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https://en.wikipedia.org/wiki/Context_switch
Hardware vs. software. Context switching can be performed primarily by software or hardware. Some processors, like the Intel 80386 and its successors, have hardware support for context switches, by making use of a special data segment designated the task state segment or TSS.
https://wiki.osdev.org/Context_Switching
Because a context switch can involve changing a large amount data it can be the one most costly operation in an operating system. There are many ways of performing a context switch. The x86 CPU provides a way of doing it completely in hardware, but for performance and portability reasons most modern OS's do context switches in software.
https://stackoverflow.com/questions/7439608/steps-in-context-switching
A typical process context switch happens like this: Process context switches are initiated by a thread-context switch, so all of the above, 1-9, is going to need to happen. At step 5 above, the scheduler decides to run a thread belonging to a different process from the one that owned the previously-running thread.
http://www.linfo.org/context_switch.html
Oct 25, 2004 · A context switch can also occur as a result of a hardware interrupt, which is a signal from a hardware device (such as a keyboard, mouse, modem or system clock) to the kernel that an event (e.g., a key press, mouse movement or …
https://www.quora.com/How-does-context-switch-time-depend-on-hardware-architecture
Feb 10, 2016 · Ultimately this depends on the underlying characteristics of the architecture. For modern operating systems, a big chunk of the price/cost of context switching revolves around memory management. Before a process can be scheduled to run, its memory...
https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-10-slot-switch/White_Paper_Tech_Overview_Virtual_Device_Contexts.html
Jan 08, 2014 · The Cisco ® Nexus 7000 Series Switches introduce support for the Cisco NX-OS Software platform, a new class of operating system designed for data centers. Based on the Cisco MDS 9000 SAN-OS platform, Cisco NX-OS introduces support for virtual device contexts (VDCs), which allows the switches to be virtualized at the device level.
https://communities.vmware.com/thread/176766
Nov 03, 2008 · Thanks once again for your detailed answers. I believe one final. question that I have is, assuming no hardware virtualization support, will a context switch result in a trap to the VMM, or more explicitly, will the VMM get a trap when a process is descheduled on a guest OS AND more importantly when a new process is being scheduled to run on the processor next.
https://www.allinterview.com/showanswers/8208/what-is-context-switch.html
A context switch is the computing process of saving and restoring the state (context) of a CPU such that multiple processes can share a single CPU resource. The context switch is an essential feature of a multitasking operating system. Context switches are usually time consuming and much of the design of operating systems is to minimize the time of
https://quizlet.com/55678312/os-test-2-chap-3-flash-cards/
Hardware support. The more complex the operating system, the ____ the amount of work that must be done during a context switch. Greater. Process identifier. An integer number that provides a unique value for each process in the system. Can be used as an index to access various attributes of a process within the kernel.
https://www.usenix.org/events/expcs07/papers/4-tsafrir.pdf
The Context-Switch Overhead Inflicted by Hardware Interrupts (and the Enigma of Do-Nothing Loops) Dan Tsafrir IBM T.J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598 ABSTRACT The overhead of a context switch is typically associated with multitasking, where several applications share a processor.
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