Inter-processor interrupt: Difference between revisions

Revision as of 20:54, 8 September 2024

Revision as of 07:07, 8 July 2025

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In [[computing]], an '''inter-processor interrupt''' ('''IPI'''), also known as a ''shoulder tap'', is a special type of [[interrupt]] by which one [[Processor (computing)|processor]] may interrupt another processor in a [[multiprocessor]] system if the interrupting processor requires action from the other processor. Actions that might be requested include:

* flushesFlushes of [[memory management unit]] caches, such as [[translation lookaside buffer]]s, on other processors when memory mappings are changed by one processor;

* stoppingStopping when the system is being shut down by one processor.

* Notify a processor that higher -priority work is available.

* Notify a processor of work that cannot be done on all processors due to, e.g.,

** asymmetric access to [[I/O channel]]s<ref>{{cite manual