mirror of
https://github.com/RGBCube/serenity
synced 2025-10-30 23:52:43 +00:00
ac7ce12123
This was a premature optimization from the early days of SerenityOS. The eternal heap was a simple bump pointer allocator over a static byte array. My original idea was to avoid heap fragmentation and improve data locality, but both ideas were rooted in cargo culting, not data. We would reserve 4 MiB at boot and only ended up using ~256 KiB, wasting the rest. This patch replaces all kmalloc_eternal() usage by regular kmalloc().
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/OwnPtr.h>
|
|
#include <Kernel/Memory/PhysicalPage.h>
|
|
#include <Kernel/Memory/PhysicalZone.h>
|
|
|
|
namespace Kernel::Memory {
|
|
|
|
class PhysicalRegion {
|
|
AK_MAKE_NONCOPYABLE(PhysicalRegion);
|
|
AK_MAKE_NONMOVABLE(PhysicalRegion);
|
|
|
|
public:
|
|
static OwnPtr<PhysicalRegion> try_create(PhysicalAddress lower, PhysicalAddress upper)
|
|
{
|
|
return adopt_own_if_nonnull(new PhysicalRegion { lower, upper });
|
|
}
|
|
|
|
~PhysicalRegion();
|
|
|
|
void initialize_zones();
|
|
|
|
PhysicalAddress lower() const { return m_lower; }
|
|
PhysicalAddress upper() const { return m_upper; }
|
|
unsigned size() const { return m_pages; }
|
|
bool contains(PhysicalAddress paddr) const { return paddr >= m_lower && paddr < m_upper; }
|
|
|
|
OwnPtr<PhysicalRegion> try_take_pages_from_beginning(unsigned);
|
|
|
|
RefPtr<PhysicalPage> take_free_page();
|
|
NonnullRefPtrVector<PhysicalPage> take_contiguous_free_pages(size_t count);
|
|
void return_page(PhysicalAddress);
|
|
|
|
private:
|
|
PhysicalRegion(PhysicalAddress lower, PhysicalAddress upper);
|
|
|
|
static constexpr size_t large_zone_size = 16 * MiB;
|
|
static constexpr size_t small_zone_size = 1 * MiB;
|
|
|
|
NonnullOwnPtrVector<PhysicalZone> m_zones;
|
|
|
|
size_t m_large_zones { 0 };
|
|
|
|
PhysicalZone::List m_usable_zones;
|
|
PhysicalZone::List m_full_zones;
|
|
|
|
PhysicalAddress m_lower;
|
|
PhysicalAddress m_upper;
|
|
unsigned m_pages { 0 };
|
|
};
|
|
|
|
}
|