Kernel data structures

While a data mapping comprises of a single contiguous VA with the same protection attributes, an image mapping Kernel data structures of mapping the various sections of the executable into multiple ranges with different protection attributes.

The KeyedWaitChain field is used to maintain the thread in the list of threads that are waiting on a particular keyed event.

This list is non-empty only for processes that are non-resident in memory. This additional level or indirection allows for section sizes of 4GB i. Device objects can be layered on Kernel data structures of other device objects forming a stack of devices.

We need a special pointer that refers to your linked list, without being a list node itself. The BlockSize field contains the size of the pool block including the header and any padding bytes.

If you pass the "last" element as head, this function can be used to implement a stack. The FsContext2 field points to a cache control block, a data structure that the FSD uses to store instance specific information about the file or stream. Transition substructure is used to store information about the page.

A singly linked lists: The DataSectionObject field points to the control area, a structure that serves as a link between the memory manager and the file system and is used to memory map data files.

A doubly linked lists: I am working on it. A single file can have 2 separate mappings one as executable file or another as a data file. This is one of the first 10 values in the enumerated type nt! The size of the structure allocate per thread is stored in Win32K. The field ProfileListHead contains list of profile objects that have been created for this process.

The first element is often represented by a special pointer, head, that enables easy access to the "start" of the list. This list is used by ExpUpdateTimerResolution to update the time resolution to the lowest requested value amongst all the processes. The number of entries in the PFN database is nt!

Data structures contain data and pointers; addresses of other data structures or the addresses of routines. The field JobLinks is the list of processes that are part of a job are queued together in a linked list with head of the list at EJOB.

ThreadListHead is the head of this list.

Data Structures in the Linux Kernel

This asynchronous model allows for maximum throughput and optimal resource utilization. The majority of the linked list routines accept one or two parameters: Device nodes have a parent child and sibling relationship.

The field ThreadListHead is the list of all threads in the process. The following two figures are singly and doubly circular linked lists, respectively: Because the list is circular and generally has no concept of first or last nodes, you can pass any element for head.Within the kernel data structures, this means that two entries in the file descriptor table reference the same file table entry.

As a result, a read and write to either of the file descriptor is the same, as in, they reference the same file. Most of the data structures mentioned in this article are allocated by the kernel from paged or non-paged pool, which is a part of the kernel virtual address space.

The following data structures are discussed in this document, click on any of them to directly go to the description.

Data Structures in the Linux Kernel

Usually you encounter this word when you read about kernel debugging, tracing, or kernel dumps. A kernel dump can copy out only the kernel structures, or the kernel structures as well as the process/user data. Most of the time you just need the kernel data structures. These symbol files contains hundreds of internal data structures from Windows kernel, many of them are not documented.

I used the WinDbg debugger to extract all kernel data structures, and then I created a complex script that converted these data structures into C/C++ format. Kernel Data Structures¶ Kernel gives you linked list and red black tree implementations.

You need not code your own linked list for your code. The linked list is extensively used by the kernel.

Red Black tree is used in the Completely Fair Schedular. Mostly these data structures exist in physical memory and are accessible only by the kernel and its subsystems.

Data structures contain data and pointers; addresses of other data structures or the addresses of routines. Taken all together, the data structures used.

Kernel data structures
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