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serenity/Kernel
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Andreas Kling 50677bf806 Kernel: Refactor scheduler to use dynamic thread priorities 
Threads now have numeric priorities with a base priority in the 1-99
range.

Whenever a runnable thread is *not* scheduled, its effective priority
is incremented by 1. This is tracked in Thread::m_extra_priority.
The effective priority of a thread is m_priority + m_extra_priority.

When a runnable thread *is* scheduled, its m_extra_priority is reset to
zero and the effective priority returns to base.

This means that lower-priority threads will always eventually get
scheduled to run, once its effective priority becomes high enough to
exceed the base priority of threads "above" it.

The previous values for ThreadPriority (Low, Normal and High) are now
replaced as follows:

    Low -> 10
    Normal -> 30
    High -> 50

In other words, it will take 20 ticks for a "Low" priority thread to
get to "Normal" effective priority, and another 20 to reach "High".

This is not perfect, and I've used some quite naive data structures,
but I think the mechanism will allow us to build various new and
interesting optimizations, and we can figure out better data structures
later on. :^)
2019-12-30 18:46:17 +01:00
..
Arch/i386 Kernel: Interpret "reserved bit violation" page faults correctly 2019-12-25 13:35:57 +01:00
Devices Kernel: Simplify force_pio logic in PATA driver (#923) 2019-12-26 22:57:58 +01:00
FileSystem Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
Heap Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
Net Kernel: Fix code locked behind NETWORK_TASK_DEBUG 2019-12-28 02:03:49 +01:00
TTY VirtualConsole: use memmove for an overlapping copy 2019-12-20 20:02:45 +01:00
VM Kernel: Add a mode flag to sys$purge and allow purging clean inodes 2019-12-29 13:16:53 +01:00
.bochsrc Meta: Make Serenity run on Bochs once again 2019-08-06 21:09:24 +02:00
.gitignore
Assertions.h
build-gpt-image-grub.sh Build: Fix more bugs in the POSIX sh-ification of scripts 2019-11-03 13:11:43 +01:00
build-image-grub.sh Build: Bump the default disk image size from 500MB to 600MB 2019-11-26 12:54:33 +01:00
build-image-qemu.sh Build: Allow building serenityOS ext2 root filesystem on macOS host 2019-12-27 02:19:55 +01:00
build-root-filesystem.sh MenuApplets: Add Clock applet, move code from WindowServer to the applet. 2019-12-27 22:47:31 +01:00
CMOS.cpp
CMOS.h
Console.cpp Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
Console.h Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
DoubleBuffer.cpp Revert "Kernel: Make DoubleBuffer use a KBuffer instead of kmalloc()ing" 2019-10-18 15:58:06 +02:00
DoubleBuffer.h Revert "Kernel: Make DoubleBuffer use a KBuffer instead of kmalloc()ing" 2019-10-18 15:58:06 +02:00
FB.h Kernel: Add framebuffer ioctls; wrap raw ioctls with a C API 2019-08-18 07:40:02 +02:00
grub.cfg Kernel: Embrace the SerenityOS name 2019-12-29 19:08:02 +01:00
grub_gpt.cfg Kernel: Embrace the SerenityOS name 2019-12-29 19:08:02 +01:00
init.cpp Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
IO.h
IRQHandler.cpp
IRQHandler.h
KBuffer.h Kernel: Make kernel memory regions be non-executable by default 2019-12-25 22:41:34 +01:00
KBufferBuilder.cpp Kernel: Make kernel memory regions be non-executable by default 2019-12-25 22:41:34 +01:00
KBufferBuilder.h AK: Rename <AK/AKString.h> to <AK/String.h> 2019-09-06 15:36:54 +02:00
KernelInfoPage.h Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 2019-12-15 21:29:26 +01:00
KeyCode.h
KParams.cpp AK: Make HashMap::get(Key) return an Optional<Value>. 2019-07-24 10:25:43 +02:00
KParams.h AK: Rename <AK/AKString.h> to <AK/String.h> 2019-09-06 15:36:54 +02:00
kprintf.cpp Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
KResult.h Kernel: Add move assign operator to KResultOr 2019-12-29 23:01:27 +01:00
kstdio.h Build: Get rid of the USERLAND define 2019-12-20 22:59:11 +01:00
KSyms.cpp Kernel: Add a size argument to validate_read_from_kernel 2019-12-24 01:28:38 +01:00
KSyms.h Kernel: Allow modules to link against anything in kernel.map :^) 2019-11-28 21:30:20 +01:00
linker.ld Revert "Kernel: Move Kernel mapping to 0xc0000000" 2019-11-23 17:27:09 +01:00
Lock.cpp Kernel: Use a dedicated thread state for wait-queued threads 2019-12-01 16:02:58 +01:00
Lock.h Kernel: Add Lock::is_locked() 2019-12-26 11:43:23 +01:00
makeall.sh Build: Fix shellcheck warnings in makeall.sh 2019-12-24 02:19:59 +01:00
Makefile Kernel: Add kernel-level timer queue (heavily based on @juliusf's work) 2019-12-27 02:15:45 +01:00
mkmap.sh Kernel: Allow modules to link against anything in kernel.map :^) 2019-11-28 21:30:20 +01:00
Module.h Kernel: Implement basic module unloading :^) 2019-11-28 21:07:22 +01:00
MousePacket.h
Multiboot.h
PCI.cpp Kernel: Hide PCI logs behind a debug flag like other logs 2019-08-14 06:28:53 +02:00
PCI.h Kernel: Add more PCI configuration reading functions 2019-08-14 06:28:53 +02:00
Process.cpp Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
Process.h Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
ProcessTracer.cpp
ProcessTracer.h Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
Profiling.cpp Kernel: Separate out the symbol offsets in profile output 2019-12-12 21:59:47 +01:00
Profiling.h Kernel: Separate out the symbol offsets in profile output 2019-12-12 21:59:47 +01:00
RTC.cpp Kernel: Fix BIOS date/time on hardware 2019-09-28 13:59:49 +02:00
RTC.h
run Kernel: Embrace the SerenityOS name 2019-12-29 19:08:02 +01:00
Scheduler.cpp Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
Scheduler.h Kernel: Get rid of "main thread" concept 2019-12-22 12:37:58 +01:00
SharedBuffer.cpp Kernel: Rename vmo => vmobject everywhere 2019-12-19 19:15:27 +01:00
SharedBuffer.h Kernel+LibC: Make all SharedBuffers purgeable (default: non-volatile) 2019-12-09 20:06:47 +01:00
StdLib.cpp Kernel+LibC: Build with basic -fstack-protector support 2019-12-20 21:03:32 +01:00
StdLib.h Kernel: Add strncmp() 2019-08-11 16:30:43 +02:00
sync.sh Build: Make sure PATH is passed properly (#765) 2019-11-12 10:26:50 +01:00
Syscall.cpp Kernel: Make separate kernel entry points for each PIC IRQ 2019-12-15 12:47:53 +01:00
Syscall.h Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
TestModule.cpp Kernel: Have modules export their name in a "module_name" string 2019-11-29 21:31:17 +01:00
Thread.cpp Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
Thread.h Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
TimerQueue.cpp Kernel: Add kernel-level timer queue (heavily based on @juliusf's work) 2019-12-27 02:15:45 +01:00
TimerQueue.h Kernel: Add kernel-level timer queue (heavily based on @juliusf's work) 2019-12-27 02:15:45 +01:00
UnixTypes.h Kernel: Add a mode flag to sys$purge and allow purging clean inodes 2019-12-29 13:16:53 +01:00
WaitQueue.cpp Kernel: Use IntrusiveList to make WaitQueue allocation-free :^) 2019-12-22 12:38:01 +01:00
WaitQueue.h Kernel: Use IntrusiveList to make WaitQueue allocation-free :^) 2019-12-22 12:38:01 +01:00