const { return _recorded_rs_length; }
double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; }
size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; }
......@@ -866,10 +837,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
// Override; it uses the "prev" marking information
virtual void verify(bool allow_dirty) const;
#ifdef DEBUG
HeapWord* allocate(size_t size);
#endif
};
// HeapRegionClosure is used for iterating over regions.
......@@ -892,113 +859,6 @@ class HeapRegionClosure : public StackObj {
bool complete() { return _complete; }
};
// A linked lists of heap regions. It leaves the "next" field
// unspecified; that's up to subtypes.
class RegionList VALUE_OBJ_CLASS_SPEC {
protected:
virtual HeapRegion* get_next(HeapRegion* chr) = 0;
virtual void set_next(HeapRegion* chr,
HeapRegion* new_next) = 0;
HeapRegion* _hd;
HeapRegion* _tl;
size_t _sz;
// Protected constructor because this type is only meaningful
// when the _get/_set next functions are defined.
RegionList() : _hd(NULL), _tl(NULL), _sz(0) {}
public:
void reset() {
_hd = NULL;
_tl = NULL;
_sz = 0;
}
HeapRegion* hd() { return _hd; }
HeapRegion* tl() { return _tl; }
size_t sz() { return _sz; }
size_t length();
bool well_formed() {
return
((hd() == NULL && tl() == NULL && sz() == 0)
|| (hd() != NULL && tl() != NULL && sz() > 0))
&& (sz() == length());
}
virtual void insert_before_head(HeapRegion* r);
void prepend_list(RegionList* new_list);
virtual HeapRegion* pop();
void dec_sz() { _sz--; }
// Requires that "r" is an element of the list, and is not the tail.
void delete_after(HeapRegion* r);
};
class EmptyNonHRegionList: public RegionList {
protected:
// Protected constructor because this type is only meaningful
// when the _get/_set next functions are defined.
EmptyNonHRegionList() : RegionList() {}
public:
void insert_before_head(HeapRegion* r) {
// assert(r->is_empty(), "Better be empty");
assert(!r->isHumongous(), "Better not be humongous.");
RegionList::insert_before_head(r);
}
void prepend_list(EmptyNonHRegionList* new_list) {
// assert(new_list->hd() == NULL || new_list->hd()->is_empty(),
// "Better be empty");
assert(new_list->hd() == NULL || !new_list->hd()->isHumongous(),
"Better not be humongous.");
// assert(new_list->tl() == NULL || new_list->tl()->is_empty(),
// "Better be empty");
assert(new_list->tl() == NULL || !new_list->tl()->isHumongous(),
"Better not be humongous.");
RegionList::prepend_list(new_list);
}
};
class UncleanRegionList: public EmptyNonHRegionList {
public:
HeapRegion* get_next(HeapRegion* hr) {
return hr->next_from_unclean_list();
}
void set_next(HeapRegion* hr, HeapRegion* new_next) {
hr->set_next_on_unclean_list(new_next);
}
UncleanRegionList() : EmptyNonHRegionList() {}
void insert_before_head(HeapRegion* r) {
assert(!r->is_on_free_list(),
"Better not already be on free list");
assert(!r->is_on_unclean_list(),
"Better not already be on unclean list");
r->set_zero_fill_needed();
r->set_on_unclean_list(true);
EmptyNonHRegionList::insert_before_head(r);
}
void prepend_list(UncleanRegionList* new_list) {
assert(new_list->tl() == NULL || !new_list->tl()->is_on_free_list(),
"Better not already be on free list");
assert(new_list->tl() == NULL || new_list->tl()->is_on_unclean_list(),
"Better already be marked as on unclean list");
assert(new_list->hd() == NULL || !new_list->hd()->is_on_free_list(),
"Better not already be on free list");
assert(new_list->hd() == NULL || new_list->hd()->is_on_unclean_list(),
"Better already be marked as on unclean list");
EmptyNonHRegionList::prepend_list(new_list);
}
HeapRegion* pop() {
HeapRegion* res = RegionList::pop();
if (res != NULL) res->set_on_unclean_list(false);
return res;
}
};
// Local Variables: ***
// c-indentation-style: gnu ***
// End: ***
#endif // SERIALGC
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP
src/share/vm/gc_implementation/g1/heapRegionSeq.cpp
浏览文件 @ fda06608
......@@ -65,152 +65,6 @@ HeapRegionSeq::HeapRegionSeq(const size_t max_size) :
// Private methods.
HeapWord*
HeapRegionSeq::alloc_obj_from_region_index(int ind, size_t word_size) {
assert(G1CollectedHeap::isHumongous(word_size),
"Allocation size should be humongous");
int cur = ind;
int first = cur;
size_t sumSizes = 0;
while (cur < _regions.length() && sumSizes < word_size) {
// Loop invariant:
// For all i in [first, cur):
// _regions.at(i)->is_empty()
// && _regions.at(i) is contiguous with its predecessor, if any
// && sumSizes is the sum of the sizes of the regions in the interval
// [first, cur)
HeapRegion* curhr = _regions.at(cur);
if (curhr->is_empty()
&& (first == cur
|| (_regions.at(cur-1)->end() ==
curhr->bottom()))) {
sumSizes += curhr->capacity() / HeapWordSize;
} else {
first = cur + 1;
sumSizes = 0;
}
cur++;
}
if (sumSizes >= word_size) {
_alloc_search_start = cur;
// We need to initialize the region(s) we just discovered. This is
// a bit tricky given that it can happen concurrently with
// refinement threads refining cards on these regions and
// potentially wanting to refine the BOT as they are scanning
// those cards (this can happen shortly after a cleanup; see CR
// 6991377). So we have to set up the region(s) carefully and in
// a specific order.
// Currently, allocs_are_zero_filled() returns false. The zero
// filling infrastructure will be going away soon (see CR 6977804).
// So no need to do anything else here.
bool zf = G1CollectedHeap::heap()->allocs_are_zero_filled();
assert(!zf, "not supported");
// This will be the "starts humongous" region.
HeapRegion* first_hr = _regions.at(first);
{
MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag);
first_hr->set_zero_fill_allocated();
}
// The header of the new object will be placed at the bottom of
// the first region.
HeapWord* new_obj = first_hr->bottom();
// This will be the new end of the first region in the series that
// should also match the end of the last region in the seriers.
// (Note: sumSizes = "region size" x "number of regions we found").
HeapWord* new_end = new_obj + sumSizes;
// This will be the new top of the first region that will reflect
// this allocation.
HeapWord* new_top = new_obj + word_size;
// First, we need to zero the header of the space that we will be
// allocating. When we update top further down, some refinement
// threads might try to scan the region. By zeroing the header we
// ensure that any thread that will try to scan the region will
// come across the zero klass word and bail out.
//
// NOTE: It would not have been correct to have used
// CollectedHeap::fill_with_object() and make the space look like
// an int array. The thread that is doing the allocation will
// later update the object header to a potentially different array
// type and, for a very short period of time, the klass and length
// fields will be inconsistent. This could cause a refinement
// thread to calculate the object size incorrectly.
Copy::fill_to_words(new_obj, oopDesc::header_size(), 0);
// We will set up the first region as "starts humongous". This
// will also update the BOT covering all the regions to reflect
// that there is a single object that starts at the bottom of the
// first region.
first_hr->set_startsHumongous(new_top, new_end);
// Then, if there are any, we will set up the "continues
// humongous" regions.
HeapRegion* hr = NULL;
for (int i = first + 1; i < cur; ++i) {
hr = _regions.at(i);
{
MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag);
hr->set_zero_fill_allocated();
}
hr->set_continuesHumongous(first_hr);
}
// If we have "continues humongous" regions (hr != NULL), then the
// end of the last one should match new_end.
assert(hr == NULL || hr->end() == new_end, "sanity");
// Up to this point no concurrent thread would have been able to
// do any scanning on any region in this series. All the top
// fields still point to bottom, so the intersection between
// [bottom,top] and [card_start,card_end] will be empty. Before we
// update the top fields, we'll do a storestore to make sure that
// no thread sees the update to top before the zeroing of the
// object header and the BOT initialization.
OrderAccess::storestore();
// Now that the BOT and the object header have been initialized,
// we can update top of the "starts humongous" region.
assert(first_hr->bottom() < new_top && new_top <= first_hr->end(),
"new_top should be in this region");
first_hr->set_top(new_top);
// Now, we will update the top fields of the "continues humongous"
// regions. The reason we need to do this is that, otherwise,
// these regions would look empty and this will confuse parts of
// G1. For example, the code that looks for a consecutive number
// of empty regions will consider them empty and try to
// re-allocate them. We can extend is_empty() to also include
// !continuesHumongous(), but it is easier to just update the top
// fields here.
hr = NULL;
for (int i = first + 1; i < cur; ++i) {
hr = _regions.at(i);
if ((i + 1) == cur) {
// last continues humongous region
assert(hr->bottom() < new_top && new_top <= hr->end(),
"new_top should fall on this region");
hr->set_top(new_top);
} else {
// not last one
assert(new_top > hr->end(), "new_top should be above this region");
hr->set_top(hr->end());
}
}
// If we have continues humongous regions (hr != NULL), then the
// end of the last one should match new_end and its top should
// match new_top.
assert(hr == NULL ||
(hr->end() == new_end && hr->top() == new_top), "sanity");
return new_obj;
} else {
// If we started from the beginning, we want to know why we can't alloc.
return NULL;
}
}
void HeapRegionSeq::print_empty_runs() {
int empty_run = 0;
int n_empty = 0;
......@@ -284,13 +138,67 @@ size_t HeapRegionSeq::free_suffix() {
return res;
}
HeapWord* HeapRegionSeq::obj_allocate(size_t word_size) {
int cur = _alloc_search_start;
// Make sure "cur" is a valid index.
assert(cur >= 0, "Invariant.");
HeapWord* res = alloc_obj_from_region_index(cur, word_size);
if (res == NULL)
res = alloc_obj_from_region_index(0, word_size);
int HeapRegionSeq::find_contiguous_from(int from, size_t num) {
assert(num > 1, "pre-condition");
assert(0 <= from && from <= _regions.length(),
err_msg("from: %d should be valid and <= than %d",
from, _regions.length()));
int curr = from;
int first = -1;
size_t num_so_far = 0;
while (curr < _regions.length() && num_so_far < num) {
HeapRegion* curr_hr = _regions.at(curr);
if (curr_hr->is_empty()) {
if (first == -1) {
first = curr;
num_so_far = 1;
} else {
num_so_far += 1;
}
} else {
first = -1;
num_so_far = 0;
}
curr += 1;
}
assert(num_so_far <= num, "post-condition");
if (num_so_far == num) {
// we find enough space for the humongous object
assert(from <= first && first < _regions.length(), "post-condition");
assert(first < curr && (curr - first) == (int) num, "post-condition");
for (int i = first; i < first + (int) num; ++i) {
assert(_regions.at(i)->is_empty(), "post-condition");
}
return first;
} else {
// we failed to find enough space for the humongous object
return -1;
}
}
int HeapRegionSeq::find_contiguous(size_t num) {
assert(num > 1, "otherwise we should not be calling this");
assert(0 <= _alloc_search_start && _alloc_search_start <= _regions.length(),
err_msg("_alloc_search_start: %d should be valid and <= than %d",
_alloc_search_start, _regions.length()));
int start = _alloc_search_start;
int res = find_contiguous_from(start, num);
if (res == -1 && start != 0) {
// Try starting from the beginning. If _alloc_search_start was 0,
// no point in doing this again.
res = find_contiguous_from(0, num);
}
if (res != -1) {
assert(0 <= res && res < _regions.length(),
err_msg("res: %d should be valid", res));
_alloc_search_start = res + (int) num;
}
assert(0 < _alloc_search_start && _alloc_search_start <= _regions.length(),
err_msg("_alloc_search_start: %d should be valid",
_alloc_search_start));
return res;
}
......@@ -376,6 +284,10 @@ void HeapRegionSeq::iterate_from(int idx, HeapRegionClosure* blk) {
MemRegion HeapRegionSeq::shrink_by(size_t shrink_bytes,
size_t& num_regions_deleted) {
// Reset this in case it's currently pointing into the regions that
// we just removed.
_alloc_search_start = 0;
assert(shrink_bytes % os::vm_page_size() == 0, "unaligned");
assert(shrink_bytes % HeapRegion::GrainBytes == 0, "unaligned");
......@@ -395,7 +307,6 @@ MemRegion HeapRegionSeq::shrink_by(size_t shrink_bytes,
}
assert(cur == _regions.top(), "Should be top");
if (!cur->is_empty()) break;
cur->reset_zero_fill();
shrink_bytes -= cur->capacity();
num_regions_deleted++;
_regions.pop();
......@@ -410,7 +321,6 @@ MemRegion HeapRegionSeq::shrink_by(size_t shrink_bytes,
return MemRegion(last_start, end);
}
class PrintHeapRegionClosure : public HeapRegionClosure {
public:
bool doHeapRegion(HeapRegion* r) {
......
src/share/vm/gc_implementation/g1/heapRegionSeq.hpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -41,9 +41,9 @@ class HeapRegionSeq: public CHeapObj {
// (For efficiency only; private to obj_allocate after initialization.)
int _alloc_search_start;
// Attempts to allocate a block of the (assumed humongous) word_size,
// starting at the region "ind".
HeapWord* alloc_obj_from_region_index(int ind, size_t word_size);
// Finds a contiguous set of empty regions of length num, starting
// from a given index.
int find_contiguous_from(int from, size_t num);
// Currently, we're choosing collection sets in a round-robin fashion,
// starting here.
......@@ -76,11 +76,8 @@ class HeapRegionSeq: public CHeapObj {
// that are available for allocation.
size_t free_suffix();
// Requires "word_size" to be humongous (in the technical sense). If
// possible, allocates a contiguous subsequence of the heap regions to
// satisfy the allocation, and returns the address of the beginning of
// that sequence, otherwise returns NULL.
HeapWord* obj_allocate(size_t word_size);
// Finds a contiguous set of empty regions of length num.
int find_contiguous(size_t num);
// Apply the "doHeapRegion" method of "blk" to all regions in "this",
// in address order, terminating the iteration early
......@@ -106,7 +103,7 @@ class HeapRegionSeq: public CHeapObj {
// If "addr" falls within a region in the sequence, return that region,
// or else NULL.
HeapRegion* addr_to_region(const void* addr);
inline HeapRegion* addr_to_region(const void* addr);
void print();
......
src/share/vm/gc_implementation/g1/heapRegionSet.cpp 0 → 100644
浏览文件 @ fda06608
/*
* Copyright (c) 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/heapRegionSet.inline.hpp"
size_t HeapRegionSetBase::_unrealistically_long_length = 0;
//////////////////// HeapRegionSetBase ////////////////////
void HeapRegionSetBase::set_unrealistically_long_length(size_t len) {
guarantee(_unrealistically_long_length == 0, "should only be set once");
_unrealistically_long_length = len;
}
size_t HeapRegionSetBase::calculate_region_num(HeapRegion* hr) {
assert(hr->startsHumongous(), "pre-condition");
assert(hr->capacity() % HeapRegion::GrainBytes == 0, "invariant");
size_t region_num = hr->capacity() >> HeapRegion::LogOfHRGrainBytes;
assert(region_num > 0, "sanity");
return region_num;
}
void HeapRegionSetBase::fill_in_ext_msg(hrl_ext_msg* msg, const char* message) {
msg->append("[%s] %s "
"ln: "SIZE_FORMAT" rn: "SIZE_FORMAT" "
"cy: "SIZE_FORMAT" ud: "SIZE_FORMAT,
name(), message, length(), region_num(),
total_capacity_bytes(), total_used_bytes());
fill_in_ext_msg_extra(msg);
}
bool HeapRegionSetBase::verify_region(HeapRegion* hr,
HeapRegionSetBase* expected_containing_set) {
const char* error_message = NULL;
if (!regions_humongous()) {
if (hr->isHumongous()) {
error_message = "the region should not be humongous";
}
} else {
if (!hr->isHumongous() || !hr->startsHumongous()) {
error_message = "the region should be 'starts humongous'";
}
}
if (!regions_empty()) {
if (hr->is_empty()) {
error_message = "the region should not be empty";
}
} else {
if (!hr->is_empty()) {
error_message = "the region should be empty";
}
}
#ifdef ASSERT
// The _containing_set field is only available when ASSERT is defined.
if (hr->containing_set() != expected_containing_set) {
error_message = "inconsistent containing set found";
}
#endif // ASSERT
const char* extra_error_message = verify_region_extra(hr);
if (extra_error_message != NULL) {
error_message = extra_error_message;
}
if (error_message != NULL) {
outputStream* out = tty;
out->cr();
out->print_cr("## [%s] %s", name(), error_message);
out->print_cr("## Offending Region: "PTR_FORMAT, hr);
out->print_cr(" "HR_FORMAT, HR_FORMAT_PARAMS(hr));
#ifdef ASSERT
out->print_cr(" containing set: "PTR_FORMAT, hr->containing_set());
#endif // ASSERT
out->print_cr("## Offending Region Set: "PTR_FORMAT, this);
print_on(out);
return false;
} else {
return true;
}
}
void HeapRegionSetBase::verify() {
// It's important that we also observe the MT safety protocol even
// for the verification calls. If we do verification without the
// appropriate locks and the set changes underneath our feet
// verification might fail and send us on a wild goose chase.
hrl_assert_mt_safety_ok(this);
guarantee(( is_empty() && length() == 0 && region_num() == 0 &&
total_used_bytes() == 0 && total_capacity_bytes() == 0) ||
(!is_empty() && length() >= 0 && region_num() >= 0 &&
total_used_bytes() >= 0 && total_capacity_bytes() >= 0),
hrl_ext_msg(this, "invariant"));
guarantee((!regions_humongous() && region_num() == length()) ||
( regions_humongous() && region_num() >= length()),
hrl_ext_msg(this, "invariant"));
guarantee(!regions_empty() || total_used_bytes() == 0,
hrl_ext_msg(this, "invariant"));
guarantee(total_used_bytes() <= total_capacity_bytes(),
hrl_ext_msg(this, "invariant"));
}
void HeapRegionSetBase::verify_start() {
// See comment in verify() about MT safety and verification.
hrl_assert_mt_safety_ok(this);
assert(!_verify_in_progress,
hrl_ext_msg(this, "verification should not be in progress"));
// Do the basic verification first before we do the checks over the regions.
HeapRegionSetBase::verify();
_calc_length = 0;
_calc_region_num = 0;
_calc_total_capacity_bytes = 0;
_calc_total_used_bytes = 0;
_verify_in_progress = true;
}
void HeapRegionSetBase::verify_next_region(HeapRegion* hr) {
// See comment in verify() about MT safety and verification.
hrl_assert_mt_safety_ok(this);
assert(_verify_in_progress,
hrl_ext_msg(this, "verification should be in progress"));
guarantee(verify_region(hr, this), hrl_ext_msg(this, "region verification"));
_calc_length += 1;
if (!hr->isHumongous()) {
_calc_region_num += 1;
} else {
_calc_region_num += calculate_region_num(hr);
}
_calc_total_capacity_bytes += hr->capacity();
_calc_total_used_bytes += hr->used();
}
void HeapRegionSetBase::verify_end() {
// See comment in verify() about MT safety and verification.
hrl_assert_mt_safety_ok(this);
assert(_verify_in_progress,
hrl_ext_msg(this, "verification should be in progress"));
guarantee(length() == _calc_length,
hrl_err_msg("[%s] length: "SIZE_FORMAT" should be == "
"calc length: "SIZE_FORMAT,
name(), length(), _calc_length));
guarantee(region_num() == _calc_region_num,
hrl_err_msg("[%s] region num: "SIZE_FORMAT" should be == "
"calc region num: "SIZE_FORMAT,
name(), region_num(), _calc_region_num));
guarantee(total_capacity_bytes() == _calc_total_capacity_bytes,
hrl_err_msg("[%s] capacity bytes: "SIZE_FORMAT" should be == "
"calc capacity bytes: "SIZE_FORMAT,
name(),
total_capacity_bytes(), _calc_total_capacity_bytes));
guarantee(total_used_bytes() == _calc_total_used_bytes,
hrl_err_msg("[%s] used bytes: "SIZE_FORMAT" should be == "
"calc used bytes: "SIZE_FORMAT,
name(), total_used_bytes(), _calc_total_used_bytes));
_verify_in_progress = false;
}
void HeapRegionSetBase::print_on(outputStream* out, bool print_contents) {
out->cr();
out->print_cr("Set: %s ("PTR_FORMAT")", name(), this);
out->print_cr(" Region Assumptions");
out->print_cr(" humongous : %s", BOOL_TO_STR(regions_humongous()));
out->print_cr(" empty : %s", BOOL_TO_STR(regions_empty()));
out->print_cr(" Attributes");
out->print_cr(" length : "SIZE_FORMAT_W(14), length());
out->print_cr(" region num : "SIZE_FORMAT_W(14), region_num());
out->print_cr(" total capacity : "SIZE_FORMAT_W(14)" bytes",
total_capacity_bytes());
out->print_cr(" total used : "SIZE_FORMAT_W(14)" bytes",
total_used_bytes());
}
void HeapRegionSetBase::clear() {
_length = 0;
_region_num = 0;
_total_used_bytes = 0;
}
HeapRegionSetBase::HeapRegionSetBase(const char* name)
: _name(name), _verify_in_progress(false),
_calc_length(0), _calc_region_num(0),
_calc_total_capacity_bytes(0), _calc_total_used_bytes(0) { }
//////////////////// HeapRegionSet ////////////////////
void HeapRegionSet::update_from_proxy(HeapRegionSet* proxy_set) {
hrl_assert_mt_safety_ok(this);
hrl_assert_mt_safety_ok(proxy_set);
hrl_assert_sets_match(this, proxy_set);
verify_optional();
proxy_set->verify_optional();
if (proxy_set->is_empty()) return;
assert(proxy_set->length() <= _length,
hrl_err_msg("[%s] proxy set length: "SIZE_FORMAT" "
"should be <= length: "SIZE_FORMAT,
name(), proxy_set->length(), _length));
_length -= proxy_set->length();
assert(proxy_set->region_num() <= _region_num,
hrl_err_msg("[%s] proxy set region num: "SIZE_FORMAT" "
"should be <= region num: "SIZE_FORMAT,
name(), proxy_set->region_num(), _region_num));
_region_num -= proxy_set->region_num();
assert(proxy_set->total_used_bytes() <= _total_used_bytes,
hrl_err_msg("[%s] proxy set used bytes: "SIZE_FORMAT" "
"should be <= used bytes: "SIZE_FORMAT,
name(), proxy_set->total_used_bytes(),
_total_used_bytes));
_total_used_bytes -= proxy_set->total_used_bytes();
proxy_set->clear();
verify_optional();
proxy_set->verify_optional();
}
//////////////////// HeapRegionLinkedList ////////////////////
void HeapRegionLinkedList::fill_in_ext_msg_extra(hrl_ext_msg* msg) {
msg->append(" hd: "PTR_FORMAT" tl: "PTR_FORMAT, head(), tail());
}
void HeapRegionLinkedList::add_as_tail(HeapRegionLinkedList* from_list) {
hrl_assert_mt_safety_ok(this);
hrl_assert_mt_safety_ok(from_list);
verify_optional();
from_list->verify_optional();
if (from_list->is_empty()) return;
#ifdef ASSERT
HeapRegionLinkedListIterator iter(from_list);
while (iter.more_available()) {
HeapRegion* hr = iter.get_next();
// In set_containing_set() we check that we either set the value
// from NULL to non-NULL or vice versa to catch bugs. So, we have
// to NULL it first before setting it to the value.
hr->set_containing_set(NULL);
hr->set_containing_set(this);
}
#endif // ASSERT
if (_tail != NULL) {
assert(length() > 0 && _head != NULL, hrl_ext_msg(this, "invariant"));
_tail->set_next(from_list->_head);
} else {
assert(length() == 0 && _head == NULL, hrl_ext_msg(this, "invariant"));
_head = from_list->_head;
}
_tail = from_list->_tail;
_length += from_list->length();
_region_num += from_list->region_num();
_total_used_bytes += from_list->total_used_bytes();
from_list->clear();
verify_optional();
from_list->verify_optional();
}
void HeapRegionLinkedList::remove_all() {
hrl_assert_mt_safety_ok(this);
verify_optional();
HeapRegion* curr = _head;
while (curr != NULL) {
hrl_assert_region_ok(this, curr, this);
HeapRegion* next = curr->next();
curr->set_next(NULL);
curr->set_containing_set(NULL);
curr = next;
}
clear();
verify_optional();
}
void HeapRegionLinkedList::remove_all_pending(size_t target_count) {
hrl_assert_mt_safety_ok(this);
assert(target_count > 1, hrl_ext_msg(this, "pre-condition"));
assert(!is_empty(), hrl_ext_msg(this, "pre-condition"));
verify_optional();
DEBUG_ONLY(size_t old_length = length();)
HeapRegion* curr = _head;
HeapRegion* prev = NULL;
size_t count = 0;
while (curr != NULL) {
hrl_assert_region_ok(this, curr, this);
HeapRegion* next = curr->next();
if (curr->pending_removal()) {
assert(count < target_count,
hrl_err_msg("[%s] should not come across more regions "
"pending for removal than target_count: "SIZE_FORMAT,
name(), target_count));
if (prev == NULL) {
assert(_head == curr, hrl_ext_msg(this, "invariant"));
_head = next;
} else {
assert(_head != curr, hrl_ext_msg(this, "invariant"));
prev->set_next(next);
}
if (next == NULL) {
assert(_tail == curr, hrl_ext_msg(this, "invariant"));
_tail = prev;
} else {
assert(_tail != curr, hrl_ext_msg(this, "invariant"));
}
curr->set_next(NULL);
remove_internal(curr);
curr->set_pending_removal(false);
count += 1;
// If we have come across the target number of regions we can
// just bail out. However, for debugging purposes, we can just
// carry on iterating to make sure there are not more regions
// tagged with pending removal.
DEBUG_ONLY(if (count == target_count) break;)
} else {
prev = curr;
}
curr = next;
}
assert(count == target_count,
hrl_err_msg("[%s] count: "SIZE_FORMAT" should be == "
"target_count: "SIZE_FORMAT, name(), count, target_count));
assert(length() + target_count == old_length,
hrl_err_msg("[%s] new length should be consistent "
"new length: "SIZE_FORMAT" old length: "SIZE_FORMAT" "
"target_count: "SIZE_FORMAT,
name(), length(), old_length, target_count));
verify_optional();
}
void HeapRegionLinkedList::verify() {
// See comment in HeapRegionSetBase::verify() about MT safety and
// verification.
hrl_assert_mt_safety_ok(this);
// This will also do the basic verification too.
verify_start();
HeapRegion* curr = _head;
HeapRegion* prev1 = NULL;
HeapRegion* prev0 = NULL;
size_t count = 0;
while (curr != NULL) {
verify_next_region(curr);
count += 1;
guarantee(count < _unrealistically_long_length,
hrl_err_msg("[%s] the calculated length: "SIZE_FORMAT" "
"seems very long, is there maybe a cycle? "
"curr: "PTR_FORMAT" prev0: "PTR_FORMAT" "
"prev1: "PTR_FORMAT" length: "SIZE_FORMAT,
name(), count, curr, prev0, prev1, length()));
prev1 = prev0;
prev0 = curr;
curr = curr->next();
}
guarantee(_tail == prev0, hrl_ext_msg(this, "post-condition"));
verify_end();
}
void HeapRegionLinkedList::clear() {
HeapRegionSetBase::clear();
_head = NULL;
_tail = NULL;
}
void HeapRegionLinkedList::print_on(outputStream* out, bool print_contents) {
HeapRegionSetBase::print_on(out, print_contents);
out->print_cr(" Linking");
out->print_cr(" head : "PTR_FORMAT, _head);
out->print_cr(" tail : "PTR_FORMAT, _tail);
if (print_contents) {
out->print_cr(" Contents");
HeapRegionLinkedListIterator iter(this);
while (iter.more_available()) {
HeapRegion* hr = iter.get_next();
hr->print_on(out);
}
}
}
src/share/vm/gc_implementation/g1/heapRegionSet.hpp 0 → 100644
浏览文件 @ fda06608
/*
* copyright (c) 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.
*
*/
#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP
#include "gc_implementation/g1/heapRegion.hpp"
// Large buffer for some cases where the output might be larger than normal.
#define HRL_ERR_MSG_BUFSZ 512
typedef FormatBuffer<HRL_ERR_MSG_BUFSZ> hrl_err_msg;
// Set verification will be forced either if someone defines
// HEAP_REGION_SET_FORCE_VERIFY to be 1, or in builds in which
// asserts are compiled in.
#ifndef HEAP_REGION_SET_FORCE_VERIFY
#define HEAP_REGION_SET_FORCE_VERIFY defined(ASSERT)
#endif // HEAP_REGION_SET_FORCE_VERIFY
//////////////////// HeapRegionSetBase ////////////////////
// Base class for all the classes that represent heap region sets. It
// contains the basic attributes that each set needs to maintain
// (e.g., length, region num, used bytes sum) plus any shared
// functionality (e.g., verification).
class hrl_ext_msg;
class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC {
friend class hrl_ext_msg;
protected:
static size_t calculate_region_num(HeapRegion* hr);
static size_t _unrealistically_long_length;
// The number of regions added to the set. If the set contains
// only humongous regions, this reflects only 'starts humongous'
// regions and does not include 'continues humongous' ones.
size_t _length;
// The total number of regions represented by the set. If the set
// does not contain humongous regions, this should be the same as
// _length. If the set contains only humongous regions, this will
// include the 'continues humongous' regions.
size_t _region_num;
// We don't keep track of the total capacity explicitly, we instead
// recalculate it based on _region_num and the heap region size.
// The sum of used bytes in the all the regions in the set.
size_t _total_used_bytes;
const char* _name;
bool _verify_in_progress;
size_t _calc_length;
size_t _calc_region_num;
size_t _calc_total_capacity_bytes;
size_t _calc_total_used_bytes;
// verify_region() is used to ensure that the contents of a region
// added to / removed from a set are consistent. Different sets
// make different assumptions about the regions added to them. So
// each set can override verify_region_extra(), which is called
// from verify_region(), and do any extra verification it needs to
// perform in that.
virtual const char* verify_region_extra(HeapRegion* hr) { return NULL; }
bool verify_region(HeapRegion* hr,
HeapRegionSetBase* expected_containing_set);
// Indicates whether all regions in the set should be humongous or
// not. Only used during verification.
virtual bool regions_humongous() = 0;
// Indicates whether all regions in the set should be empty or
// not. Only used during verification.
virtual bool regions_empty() = 0;
// Subclasses can optionally override this to do MT safety protocol
// checks. It is called in an assert from all methods that perform
// updates on the set (and subclasses should also call it too).
virtual bool check_mt_safety() { return true; }
// fill_in_ext_msg() writes the the values of the set's attributes
// in the custom err_msg (hrl_ext_msg). fill_in_ext_msg_extra()
// allows subclasses to append further information.
virtual void fill_in_ext_msg_extra(hrl_ext_msg* msg) { }
void fill_in_ext_msg(hrl_ext_msg* msg, const char* message);
// It updates the fields of the set to reflect hr being added to
// the set.
inline void update_for_addition(HeapRegion* hr);
// It updates the fields of the set to reflect hr being added to
// the set and tags the region appropriately.
inline void add_internal(HeapRegion* hr);
// It updates the fields of the set to reflect hr being removed
// from the set.
inline void update_for_removal(HeapRegion* hr);
// It updates the fields of the set to reflect hr being removed
// from the set and tags the region appropriately.
inline void remove_internal(HeapRegion* hr);
// It clears all the fields of the sets. Note: it will not iterate
// over the set and remove regions from it. It assumes that the
// caller has already done so. It will literally just clear the fields.
virtual void clear();
HeapRegionSetBase(const char* name);
public:
static void set_unrealistically_long_length(size_t len);
const char* name() { return _name; }
size_t length() { return _length; }
bool is_empty() { return _length == 0; }
size_t region_num() { return _region_num; }
size_t total_capacity_bytes() {
return region_num() << HeapRegion::LogOfHRGrainBytes;
}
size_t total_used_bytes() { return _total_used_bytes; }
virtual void verify();
void verify_start();
void verify_next_region(HeapRegion* hr);
void verify_end();
#if HEAP_REGION_SET_FORCE_VERIFY
void verify_optional() {
verify();
}
#else // HEAP_REGION_SET_FORCE_VERIFY
void verify_optional() { }
#endif // HEAP_REGION_SET_FORCE_VERIFY
virtual void print_on(outputStream* out, bool print_contents = false);
};
// Customized err_msg for heap region sets. Apart from a
// assert/guarantee-specific message it also prints out the values of
// the fields of the associated set. This can be very helpful in
// diagnosing failures.
class hrl_ext_msg : public hrl_err_msg {
public:
hrl_ext_msg(HeapRegionSetBase* set, const char* message) : hrl_err_msg("") {
set->fill_in_ext_msg(this, message);
}
};
// These two macros are provided for convenience, to keep the uses of
// these two asserts a bit more concise.
#define hrl_assert_mt_safety_ok(_set_) \
do { \
assert((_set_)->check_mt_safety(), hrl_ext_msg((_set_), "MT safety")); \
} while (0)
#define hrl_assert_region_ok(_set_, _hr_, _expected_) \
do { \
assert((_set_)->verify_region((_hr_), (_expected_)), \
hrl_ext_msg((_set_), "region verification")); \
} while (0)
//////////////////// HeapRegionSet ////////////////////
#define hrl_assert_sets_match(_set1_, _set2_) \
do { \
assert(((_set1_)->regions_humongous() == \
(_set2_)->regions_humongous()) && \
((_set1_)->regions_empty() == (_set2_)->regions_empty()), \
hrl_err_msg("the contents of set %s and set %s should match", \
(_set1_)->name(), (_set2_)->name())); \
} while (0)
// This class represents heap region sets whose members are not
// explicitly tracked. It's helpful to group regions using such sets
// so that we can reason about all the region groups in the heap using
// the same interface (namely, the HeapRegionSetBase API).
class HeapRegionSet : public HeapRegionSetBase {
protected:
virtual const char* verify_region_extra(HeapRegion* hr) {
if (hr->next() != NULL) {
return "next() should always be NULL as we do not link the regions";
}
return HeapRegionSetBase::verify_region_extra(hr);
}
HeapRegionSet(const char* name) : HeapRegionSetBase(name) {
clear();
}
public:
// It adds hr to the set. The region should not be a member of
// another set.
inline void add(HeapRegion* hr);
// It removes hr from the set. The region should be a member of
// this set.
inline void remove(HeapRegion* hr);
// It removes a region from the set. Instead of updating the fields
// of the set to reflect this removal, it accumulates the updates
// in proxy_set. The idea is that proxy_set is thread-local to
// avoid multiple threads updating the fields of the set
// concurrently and having to synchronize. The method
// update_from_proxy() will update the fields of the set from the
// proxy_set.
inline void remove_with_proxy(HeapRegion* hr, HeapRegionSet* proxy_set);
// After multiple calls to remove_with_proxy() the updates to the
// fields of the set are accumulated in proxy_set. This call
// updates the fields of the set from proxy_set.
void update_from_proxy(HeapRegionSet* proxy_set);
};
//////////////////// HeapRegionLinkedList ////////////////////
// A set that links all the regions added to it in a singly-linked
// list. We should try to avoid doing operations that iterate over
// such lists in performance critical paths. Typically we should
// add / remove one region at a time or concatenate two lists. All
// those operations are done in constant time.
class HeapRegionLinkedListIterator;
class HeapRegionLinkedList : public HeapRegionSetBase {
friend class HeapRegionLinkedListIterator;
private:
HeapRegion* _head;
HeapRegion* _tail;
// These are provided for use by the friend classes.
HeapRegion* head() { return _head; }
HeapRegion* tail() { return _tail; }
protected:
virtual void fill_in_ext_msg_extra(hrl_ext_msg* msg);
// See the comment for HeapRegionSetBase::clear()
virtual void clear();
HeapRegionLinkedList(const char* name) : HeapRegionSetBase(name) {
clear();
}
public:
// It adds hr to the list as the new tail. The region should not be
// a member of another set.
inline void add_as_tail(HeapRegion* hr);
// It removes and returns the head of the list. It assumes that the
// list is not empty so it will return a non-NULL value.
inline HeapRegion* remove_head();
// Convenience method.
inline HeapRegion* remove_head_or_null();
// It moves the regions from from_list to this list and empties
// from_list. The new regions will appear in the same order as they
// were in from_list and be linked in the end of this list.
void add_as_tail(HeapRegionLinkedList* from_list);
// It empties the list by removing all regions from it.
void remove_all();
// It removes all regions in the list that are pending for removal
// (i.e., they have been tagged with "pending_removal"). The list
// must not be empty, target_count should reflect the exact number
// of regions that are pending for removal in the list, and
// target_count should be > 1 (currently, we never need to remove a
// single region using this).
void remove_all_pending(size_t target_count);
virtual void verify();
virtual void print_on(outputStream* out, bool print_contents = false);
};
//////////////////// HeapRegionLinkedList ////////////////////
// Iterator class that provides a convenient way to iterator over the
// regions in a HeapRegionLinkedList instance.
class HeapRegionLinkedListIterator : public StackObj {
private:
HeapRegionLinkedList* _list;
HeapRegion* _curr;
public:
bool more_available() {
return _curr != NULL;
}
HeapRegion* get_next() {
assert(more_available(),
"get_next() should be called when more regions are available");
// If we are going to introduce a count in the iterator we should
// do the "cycle" check.
HeapRegion* hr = _curr;
assert(_list->verify_region(hr, _list), "region verification");
_curr = hr->next();
return hr;
}
HeapRegionLinkedListIterator(HeapRegionLinkedList* list)
: _curr(NULL), _list(list) {
_curr = list->head();
}
};
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP
src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp 0 → 100644
浏览文件 @ fda06608
/*
* copyright (c) 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.
*
*/
#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
#include "gc_implementation/g1/heapRegionSet.hpp"
//////////////////// HeapRegionSetBase ////////////////////
inline void HeapRegionSetBase::update_for_addition(HeapRegion* hr) {
// Assumes the caller has already verified the region.
_length += 1;
if (!hr->isHumongous()) {
_region_num += 1;
} else {
_region_num += calculate_region_num(hr);
}
_total_used_bytes += hr->used();
}
inline void HeapRegionSetBase::add_internal(HeapRegion* hr) {
hrl_assert_region_ok(this, hr, NULL);
assert(hr->next() == NULL, hrl_ext_msg(this, "should not already be linked"));
update_for_addition(hr);
hr->set_containing_set(this);
}
inline void HeapRegionSetBase::update_for_removal(HeapRegion* hr) {
// Assumes the caller has already verified the region.
assert(_length > 0, hrl_ext_msg(this, "pre-condition"));
_length -= 1;
size_t region_num_diff;
if (!hr->isHumongous()) {
region_num_diff = 1;
} else {
region_num_diff = calculate_region_num(hr);
}
assert(region_num_diff <= _region_num,
hrl_err_msg("[%s] region's region num: "SIZE_FORMAT" "
"should be <= region num: "SIZE_FORMAT,
name(), region_num_diff, _region_num));
_region_num -= region_num_diff;
size_t used_bytes = hr->used();
assert(used_bytes <= _total_used_bytes,
hrl_err_msg("[%s] region's used bytes: "SIZE_FORMAT" "
"should be <= used bytes: "SIZE_FORMAT,
name(), used_bytes, _total_used_bytes));
_total_used_bytes -= used_bytes;
}
inline void HeapRegionSetBase::remove_internal(HeapRegion* hr) {
hrl_assert_region_ok(this, hr, this);
assert(hr->next() == NULL, hrl_ext_msg(this, "should already be unlinked"));
hr->set_containing_set(NULL);
update_for_removal(hr);
}
//////////////////// HeapRegionSet ////////////////////
inline void HeapRegionSet::add(HeapRegion* hr) {
hrl_assert_mt_safety_ok(this);
// add_internal() will verify the region.
add_internal(hr);
}
inline void HeapRegionSet::remove(HeapRegion* hr) {
hrl_assert_mt_safety_ok(this);
// remove_internal() will verify the region.
remove_internal(hr);
}
inline void HeapRegionSet::remove_with_proxy(HeapRegion* hr,
HeapRegionSet* proxy_set) {
// No need to fo the MT safety check here given that this method
// does not update the contents of the set but instead accumulates
// the changes in proxy_set which is assumed to be thread-local.
hrl_assert_sets_match(this, proxy_set);
hrl_assert_region_ok(this, hr, this);
hr->set_containing_set(NULL);
proxy_set->update_for_addition(hr);
}
//////////////////// HeapRegionLinkedList ////////////////////
inline void HeapRegionLinkedList::add_as_tail(HeapRegion* hr) {
hrl_assert_mt_safety_ok(this);
assert((length() == 0 && _head == NULL && _tail == NULL) ||
(length() > 0 && _head != NULL && _tail != NULL),
hrl_ext_msg(this, "invariant"));
// add_internal() will verify the region.
add_internal(hr);
// Now link the region.
if (_tail != NULL) {
_tail->set_next(hr);
} else {
_head = hr;
}
_tail = hr;
}
inline HeapRegion* HeapRegionLinkedList::remove_head() {
hrl_assert_mt_safety_ok(this);
assert(!is_empty(), hrl_ext_msg(this, "the list should not be empty"));
assert(length() > 0 && _head != NULL && _tail != NULL,
hrl_ext_msg(this, "invariant"));
// We need to unlink it first.
HeapRegion* hr = _head;
_head = hr->next();
if (_head == NULL) {
_tail = NULL;
}
hr->set_next(NULL);
// remove_internal() will verify the region.
remove_internal(hr);
return hr;
}
inline HeapRegion* HeapRegionLinkedList::remove_head_or_null() {
hrl_assert_mt_safety_ok(this);
if (!is_empty()) {
return remove_head();
} else {
return NULL;
}
}
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
src/share/vm/gc_implementation/g1/heapRegionSets.cpp 0 → 100644
浏览文件 @ fda06608
此差异已折叠。
src/share/vm/gc_implementation/g1/ptrQueue.cpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -38,8 +38,8 @@
# include "thread_windows.inline.hpp"
#endif
PtrQueue::PtrQueue(PtrQueueSet* qset_, bool perm, bool active) :
_qset(qset_), _buf(NULL), _index(0), _active(active),
PtrQueue::PtrQueue(PtrQueueSet* qset, bool perm, bool active) :
_qset(qset), _buf(NULL), _index(0), _active(active),
_perm(perm), _lock(NULL)
{}
......@@ -153,10 +153,16 @@ void PtrQueueSet::reduce_free_list() {
}
void PtrQueue::handle_zero_index() {
assert(0 == _index, "Precondition.");
assert(_index == 0, "Precondition.");
// This thread records the full buffer and allocates a new one (while
// holding the lock if there is one).
if (_buf != NULL) {
if (!should_enqueue_buffer()) {
assert(_index > 0, "the buffer can only be re-used if it's not full");
return;
}
if (_lock) {
assert(_lock->owned_by_self(), "Required.");
......
src/share/vm/gc_implementation/g1/ptrQueue.hpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -68,7 +68,7 @@ protected:
public:
// Initialize this queue to contain a null buffer, and be part of the
// given PtrQueueSet.
PtrQueue(PtrQueueSet*, bool perm = false, bool active = false);
PtrQueue(PtrQueueSet* qset, bool perm = false, bool active = false);
// Release any contained resources.
void flush();
// Calls flush() when destroyed.
......@@ -85,6 +85,14 @@ public:
else enqueue_known_active(ptr);
}
// This method is called when we're doing the zero index handling
// and gives a chance to the queues to do any pre-enqueueing
// processing they might want to do on the buffer. It should return
// true if the buffer should be enqueued, or false if enough
// entries were cleared from it so that it can be re-used. It should
// not return false if the buffer is still full (otherwise we can
// get into an infinite loop).
virtual bool should_enqueue_buffer() { return true; }
void handle_zero_index();
void locking_enqueue_completed_buffer(void** buf);
......
src/share/vm/gc_implementation/g1/satbQueue.hpp
浏览文件 @ fda06608
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* 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
......@@ -33,13 +33,18 @@ class JavaThread;
// A ptrQueue whose elements are "oops", pointers to object heads.
class ObjPtrQueue: public PtrQueue {
public:
ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) :
ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
// SATB queues are only active during marking cycles. We create
// them with their active field set to false. If a thread is
// created during a cycle and its SATB queue needs to be activated
// before the thread starts running, we'll need to set its active
// field to true. This is done in JavaThread::initialize_queues().
PtrQueue(qset_, perm, false /* active */) { }
PtrQueue(qset, perm, false /* active */) { }
// Overrides PtrQueue::should_enqueue_buffer(). See the method's
// definition for more information.
virtual bool should_enqueue_buffer();
// Apply the closure to all elements, and reset the index to make the
// buffer empty.
void apply_closure(ObjectClosure* cl);
......
src/share/vm/utilities/debug.hpp
浏览文件 @ fda06608
此差异已折叠。
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