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https://wiki.osdev.org/Context_Switching
Hardware Context Switching. Some CPU's have a special mechanism to perform context switches in hardware. The following information gives details on 80x86 CPU's only. The hardware context switching mechanism (called Hardware Task Switching in the CPU manuals) can be used to change all of the CPU's state except for the FPU/MMX and SSE state.
https://en.wikipedia.org/wiki/Context_switch
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.
http://www.linfo.org/context_switch.html
Oct 25, 2004 · Intel 80386 and higher CPUs contain hardware support for context switches. However, most modern operating systems perform software context switching, which can be used on any CPU, rather than hardware context switching in an attempt to obtain improved performance. Software context switching was first implemented in Linux for Intel-compatible ...
https://pdfs.semanticscholar.org/d4b6/6147e050a2c1f1f335c925799708d752ce1d.pdf
time systems [1, 2]. Furthermore, in many embedded applications, context switching time is one of the most important factors that affect the quality of target applications [3, 4]. Unlike existing microprocessors, the ARM Cortex-M3 processor achieves a relatively short context switching time by performing a partial context switching in hardware [5].
http://cs.uns.edu.ar/~jechaiz/sosd/clases/extras/Context_switch_-_Wikipedia__the_free_encyclopedia.pdf
design of operating systems is to optimize the use of context switches. A context switch can mean a register context switch, a task context switch, a thread context switch, or a process context switch. ... like the Intel 80286 and higher CPUs, have hardware support for context switches, by making use of a special data segment designated the ...
https://www.osti.gov/doepatents/biblio/1187936
Abstract. A device for supporting hardware enabled performance counters with support for context switching include a plurality of performance counters operable to collect information associated with one or more computer system related activities, a first register operable to store a memory address, a second register operable to store a mode indication, and a state machine operable to read the ...
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.allinterview.com/showanswers/8208/what-is-context-switch.html
Context-switch time is overhead; the system does no useful work while switching The more complex the OS and the PCB -> longer the context switch Time dependent on hardware support Some hardware provides multiple sets of registers per CPU -> multiple contexts loaded at once
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.
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