aoqi@0: /*
mlarsson@7686:  * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP
aoqi@0: #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP
aoqi@0: 
aoqi@0: #include "gc_implementation/g1/concurrentMark.hpp"
aoqi@0: #include "gc_implementation/g1/g1CollectedHeap.hpp"
aoqi@0: #include "gc_implementation/g1/g1AllocRegion.inline.hpp"
aoqi@0: #include "gc_implementation/g1/g1CollectorPolicy.hpp"
aoqi@0: #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
tschatzl@7091: #include "gc_implementation/g1/heapRegionManager.inline.hpp"
aoqi@0: #include "gc_implementation/g1/heapRegionSet.inline.hpp"
goetz@6911: #include "runtime/orderAccess.inline.hpp"
aoqi@0: #include "utilities/taskqueue.hpp"
aoqi@0: 
tschatzl@7651: PLABStats* G1CollectedHeap::alloc_buffer_stats(InCSetState dest) {
tschatzl@7651:   switch (dest.value()) {
tschatzl@7651:     case InCSetState::Young:
tschatzl@7651:       return &_survivor_plab_stats;
tschatzl@7651:     case InCSetState::Old:
tschatzl@7651:       return &_old_plab_stats;
tschatzl@7651:     default:
tschatzl@7651:       ShouldNotReachHere();
tschatzl@7651:       return NULL; // Keep some compilers happy
tschatzl@7651:   }
tschatzl@7651: }
tschatzl@7651: 
tschatzl@7651: size_t G1CollectedHeap::desired_plab_sz(InCSetState dest) {
tschatzl@7651:   size_t gclab_word_size = alloc_buffer_stats(dest)->desired_plab_sz();
tschatzl@7651:   // Prevent humongous PLAB sizes for two reasons:
tschatzl@7651:   // * PLABs are allocated using a similar paths as oops, but should
tschatzl@7651:   //   never be in a humongous region
tschatzl@7651:   // * Allowing humongous PLABs needlessly churns the region free lists
tschatzl@7651:   return MIN2(_humongous_object_threshold_in_words, gclab_word_size);
tschatzl@7651: }
tschatzl@7651: 
tschatzl@7651: HeapWord* G1CollectedHeap::par_allocate_during_gc(InCSetState dest,
tschatzl@7651:                                                   size_t word_size,
tschatzl@7651:                                                   AllocationContext_t context) {
tschatzl@7651:   switch (dest.value()) {
tschatzl@7651:     case InCSetState::Young:
tschatzl@7651:       return survivor_attempt_allocation(word_size, context);
tschatzl@7651:     case InCSetState::Old:
tschatzl@7651:       return old_attempt_allocation(word_size, context);
tschatzl@7651:     default:
tschatzl@7651:       ShouldNotReachHere();
tschatzl@7651:       return NULL; // Keep some compilers happy
tschatzl@7651:   }
tschatzl@7651: }
tschatzl@7651: 
aoqi@0: // Inline functions for G1CollectedHeap
aoqi@0: 
jcoomes@7159: inline AllocationContextStats& G1CollectedHeap::allocation_context_stats() {
jcoomes@7159:   return _allocation_context_stats;
jcoomes@7159: }
jcoomes@7159: 
aoqi@0: // Return the region with the given index. It assumes the index is valid.
tschatzl@7091: inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrm.at(index); }
drchase@6680: 
tschatzl@7010: inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const {
tschatzl@7010:   assert(is_in_reserved(addr),
kevinw@9327:          err_msg("Cannot calculate region index for address " PTR_FORMAT " that is outside of the heap [" PTR_FORMAT ", " PTR_FORMAT ")",
tschatzl@7010:                  p2i(addr), p2i(_reserved.start()), p2i(_reserved.end())));
tschatzl@7010:   return (uint)(pointer_delta(addr, _reserved.start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes);
tschatzl@7010: }
tschatzl@7010: 
tschatzl@7050: inline HeapWord* G1CollectedHeap::bottom_addr_for_region(uint index) const {
tschatzl@7091:   return _hrm.reserved().start() + index * HeapRegion::GrainWords;
tschatzl@7050: }
aoqi@0: 
aoqi@0: template <class T>
tschatzl@7050: inline HeapRegion* G1CollectedHeap::heap_region_containing_raw(const T addr) const {
brutisso@7049:   assert(addr != NULL, "invariant");
tschatzl@7050:   assert(is_in_g1_reserved((const void*) addr),
kevinw@9327:       err_msg("Address " PTR_FORMAT " is outside of the heap ranging from [" PTR_FORMAT " to " PTR_FORMAT ")",
tschatzl@7050:           p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end())));
tschatzl@7091:   return _hrm.addr_to_region((HeapWord*) addr);
drchase@6680: }
drchase@6680: 
drchase@6680: template <class T>
tschatzl@7050: inline HeapRegion* G1CollectedHeap::heap_region_containing(const T addr) const {
brutisso@7049:   HeapRegion* hr = heap_region_containing_raw(addr);
brutisso@7049:   if (hr->continuesHumongous()) {
brutisso@7049:     return hr->humongous_start_region();
aoqi@0:   }
aoqi@0:   return hr;
aoqi@0: }
aoqi@0: 
goetz@6911: inline void G1CollectedHeap::reset_gc_time_stamp() {
goetz@6911:   _gc_time_stamp = 0;
goetz@6911:   OrderAccess::fence();
goetz@6911:   // Clear the cached CSet starting regions and time stamps.
goetz@6911:   // Their validity is dependent on the GC timestamp.
goetz@6911:   clear_cset_start_regions();
goetz@6911: }
goetz@6911: 
goetz@6911: inline void G1CollectedHeap::increment_gc_time_stamp() {
goetz@6911:   ++_gc_time_stamp;
goetz@6911:   OrderAccess::fence();
aoqi@0: }
aoqi@0: 
aoqi@0: inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {
aoqi@0:   _old_set.remove(hr);
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool G1CollectedHeap::obj_in_cs(oop obj) {
tschatzl@7091:   HeapRegion* r = _hrm.addr_to_region((HeapWord*) obj);
aoqi@0:   return r != NULL && r->in_collection_set();
aoqi@0: }
aoqi@0: 
tschatzl@7050: inline HeapWord* G1CollectedHeap::attempt_allocation(size_t word_size,
mlarsson@7686:                                                      uint* gc_count_before_ret,
mlarsson@7686:                                                      uint* gclocker_retry_count_ret) {
aoqi@0:   assert_heap_not_locked_and_not_at_safepoint();
aoqi@0:   assert(!isHumongous(word_size), "attempt_allocation() should not "
aoqi@0:          "be called for humongous allocation requests");
aoqi@0: 
sjohanss@7118:   AllocationContext_t context = AllocationContext::current();
sjohanss@7118:   HeapWord* result = _allocator->mutator_alloc_region(context)->attempt_allocation(word_size,
sjohanss@7118:                                                                                    false /* bot_updates */);
aoqi@0:   if (result == NULL) {
aoqi@0:     result = attempt_allocation_slow(word_size,
sjohanss@7118:                                      context,
aoqi@0:                                      gc_count_before_ret,
aoqi@0:                                      gclocker_retry_count_ret);
aoqi@0:   }
aoqi@0:   assert_heap_not_locked();
aoqi@0:   if (result != NULL) {
aoqi@0:     dirty_young_block(result, word_size);
aoqi@0:   }
aoqi@0:   return result;
aoqi@0: }
aoqi@0: 
sjohanss@7118: inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t word_size,
sjohanss@7118:                                                               AllocationContext_t context) {
aoqi@0:   assert(!isHumongous(word_size),
aoqi@0:          "we should not be seeing humongous-size allocations in this path");
aoqi@0: 
sjohanss@7118:   HeapWord* result = _allocator->survivor_gc_alloc_region(context)->attempt_allocation(word_size,
sjohanss@7118:                                                                                        false /* bot_updates */);
aoqi@0:   if (result == NULL) {
aoqi@0:     MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
sjohanss@7118:     result = _allocator->survivor_gc_alloc_region(context)->attempt_allocation_locked(word_size,
sjohanss@7118:                                                                                       false /* bot_updates */);
aoqi@0:   }
aoqi@0:   if (result != NULL) {
aoqi@0:     dirty_young_block(result, word_size);
aoqi@0:   }
aoqi@0:   return result;
aoqi@0: }
aoqi@0: 
sjohanss@7118: inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size,
sjohanss@7118:                                                          AllocationContext_t context) {
aoqi@0:   assert(!isHumongous(word_size),
aoqi@0:          "we should not be seeing humongous-size allocations in this path");
aoqi@0: 
sjohanss@7118:   HeapWord* result = _allocator->old_gc_alloc_region(context)->attempt_allocation(word_size,
sjohanss@7118:                                                                                   true /* bot_updates */);
aoqi@0:   if (result == NULL) {
aoqi@0:     MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
sjohanss@7118:     result = _allocator->old_gc_alloc_region(context)->attempt_allocation_locked(word_size,
sjohanss@7118:                                                                                  true /* bot_updates */);
aoqi@0:   }
aoqi@0:   return result;
aoqi@0: }
aoqi@0: 
aoqi@0: // It dirties the cards that cover the block so that so that the post
aoqi@0: // write barrier never queues anything when updating objects on this
aoqi@0: // block. It is assumed (and in fact we assert) that the block
aoqi@0: // belongs to a young region.
aoqi@0: inline void
aoqi@0: G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {
aoqi@0:   assert_heap_not_locked();
aoqi@0: 
aoqi@0:   // Assign the containing region to containing_hr so that we don't
aoqi@0:   // have to keep calling heap_region_containing_raw() in the
aoqi@0:   // asserts below.
aoqi@0:   DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);)
brutisso@7049:   assert(word_size > 0, "pre-condition");
aoqi@0:   assert(containing_hr->is_in(start), "it should contain start");
aoqi@0:   assert(containing_hr->is_young(), "it should be young");
aoqi@0:   assert(!containing_hr->isHumongous(), "it should not be humongous");
aoqi@0: 
aoqi@0:   HeapWord* end = start + word_size;
aoqi@0:   assert(containing_hr->is_in(end - 1), "it should also contain end - 1");
aoqi@0: 
aoqi@0:   MemRegion mr(start, end);
aoqi@0:   g1_barrier_set()->g1_mark_as_young(mr);
aoqi@0: }
aoqi@0: 
aoqi@0: inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const {
aoqi@0:   return _task_queues->queue(i);
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool G1CollectedHeap::isMarkedPrev(oop obj) const {
aoqi@0:   return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj);
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool G1CollectedHeap::isMarkedNext(oop obj) const {
aoqi@0:   return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj);
aoqi@0: }
aoqi@0: 
aoqi@0: // This is a fast test on whether a reference points into the
aoqi@0: // collection set or not. Assume that the reference
aoqi@0: // points into the heap.
tschatzl@7010: inline bool G1CollectedHeap::is_in_cset(oop obj) {
tschatzl@7010:   bool ret = _in_cset_fast_test.is_in_cset((HeapWord*)obj);
aoqi@0:   // let's make sure the result is consistent with what the slower
aoqi@0:   // test returns
aoqi@0:   assert( ret || !obj_in_cs(obj), "sanity");
aoqi@0:   assert(!ret ||  obj_in_cs(obj), "sanity");
aoqi@0:   return ret;
aoqi@0: }
aoqi@0: 
tschatzl@7010: bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) {
tschatzl@7010:   return _in_cset_fast_test.is_in_cset_or_humongous((HeapWord*)obj);
tschatzl@7010: }
tschatzl@7010: 
tschatzl@7651: InCSetState G1CollectedHeap::in_cset_state(const oop obj) {
tschatzl@7010:   return _in_cset_fast_test.at((HeapWord*)obj);
tschatzl@7010: }
tschatzl@7010: 
tschatzl@7010: void G1CollectedHeap::register_humongous_region_with_in_cset_fast_test(uint index) {
tschatzl@7010:   _in_cset_fast_test.set_humongous(index);
tschatzl@7010: }
tschatzl@7010: 
aoqi@0: #ifndef PRODUCT
aoqi@0: // Support for G1EvacuationFailureALot
aoqi@0: 
aoqi@0: inline bool
aoqi@0: G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young,
aoqi@0:                                                      bool during_initial_mark,
aoqi@0:                                                      bool during_marking) {
aoqi@0:   bool res = false;
aoqi@0:   if (during_marking) {
aoqi@0:     res |= G1EvacuationFailureALotDuringConcMark;
aoqi@0:   }
aoqi@0:   if (during_initial_mark) {
aoqi@0:     res |= G1EvacuationFailureALotDuringInitialMark;
aoqi@0:   }
aoqi@0:   if (gcs_are_young) {
aoqi@0:     res |= G1EvacuationFailureALotDuringYoungGC;
aoqi@0:   } else {
aoqi@0:     // GCs are mixed
aoqi@0:     res |= G1EvacuationFailureALotDuringMixedGC;
aoqi@0:   }
aoqi@0:   return res;
aoqi@0: }
aoqi@0: 
aoqi@0: inline void
aoqi@0: G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {
aoqi@0:   if (G1EvacuationFailureALot) {
aoqi@0:     // Note we can't assert that _evacuation_failure_alot_for_current_gc
aoqi@0:     // is clear here. It may have been set during a previous GC but that GC
aoqi@0:     // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to
aoqi@0:     // trigger an evacuation failure and clear the flags and and counts.
aoqi@0: 
aoqi@0:     // Check if we have gone over the interval.
aoqi@0:     const size_t gc_num = total_collections();
aoqi@0:     const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;
aoqi@0: 
aoqi@0:     _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);
aoqi@0: 
aoqi@0:     // Now check if G1EvacuationFailureALot is enabled for the current GC type.
aoqi@0:     const bool gcs_are_young = g1_policy()->gcs_are_young();
aoqi@0:     const bool during_im = g1_policy()->during_initial_mark_pause();
aoqi@0:     const bool during_marking = mark_in_progress();
aoqi@0: 
aoqi@0:     _evacuation_failure_alot_for_current_gc &=
aoqi@0:       evacuation_failure_alot_for_gc_type(gcs_are_young,
aoqi@0:                                           during_im,
aoqi@0:                                           during_marking);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
tschatzl@7050: inline bool G1CollectedHeap::evacuation_should_fail() {
aoqi@0:   if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {
aoqi@0:     return false;
aoqi@0:   }
aoqi@0:   // G1EvacuationFailureALot is in effect for current GC
aoqi@0:   // Access to _evacuation_failure_alot_count is not atomic;
aoqi@0:   // the value does not have to be exact.
aoqi@0:   if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {
aoqi@0:     return false;
aoqi@0:   }
aoqi@0:   _evacuation_failure_alot_count = 0;
aoqi@0:   return true;
aoqi@0: }
aoqi@0: 
aoqi@0: inline void G1CollectedHeap::reset_evacuation_should_fail() {
aoqi@0:   if (G1EvacuationFailureALot) {
aoqi@0:     _evacuation_failure_alot_gc_number = total_collections();
aoqi@0:     _evacuation_failure_alot_count = 0;
aoqi@0:     _evacuation_failure_alot_for_current_gc = false;
aoqi@0:   }
aoqi@0: }
aoqi@0: #endif  // #ifndef PRODUCT
aoqi@0: 
aoqi@0: inline bool G1CollectedHeap::is_in_young(const oop obj) {
brutisso@7049:   if (obj == NULL) {
brutisso@7049:     return false;
brutisso@7049:   }
brutisso@7049:   return heap_region_containing(obj)->is_young();
aoqi@0: }
aoqi@0: 
aoqi@0: // We don't need barriers for initializing stores to objects
aoqi@0: // in the young gen: for the SATB pre-barrier, there is no
aoqi@0: // pre-value that needs to be remembered; for the remembered-set
aoqi@0: // update logging post-barrier, we don't maintain remembered set
aoqi@0: // information for young gen objects.
aoqi@0: inline bool G1CollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
aoqi@0:   return is_in_young(new_obj);
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool G1CollectedHeap::is_obj_dead(const oop obj) const {
brutisso@7049:   if (obj == NULL) {
brutisso@7049:     return false;
aoqi@0:   }
brutisso@7049:   return is_obj_dead(obj, heap_region_containing(obj));
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool G1CollectedHeap::is_obj_ill(const oop obj) const {
brutisso@7049:   if (obj == NULL) {
brutisso@7049:     return false;
aoqi@0:   }
brutisso@7049:   return is_obj_ill(obj, heap_region_containing(obj));
aoqi@0: }
aoqi@0: 
kbarrett@7830: inline void G1CollectedHeap::set_humongous_reclaim_candidate(uint region, bool value) {
kbarrett@7830:   assert(_hrm.at(region)->startsHumongous(), "Must start a humongous object");
kbarrett@7830:   _humongous_reclaim_candidates.set_candidate(region, value);
kbarrett@7830: }
kbarrett@7830: 
kbarrett@7830: inline bool G1CollectedHeap::is_humongous_reclaim_candidate(uint region) {
kbarrett@7830:   assert(_hrm.at(region)->startsHumongous(), "Must start a humongous object");
kbarrett@7830:   return _humongous_reclaim_candidates.is_candidate(region);
kbarrett@7830: }
kbarrett@7830: 
tschatzl@7010: inline void G1CollectedHeap::set_humongous_is_live(oop obj) {
tschatzl@7010:   uint region = addr_to_region((HeapWord*)obj);
kbarrett@7830:   // Clear the flag in the humongous_reclaim_candidates table.  Also
tschatzl@7010:   // reset the entry in the _in_cset_fast_test table so that subsequent references
tschatzl@7010:   // to the same humongous object do not go into the slow path again.
tschatzl@7010:   // This is racy, as multiple threads may at the same time enter here, but this
tschatzl@7010:   // is benign.
kbarrett@7830:   // During collection we only ever clear the "candidate" flag, and only ever clear the
tschatzl@7010:   // entry in the in_cset_fast_table.
tschatzl@7010:   // We only ever evaluate the contents of these tables (in the VM thread) after
tschatzl@7010:   // having synchronized the worker threads with the VM thread, or in the same
tschatzl@7010:   // thread (i.e. within the VM thread).
kbarrett@7830:   if (is_humongous_reclaim_candidate(region)) {
kbarrett@7830:     set_humongous_reclaim_candidate(region, false);
tschatzl@7010:     _in_cset_fast_test.clear_humongous(region);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP