mirror of
https://github.com/darlinghq/darling-bmalloc.git
synced 2024-11-23 12:29:43 +00:00
85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "BInline.h"
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#include "IsoDeallocator.h"
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#include "IsoPage.h"
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#include "IsoSharedPage.h"
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#include "Mutex.h"
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#include <mutex>
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namespace bmalloc {
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template<typename Config>
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IsoDeallocator<Config>::IsoDeallocator(Mutex& lock)
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: m_lock(&lock)
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{
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}
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template<typename Config>
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IsoDeallocator<Config>::~IsoDeallocator()
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{
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}
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template<typename Config>
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template<typename Type>
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void IsoDeallocator<Config>::deallocate(api::IsoHeap<Type>& handle, void* ptr)
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{
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static constexpr bool verbose = false;
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if (verbose)
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fprintf(stderr, "%p: deallocating %p of size %u\n", &IsoPage<Config>::pageFor(ptr)->heap(), ptr, Config::objectSize);
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// For allocation from shared pages, we deallocate immediately rather than batching deallocations with object log.
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// The batching delays the reclamation of the shared cells, which can make allocator mistakenly think that "we exhaust shared
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// cells because this is allocated a lot". Since the number of shared cells are limited, this immediate deallocation path
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// should be rarely taken. If we see frequent malloc-and-free pattern, we tier up the allocator from shared mode to fast mode.
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IsoPageBase* page = IsoPageBase::pageFor(ptr);
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if (page->isShared()) {
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LockHolder locker(*m_lock);
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static_cast<IsoSharedPage*>(page)->free<Config>(locker, handle, ptr);
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return;
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}
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if (m_objectLog.size() == m_objectLog.capacity())
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scavenge();
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m_objectLog.push(ptr);
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}
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template<typename Config>
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BNO_INLINE void IsoDeallocator<Config>::scavenge()
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{
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LockHolder locker(*m_lock);
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for (void* ptr : m_objectLog)
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IsoPage<Config>::pageFor(ptr)->free(locker, ptr);
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m_objectLog.clear();
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}
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} // namespace bmalloc
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