Download Linux Process Manager: The Internals of Scheduling, by John O'Gorman PDF

By John O'Gorman

* an incredible source to appreciate the internals, line by way of line* appears to be like at structure established code for laptop model* Addresses technique construction, timers, software program and interrupts, signs, tracing strategies, and the digital 8086 mode

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Additional resources for Linux Process Manager: The Internals of Scheduling, Interrupts and Signals

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How does an operating system keep track of all of these? One possibility would be to use a fixed size table, an array of struct task_struct. A process would be inserted in this array at a position corresponding to its pid. This has the advantage that the information relating to a particular process can be found immediately by indexing into this array. The downside is that the task_struct itself is quite a large structure; a table of such structures would take up a very significant amount of memory, and there can be quite a lot of waste space if there are only a few processes running and space has been allocated for hundreds.

Shows the data structure used to save this extra state. Obviously, there is much overlap with the previous figure. After all, this is only an extension of that figure. 17, but note that they are now unsigned short. This makes sense, as they are only 16-bit registers. 298 the first two bytes of the last non-control instruction executed is stored in the last instruction opcode register and saved here. 17. 35 Volatile environment and input ^ output 303 this is the MXCSR register, which provides control and status bits for operations performed on the registers.

We have seen the links next_task and prev_task. 1), but, to avoid the overhead of searching such a sequential list, the structures are also kept on a hash table, which facilitates fast lookup. 1 Manipulating the linked list of task structures This section examines the sequential list. h. that manipulate the various links in a task_struct. One removes a structure, another inserts a structure, and a third follows the links from start to finish. The Linux Process Manager. , removes a descriptor p from the process structure, and from lists of siblings.

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