Warning fixes, general cleanup (#5053)

common/memory/ksm.h

@@ -0,0 +1,74 @@
+/*	EQEmu: EQEmulator
+
+	Copyright (C) 2001-2026 EQEmu Development Team
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+#include "common/eqemu_logsys.h"
+
+class PageAlignedAllocatorBase
+{
+protected:
+	void* allocateInternal(size_t amount, size_t alignment);
+	size_t getPageSize() const;
+};
+
+// Page-aligned allocator for std::vector
+template <typename T>
+class PageAlignedAllocator : public PageAlignedAllocatorBase
+{
+public:
+	using value_type = T;
+
+	PageAlignedAllocator() noexcept = default;
+
+	template <typename U>
+	PageAlignedAllocator(const PageAlignedAllocator<U>&) noexcept {}
+
+	T* allocate(std::size_t n)
+	{
+		size_t size = n * sizeof(T);
+
+		return static_cast<T*>(allocateInternal(size, getPageSize()));
+	}
+
+	void deallocate(T* p, std::size_t) noexcept
+	{
+		free(p);
+	}
+};
+
+template <typename T, typename U>
+bool operator==(const PageAlignedAllocator<T>&, const PageAlignedAllocator<U>&) noexcept {
+	return true;
+}
+
+template <typename T, typename U>
+bool operator!=(const PageAlignedAllocator<T>&, const PageAlignedAllocator<U>&) noexcept {
+	return false;
+}
+
+// Kernel Samepage Merging (KSM) functionality
+namespace KSM {
+
+void CheckPageAlignment(void* ptr);
+void* AllocatePageAligned(size_t size);
+void MarkMemoryForKSM(void* start, size_t size);
+void AlignHeapToPageBoundary();
+void* MarkHeapStart();
+size_t MeasureHeapUsage(void* start);
+
+} // namespace KSM