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2c0df5e7e7
ladybird/Kernel
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Andreas Kling 2c0df5e7e7 Kernel: Share committed COW pages between whole VMObject lineage 
When cloning an AnonymousVMObject, committed COW pages are shared
between the parent and child object. Whicever object COW's first will
take the shared committed page, and if the other object ends up doing
a COW as well, it will notice that the page is no longer shared by
two objects and simple remap it as read/write.

When a child is COW'ed again, while still having shared committed
pages with its own parent, the grandchild object will now join in the
sharing pool with its parent and grandparent. This means that the first
2 of 3 objects that COW will draw from the shared committed pages, and
3rd will remap read/write.

Previously, we would "fork" the shared committed pages when cloning,
which could lead to a situation where the grandparent held on to 1 of
the 3 needed shared committed pages. If both the child and grandchild
COW'ed, they wouldn't have enough pages, and since the grandparent
maintained an extra +1 ref count on the page, it wasn't possible to
to remap read/write.
2021-07-30 13:17:55 +02:00
..
ACPI Kernel: Don't truncate physical address in ACPI table to 32 bits 2021-07-18 22:09:05 +02:00
API Kernel+LibSystem: Add a 4th syscall argument 2021-07-25 14:08:50 +02:00
Arch Kernel: Fix CPU initialization for SMP 2021-07-27 19:45:38 +02:00
Bus Kernel: Remove ContiguousVMObject, let AnonymousVMObject do the job 2021-07-25 18:44:47 +02:00
Devices Kernel: Fix integer overflow in KCOV_SETBUFSIZE ioctl 2021-07-26 23:52:15 +02:00
FileSystem Kernel/ProcFS: Add S_IFREG bit to regular files in /proc 2021-07-28 18:55:38 +02:00
Graphics Prekernel: Export some multiboot parameters in our own BootInfo struct 2021-07-27 13:15:16 +02:00
Heap Kernel+AK: Generate compile-time error for non-sized delete 2021-07-16 20:51:13 +02:00
Interrupts Kernel: Use IntrusiveList for keeping track of GenericInterruptHandlers 2021-07-21 20:21:29 +02:00
Modules Everything: Move to SPDX license identifiers in all files. 2021-04-22 11:22:27 +02:00
Net Kernel: Avoid file descriptor leak in Process::sys$socketpair on error 2021-07-28 19:07:00 +02:00
Prekernel Kernel: Support loading the kernel at almost arbitrary virtual addresses 2021-07-27 13:15:16 +02:00
Storage Kernel: Consolidate API for creating AnonymousVMObject with given pages 2021-07-22 09:17:02 +02:00
Syscalls Kernel: Fail madvise() volatile change with EINVAL for non-purgeable mem 2021-07-28 20:42:49 +02:00
Tasks Kernel: Make VirtualFileSystem::sync() static 2021-07-11 00:26:17 +02:00
Time Everywhere: Make tracking cpu usage independent from system ticks 2021-07-18 22:08:26 +02:00
TTY Kernel: Modify the IOCTL API to return KResult 2021-07-27 01:23:37 +04:30
VirtIO Kernel: Fix inverted check in VirtIOConsolePort 2021-07-14 12:33:07 +02:00
VM Kernel: Share committed COW pages between whole VMObject lineage 2021-07-30 13:17:55 +02:00
AddressSanitizer.cpp Everywhere: Use bgianf@serenityos.org for my copyright attribution 2021-04-22 21:15:54 +02:00
AddressSanitizer.h Everywhere: Use bgianf@serenityos.org for my copyright attribution 2021-04-22 21:15:54 +02:00
Assertions.h Kernel: Add [[unlikely]] attribute to VERIFY 2021-06-29 22:57:52 +04:30
AtomicEdgeAction.h Kernel: Add AtomicEdgeAction class 2021-07-07 21:57:01 +02:00
BootInfo.h Kernel: Support loading the kernel at almost arbitrary virtual addresses 2021-07-27 13:15:16 +02:00
CMakeLists.txt Kernel: Use our toolchain's c++filt tool for the kernel map 2021-07-29 10:38:31 +02:00
CMOS.cpp Everything: Move to SPDX license identifiers in all files. 2021-04-22 11:22:27 +02:00
CMOS.h Everything: Move to SPDX license identifiers in all files. 2021-04-22 11:22:27 +02:00
CommandLine.cpp Kernel: Un-unmap-after-init CommandLine::boot_mode() 2021-07-26 11:33:14 +02:00
CommandLine.h Kernel/CommandLine: Add option to disable physical networking hardware 2021-06-09 22:44:09 +04:30
ConsoleDevice.cpp Kernel: Move special sections into Sections.h 2021-06-24 00:38:23 +02:00
ConsoleDevice.h Kernel: Make various T::class_name() and similar return StringView 2021-07-11 01:46:59 +02:00
CoreDump.cpp Kernel: Rename VFS => VirtualFileSystem 2021-07-11 00:25:24 +02:00
CoreDump.h Kernel: Use Forward.h headers more 2021-07-11 14:14:51 +02:00
Debug.h.in USB: Further Implement USB Structures 2021-06-12 18:17:25 +04:30
DoubleBuffer.cpp Kernel: Rename Locker => MutexLocker 2021-07-18 01:53:04 +02:00
DoubleBuffer.h Kernel: Rename Lock to Mutex 2021-07-17 21:10:32 +02:00
embedmap.sh Kernel: Make new kernel build process work on macOS 2021-07-15 11:04:30 +02:00
Forward.h Kernel: Introduce ProcessorSpecific<T> for per-CPU data structures 2021-07-27 14:32:30 +02:00
FutexQueue.cpp Kernel: Fix futex race that could lead to thread waiting forever 2021-07-07 10:05:55 +02:00
FutexQueue.h Kernel: Fix futex race that could lead to thread waiting forever 2021-07-07 10:05:55 +02:00
GlobalProcessExposed.cpp Kernel/ProcFS: Make various things superuser-only once again 2021-07-28 18:59:53 +02:00
init.cpp Kernel: Mark the stack check guard as READONLY_AFTER_INIT 2021-07-27 14:50:10 +02:00
IO.h Kernel: Specify I/O size for BMIDEChannel 2021-06-28 15:55:00 +02:00
KBuffer.h Kernel: Fix always-true comparison warnings 2021-07-03 01:56:31 +04:30
KBufferBuilder.cpp Kernel: Remove KBufferBuilder's can_expand restriction 2021-07-20 18:05:05 +02:00
KBufferBuilder.h Kernel: Remove KBufferBuilder's can_expand restriction 2021-07-20 18:05:05 +02:00
KLexicalPath.cpp Kernel: Make KLexicalPath::basename() more compliant 2021-07-11 14:10:58 +02:00
KLexicalPath.h Kernel: Add KLexicalPath::try_join and use it 2021-07-07 15:32:17 +02:00
kprintf.cpp Kernel: Add dbgputch() to kstdio.h 2021-06-24 10:29:09 +02:00
KResult.h AK+Kernel: Fix perfect forwarding constructors shadowing others 2021-07-08 10:11:00 +02:00
kstdio.h Kernel: Add dbgputch() to kstdio.h 2021-06-24 10:29:09 +02:00
KString.cpp Kernel: Allow passing null pointer to delete 2021-07-14 13:12:25 +02:00
KString.h Kernel: Add formatter function for OwnPtr<KString> 2021-07-07 15:32:17 +02:00
KSyms.cpp Kernel: Print relative symbol addresses in dump_backtrace_impl 2021-07-28 23:43:58 +02:00
KSyms.h Everything: Move to SPDX license identifiers in all files. 2021-04-22 11:22:27 +02:00
linker.ld Kernel: Support loading the kernel at almost arbitrary virtual addresses 2021-07-27 13:15:16 +02:00
LockMode.h Kernel: Allow Lock to block from BlockCondition 2021-07-12 11:27:18 +02:00
MiniStdLib.cpp Kernel: Introduce basic pre-kernel environment 2021-07-18 17:31:13 +02:00
mkmap.sh Kernel: Use our toolchain's c++filt tool for the kernel map 2021-07-29 10:38:31 +02:00
Module.h Everything: Move to SPDX license identifiers in all files. 2021-04-22 11:22:27 +02:00
Multiboot.h Prekernel: Export some multiboot parameters in our own BootInfo struct 2021-07-27 13:15:16 +02:00
Mutex.cpp Kernel: Rename Lock to Mutex 2021-07-17 21:10:32 +02:00
Mutex.h Kernel: Allow MutexLocker to be conditionally initialized 2021-07-20 03:21:14 +02:00
Panic.cpp Kernel: Shutdown on panic in self-test mode 2021-07-27 01:25:04 +04:30
Panic.h Kernel/Graphics + SystemServer: Support text mode properly 2021-05-16 19:58:33 +02:00
PerformanceEventBuffer.cpp Kernel: Rename PerformanceEvent methods to be more ARCH independent 2021-07-19 08:46:55 +02:00
PerformanceEventBuffer.h Kernel: Rename PerformanceEvent methods to be more ARCH independent 2021-07-19 08:46:55 +02:00
PerformanceManager.h Kernel: Rename PerformanceEvent methods to be more ARCH independent 2021-07-19 08:46:55 +02:00
PhysicalAddress.h Kernel: Move PhysicalPage classes out of the heap into an array 2021-07-08 11:43:34 +02:00
Process.cpp Kernel: Track allocated FileDescriptionAndFlag elements in each Process 2021-07-28 19:07:00 +02:00
Process.h Kernel: Track allocated FileDescriptionAndFlag elements in each Process 2021-07-28 19:07:00 +02:00
ProcessExposed.cpp Kernel: Simplify ProcFS generated buffer caching 2021-07-20 18:05:05 +02:00
ProcessExposed.h Kernel/ProcFS: Make various things superuser-only once again 2021-07-28 18:59:53 +02:00
ProcessGroup.cpp Kernel: Standardize the header include style to 'include <Kernel/...>' 2021-07-11 21:37:38 +02:00
ProcessGroup.h Kernel: Rename Lock to Mutex 2021-07-17 21:10:32 +02:00
ProcessSpecificExposed.cpp Kernel: Make purgeable memory a VMObject level concept (again) 2021-07-25 17:28:05 +02:00
Random.cpp Kernel: Rename Locker => MutexLocker 2021-07-18 01:53:04 +02:00
Random.h Kernel: Rename Lock to Mutex 2021-07-17 21:10:32 +02:00
RTC.cpp Everything: Move to SPDX license identifiers in all files. 2021-04-22 11:22:27 +02:00
RTC.h Everything: Move to SPDX license identifiers in all files. 2021-04-22 11:22:27 +02:00
SanCov.cpp Kernel: Add option to build with coverage instrumentation and KCOV 2021-07-26 17:40:28 +02:00
Scheduler.cpp Kernel: Introduce ProcessorSpecific<T> for per-CPU data structures 2021-07-27 14:32:30 +02:00
Scheduler.h Kernel: Remove unused Scheduler::yield_from_critical() 2021-07-26 00:39:10 +02:00
Sections.h Kernel: Support loading the kernel at almost arbitrary virtual addresses 2021-07-27 13:15:16 +02:00
SpinLock.h Kernel: Pull apart CPU.h 2021-06-24 00:38:23 +02:00
StdLib.cpp Kernel: Introduce basic pre-kernel environment 2021-07-18 17:31:13 +02:00
StdLib.h Everywhere: Fix incorrect usages of AK::Checked 2021-07-04 20:08:28 +01:00
Syscall.cpp Kernel+LibSystem: Add a 4th syscall argument 2021-07-25 14:08:50 +02:00
Thread.cpp Kernel: Add option to build with coverage instrumentation and KCOV 2021-07-26 17:40:28 +02:00
Thread.h Kernel: Push ARCH specific ifdef's down into RegisterState functions 2021-07-19 08:46:55 +02:00
ThreadBlockers.cpp Kernel: Fix bogus check in Thread::WaitBlockCondition::finalize() 2021-07-16 15:18:47 +02:00
ThreadTracer.cpp Kernel: Remove unused header includes in root kernel tree 2021-07-11 21:37:38 +02:00
ThreadTracer.h Everywhere: Use nothrow new with adopt_{ref,own}_if_nonnull 2021-06-24 17:35:49 +04:30
TimerQueue.cpp Kernel: Fix deadlock cancelling timer 2021-07-12 11:27:18 +02:00
TimerQueue.h Kernel: Fix deadlock cancelling timer 2021-07-12 11:27:18 +02:00
UBSanitizer.cpp Kernel: Pull apart CPU.h 2021-06-24 00:38:23 +02:00
UnixTypes.h Kernel+LibC: Add linger to sys/sockets.h 2021-07-29 19:35:03 +01:00
UnveilNode.h Kernel: Allow unveiling subfolders regardless of parent's permissions 2021-06-08 12:15:04 +02:00
UserOrKernelBuffer.cpp Kernel: Add an API for turning a UserOrKernelBuffer into a KString 2021-07-17 22:07:49 +02:00
UserOrKernelBuffer.h Kernel: Add an API for turning a UserOrKernelBuffer into a KString 2021-07-17 22:07:49 +02:00
VirtualAddress.h Kernel: Make VirtualAddress::page_base() work with 64-bit addresses 2021-07-18 17:31:13 +02:00
WaitQueue.cpp Everywhere: Use "the SerenityOS developers." in copyright headers 2021-04-29 00:59:26 +02:00
WaitQueue.h Everywhere: Use "the SerenityOS developers." in copyright headers 2021-04-29 00:59:26 +02:00
WorkQueue.cpp Kernel: Move special sections into Sections.h 2021-06-24 00:38:23 +02:00
WorkQueue.h Kernel: Use plain Function objects for the WorkQueue 2021-05-19 21:36:57 +02:00