On Fri, 3 Feb 2023, Marcelo Tosatti wrote: > > Isnt there some lock/serializtion to stall the kernel until you are done? > > Not that i know of. Anyway, an additional datapoint is: > > "Software defined PLC" > (https://www.redhat.com/en/blog/software-defined-programmable-logic-controller-introduction), > applications > can perform system calls in their time sensitive loop. > > One example of an opensource software is OpenPLC. > > One would like to avoid interruptions for those cases as well. Well allowing sytem calls during "time sensitiveness" implies it is not that sensitive to vmstat updates which have a smaller impact than system calls. Unless we are talking about virtual system calls like gettimeofday or clock_gettime. These do not enter the kernel if configured correctly.
