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5f51d85184
ladybird/Kernel
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Tom 5f51d85184 Kernel: Improve time keeping and dramatically reduce interrupt load 
This implements a number of changes related to time:
* If a HPET is present, it is now used only as a system timer, unless
  the Local APIC timer is used (in which case the HPET timer will not
  trigger any interrupts at all).
* If a HPET is present, the current time can now be as accurate as the
  chip can be, independently from the system timer. We now query the
  HPET main counter for the current time in CPU #0's system timer
  interrupt, and use that as a base line. If a high precision time is
  queried, that base line is used in combination with quering the HPET
  timer directly, which should give a much more accurate time stamp at
  the expense of more overhead. For faster time stamps, the more coarse
  value based on the last interrupt will be returned. This also means
  that any missed interrupts should not cause the time to drift.
* The default system interrupt rate is reduced to about 250 per second.
* Fix calculation of Thread CPU usage by using the amount of ticks they
  used rather than the number of times a context switch happened.
* Implement CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE and use it
  for most cases where precise timestamps are not needed.
2020-12-21 18:26:12 +01:00
..
ACPI Kernel: Workaround QEMU bug and initialize i8042 controller 2020-12-18 10:02:14 +01:00
API Kernel: Move InodeWatcher::Event into Kernel/API/InodeWatcherEvent 2020-12-14 23:05:53 +01:00
Arch Kernel: Allow to install a real IRQ handler on a spurious one 2020-12-21 00:19:21 +01:00
Devices Kernel: Introduce the new Storage subsystem 2020-12-21 00:19:21 +01:00
FileSystem Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
Heap Kernel: Defer kmalloc heap contraction 2020-11-04 21:21:37 +01:00
Interrupts Kernel: Allow to install a real IRQ handler on a spurious one 2020-12-21 00:19:21 +01:00
Modules Kernel: Module symbol declarations for type-checking 2020-08-12 20:40:59 +02:00
Net Everywhere: Switch from (void) to [[maybe_unused]] (#4473) 2020-12-21 00:09:48 +01:00
PCI Kernel: Add various methods to handle interrupts in the PCI subsystem 2020-12-21 00:19:21 +01:00
Storage Kernel: Introduce the StorageManagement class 2020-12-21 00:19:21 +01:00
Syscalls Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
Tasks Kernel: Fix some issues related to fixes and block conditions 2020-12-12 21:28:12 +01:00
Time Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
TTY Everywhere: Switch from (void) to [[maybe_unused]] (#4473) 2020-12-21 00:09:48 +01:00
VM Kernel: Don't skip if found free page to allocate from a super region 2020-12-21 00:15:58 +01:00
.gitignore Meta: Removed all gitignore in the source tree only keeping the root one 2019-06-30 10:41:26 +02:00
Assertions.h Everywhere: Switch from (void) to [[maybe_unused]] (#4473) 2020-12-21 00:09:48 +01:00
CMakeLists.txt Kernel: Introduce the StorageManagement class 2020-12-21 00:19:21 +01:00
CMOS.cpp Kernel: Absorb LibBareMetal back into the kernel 2020-05-16 12:00:04 +02:00
CMOS.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
CommandLine.cpp Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
CommandLine.h Kernel: Copy command line to a safe place 2020-08-25 09:48:48 +02:00
Console.cpp Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
Console.h Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
CoreDump.cpp Everywhere: Switch from (void) to [[maybe_unused]] (#4473) 2020-12-21 00:09:48 +01:00
CoreDump.h Kernel: Make CoreDump::m_num_program_headers const 2020-12-15 11:24:46 +01:00
DoubleBuffer.cpp Kernel: Move block condition evaluation out of the Scheduler 2020-11-30 13:17:02 +01:00
DoubleBuffer.h Kernel: Move block condition evaluation out of the Scheduler 2020-11-30 13:17:02 +01:00
Forward.h Kernel: Generate a coredump file when a process crashes 2020-12-14 23:05:53 +01:00
init.cpp Kernel: Introduce the StorageManagement class 2020-12-21 00:19:21 +01:00
IO.h Kernel: Absorb LibBareMetal back into the kernel 2020-05-16 12:00:04 +02:00
KBuffer.h Kernel: Add KBuffer::try_create_with_bytes() 2020-12-18 19:22:26 +01:00
KBufferBuilder.cpp Kernel: Move KBufferBuilder to the fallible KBuffer API 2020-12-18 19:22:26 +01:00
KBufferBuilder.h Kernel: Move KBufferBuilder to the fallible KBuffer API 2020-12-18 19:22:26 +01:00
kprintf.cpp Kernel: Stop supporting sprintf 2020-08-22 20:55:10 +02:00
KResult.h Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
kstdio.h Kernel: Stop supporting sprintf 2020-08-22 20:55:10 +02:00
KSyms.cpp Kernel: Move KBufferBuilder to the fallible KBuffer API 2020-12-18 19:22:26 +01:00
KSyms.h Kernel: Update cryptically-named functions related to symbolication 2020-04-08 17:19:46 +02:00
linker.ld Kernel: Invoke heap constructors separately early on 2020-08-10 20:05:18 +02:00
Lock.cpp Kernel: Fix Lock race causing infinite spinning between two threads 2020-12-16 23:38:17 +01:00
Lock.h Kernel: Fix Lock race causing infinite spinning between two threads 2020-12-16 23:38:17 +01:00
LockMode.h Kernel: Fix Lock race causing infinite spinning between two threads 2020-12-16 23:38:17 +01:00
mkmap.sh Build: Switch to CMake :^) 2020-05-14 20:15:18 +02:00
Module.h Kernel: Move all code into the Kernel namespace 2020-02-16 01:27:42 +01:00
Multiboot.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
PerformanceEventBuffer.cpp Kernel: Use fallible KBuffer API in PerformanceEventBuffer 2020-12-19 10:23:12 +01:00
PerformanceEventBuffer.h Kernel: Use fallible KBuffer API in PerformanceEventBuffer 2020-12-19 10:23:12 +01:00
PhysicalAddress.h Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
Process.cpp Everywhere: Switch from (void) to [[maybe_unused]] (#4473) 2020-12-21 00:09:48 +01:00
Process.h Kernel: Move KBufferBuilder to the fallible KBuffer API 2020-12-18 19:22:26 +01:00
ProcessGroup.cpp Kernel: Move block condition evaluation out of the Scheduler 2020-11-30 13:17:02 +01:00
ProcessGroup.h Kernel: Move block condition evaluation out of the Scheduler 2020-11-30 13:17:02 +01:00
Profiling.cpp AK: Rename KB, MB, GB to KiB, MiB, GiB 2020-08-16 16:33:28 +02:00
Profiling.h Kernel: More PID/TID typing 2020-08-10 11:51:45 +02:00
Ptrace.cpp Kernel: Change wait blocking to Process-only blocking 2020-12-12 21:28:12 +01:00
Ptrace.h Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
Random.cpp Kernel: Fix some issues related to fixes and block conditions 2020-12-12 21:28:12 +01:00
Random.h LibCrypto: Require intent parameter in CTR constructor 2020-11-29 20:22:56 +01:00
RTC.cpp Kernel: Minor tweak to now() computation 2020-08-26 08:52:07 +02:00
RTC.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
Scheduler.cpp Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
Scheduler.h Kernel: Fix some issues related to fixes and block conditions 2020-12-12 21:28:12 +01:00
SharedBuffer.cpp Kernel: Fix SharedBuffer reference counting on fork 2020-11-24 21:26:39 +01:00
SharedBuffer.h Kernel: Fix SharedBuffer reference counting on fork 2020-11-24 21:26:39 +01:00
SpinLock.h Kernel: Minor SpinLock improvements 2020-11-11 12:27:25 +01:00
StdLib.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
StdLib.h Kernel: Add checks for is_trivially_copyable to copy_to/from_user 2020-10-02 15:38:07 +02:00
Syscall.cpp Kernel: Change wait blocking to Process-only blocking 2020-12-12 21:28:12 +01:00
Thread.cpp Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
Thread.h Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
ThreadBlockers.cpp Kernel: Change wait blocking to Process-only blocking 2020-12-12 21:28:12 +01:00
ThreadTracer.cpp Kernel: PID/TID typing 2020-08-10 11:51:45 +02:00
ThreadTracer.h Kernel: PID/TID typing 2020-08-10 11:51:45 +02:00
TimerQueue.cpp Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
TimerQueue.h Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
UnixTypes.h Kernel: Improve time keeping and dramatically reduce interrupt load 2020-12-21 18:26:12 +01:00
UserOrKernelBuffer.cpp AK: Add StringBuilder::appendff using the new format. 2020-09-22 15:06:40 +02:00
UserOrKernelBuffer.h FileSystem: Use OutputMemoryStream instead of BufferStream. 2020-09-15 20:36:45 +02:00
VirtualAddress.h Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
WaitQueue.cpp Kernel: Fix Lock race causing infinite spinning between two threads 2020-12-16 23:38:17 +01:00
WaitQueue.h Kernel: Fix Lock race causing infinite spinning between two threads 2020-12-16 23:38:17 +01:00