v8/src/incremental-marking-inl.h
erik.corry@gmail.com cd8d915c72 Clean up the marking speed heuristics. This reduces the
max heap size on 64 bit from ca. 300Mbytes to ca. 200Mbytes
on Ulan's splay variant.  On 32 bit not much change.
Review URL: http://codereview.chromium.org/8494012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9906 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-11-08 10:28:58 +00:00

134 lines
4.8 KiB
C++

// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_INCREMENTAL_MARKING_INL_H_
#define V8_INCREMENTAL_MARKING_INL_H_
#include "incremental-marking.h"
namespace v8 {
namespace internal {
bool IncrementalMarking::BaseRecordWrite(HeapObject* obj,
Object** slot,
Object* value) {
MarkBit value_bit = Marking::MarkBitFrom(HeapObject::cast(value));
if (Marking::IsWhite(value_bit)) {
MarkBit obj_bit = Marking::MarkBitFrom(obj);
if (Marking::IsBlack(obj_bit)) {
BlackToGreyAndUnshift(obj, obj_bit);
RestartIfNotMarking();
}
// Object is either grey or white. It will be scanned if survives.
return false;
}
return true;
}
void IncrementalMarking::RecordWrite(HeapObject* obj,
Object** slot,
Object* value) {
if (IsMarking() && value->NonFailureIsHeapObject()) {
RecordWriteSlow(obj, slot, value);
}
}
void IncrementalMarking::RecordWriteOfCodeEntry(JSFunction* host,
Object** slot,
Code* value) {
if (IsMarking()) RecordWriteOfCodeEntrySlow(host, slot, value);
}
void IncrementalMarking::RecordWriteIntoCode(HeapObject* obj,
RelocInfo* rinfo,
Object* value) {
if (IsMarking() && value->NonFailureIsHeapObject()) {
RecordWriteIntoCodeSlow(obj, rinfo, value);
}
}
void IncrementalMarking::RecordWrites(HeapObject* obj) {
if (IsMarking()) {
MarkBit obj_bit = Marking::MarkBitFrom(obj);
if (Marking::IsBlack(obj_bit)) {
BlackToGreyAndUnshift(obj, obj_bit);
RestartIfNotMarking();
}
}
}
void IncrementalMarking::BlackToGreyAndUnshift(HeapObject* obj,
MarkBit mark_bit) {
ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
ASSERT(obj->Size() >= 2*kPointerSize);
ASSERT(IsMarking());
Marking::BlackToGrey(mark_bit);
int obj_size = obj->Size();
MemoryChunk::IncrementLiveBytes(obj->address(), -obj_size);
bytes_scanned_ -= obj_size;
int64_t old_bytes_rescanned = bytes_rescanned_;
bytes_rescanned_ = old_bytes_rescanned + obj_size;
if ((bytes_rescanned_ >> 20) != (old_bytes_rescanned >> 20)) {
if (bytes_rescanned_ > 2 * heap_->PromotedSpaceSize()) {
// If we have queued twice the heap size for rescanning then we are
// going around in circles, scanning the same objects again and again
// as the program mutates the heap faster than we can incrementally
// trace it. In this case we switch to non-incremental marking in
// order to finish off this marking phase.
if (FLAG_trace_gc) {
PrintF("Hurrying incremental marking because of lack of progress\n");
}
allocation_marking_factor_ = kMaxAllocationMarkingFactor;
}
}
marking_deque_.UnshiftGrey(obj);
}
void IncrementalMarking::WhiteToGreyAndPush(HeapObject* obj, MarkBit mark_bit) {
WhiteToGrey(obj, mark_bit);
marking_deque_.PushGrey(obj);
}
void IncrementalMarking::WhiteToGrey(HeapObject* obj, MarkBit mark_bit) {
Marking::WhiteToGrey(mark_bit);
}
} } // namespace v8::internal
#endif // V8_INCREMENTAL_MARKING_INL_H_