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Kernel: Remove the kmalloc_eternal heap :^)

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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().
This commit is contained in:
Andreas Kling 2021-12-28 19:12:22 +01:00
parent a1be135891
commit ac7ce12123
46 changed files with 5 additions and 82 deletions
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1
Kernel/Memory/MemoryManager.h
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@ -137,7 +137,6 @@ private:
};
class MemoryManager {
AK_MAKE_ETERNAL
friend class PageDirectory;
friend class AnonymousVMObject;
friend class Region;

1
Kernel/Memory/PhysicalRegion.h
View file

@ -13,7 +13,6 @@
namespace Kernel::Memory {
class PhysicalRegion {
AK_MAKE_ETERNAL;
AK_MAKE_NONCOPYABLE(PhysicalRegion);
AK_MAKE_NONMOVABLE(PhysicalRegion);

1
Kernel/Memory/PhysicalZone.h
View file

@ -17,7 +17,6 @@ namespace Kernel::Memory {
// The allocator uses a buddy block scheme internally.
class PhysicalZone {
AK_MAKE_ETERNAL;
AK_MAKE_NONCOPYABLE(PhysicalZone);
AK_MAKE_NONMOVABLE(PhysicalZone);