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https://github.com/EQEmu/Server.git
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108 lines
2.3 KiB
C++
108 lines
2.3 KiB
C++
/* EQEmu: EQEmulator
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Copyright (C) 2001-2026 EQEmu Development Team
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "common/eqemu_logsys.h"
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class PageAlignedAllocatorBase
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{
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protected:
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void* allocateInternal(size_t amount, size_t alignment);
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size_t getPageSize() const;
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};
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// Page-aligned allocator for std::vector
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template <typename T>
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class PageAlignedAllocator : public PageAlignedAllocatorBase
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{
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public:
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using value_type = T;
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PageAlignedAllocator() noexcept = default;
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template <typename U>
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PageAlignedAllocator(const PageAlignedAllocator<U>&) noexcept {}
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T* allocate(std::size_t n)
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{
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size_t size = n * sizeof(T);
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return static_cast<T*>(allocateInternal(size, getPageSize()));
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}
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void deallocate(T* p, std::size_t) noexcept
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{
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free(p);
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}
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};
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template <typename T, typename U>
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bool operator==(const PageAlignedAllocator<T>&, const PageAlignedAllocator<U>&) noexcept {
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return true;
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}
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template <typename T, typename U>
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bool operator!=(const PageAlignedAllocator<T>&, const PageAlignedAllocator<U>&) noexcept {
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return false;
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}
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// Kernel Samepage Merging (KSM) functionality
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namespace KSM {
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#ifdef _WIN32
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// Windows-specific placeholder functions (no-op)
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inline void CheckPageAlignment(void* ptr)
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{
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}
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inline void* AllocatePageAligned(size_t size)
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{
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return memset(malloc(size), 0, size);
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}
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inline void MarkMemoryForKSM(void* start, size_t size)
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{
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}
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inline void AlignHeapToPageBoundary()
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{
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}
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inline void* MarkHeapStart()
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{
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return nullptr;
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}
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inline size_t MeasureHeapUsage(void* start)
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{
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return 0;
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}
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#else
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void CheckPageAlignment(void* ptr);
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void* AllocatePageAligned(size_t size);
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void MarkMemoryForKSM(void* start, size_t size);
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void AlignHeapToPageBoundary();
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void* MarkHeapStart();
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size_t MeasureHeapUsage(void* start);
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#endif
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}
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