| /* |
| * Copyright (C) 2017 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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. |
| */ |
| |
| #pragma once |
| |
| #include "BInline.h" |
| #include "IsoDeallocator.h" |
| #include "IsoPage.h" |
| #include "IsoSharedPage.h" |
| #include "Mutex.h" |
| #include <mutex> |
| |
| namespace bmalloc { |
| |
| template<typename Config> |
| IsoDeallocator<Config>::IsoDeallocator(Mutex& lock) |
| : m_lock(&lock) |
| { |
| } |
| |
| template<typename Config> |
| IsoDeallocator<Config>::~IsoDeallocator() |
| { |
| } |
| |
| template<typename Config> |
| template<typename Type> |
| void IsoDeallocator<Config>::deallocate(api::IsoHeap<Type>& handle, void* ptr) |
| { |
| static constexpr bool verbose = false; |
| if (verbose) |
| fprintf(stderr, "%p: deallocating %p of size %u\n", &IsoPage<Config>::pageFor(ptr)->heap(), ptr, Config::objectSize); |
| |
| // For allocation from shared pages, we deallocate immediately rather than batching deallocations with object log. |
| // The batching delays the reclamation of the shared cells, which can make allocator mistakenly think that "we exhaust shared |
| // cells because this is allocated a lot". Since the number of shared cells are limited, this immediate deallocation path |
| // should be rarely taken. If we see frequent malloc-and-free pattern, we tier up the allocator from shared mode to fast mode. |
| IsoPageBase* page = IsoPageBase::pageFor(ptr); |
| if (page->isShared()) { |
| std::lock_guard<Mutex> locker(*m_lock); |
| static_cast<IsoSharedPage*>(page)->free<Config>(locker, handle, ptr); |
| return; |
| } |
| |
| if (m_objectLog.size() == m_objectLog.capacity()) |
| scavenge(); |
| |
| m_objectLog.push(ptr); |
| } |
| |
| template<typename Config> |
| BNO_INLINE void IsoDeallocator<Config>::scavenge() |
| { |
| std::lock_guard<Mutex> locker(*m_lock); |
| |
| for (void* ptr : m_objectLog) |
| IsoPage<Config>::pageFor(ptr)->free(ptr); |
| m_objectLog.clear(); |
| } |
| |
| } // namespace bmalloc |
| |