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Kernel: Remove the kmalloc_eternal heap :^)

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

View file

@ -30,7 +30,7 @@ UNMAP_AFTER_INIT void PCISerialDevice::detect()
// If this is the first port of the first pci serial device, store it as the debug PCI serial port (TODO: Make this configurable somehow?)
if (!is_available())
s_the = serial_device;
// NOTE: We intentionally leak the reference to serial_device here, as it is eternal
// NOTE: We intentionally leak the reference to serial_device here.
}
dmesgln("PCISerialDevice: Found {} @ {}", board_definition.name, device_identifier.address());