Migration disable for the mainline
Migration disable for the mainline
[Kernel] Posted Nov 9, 2020 20:50 UTC (Mon) by corbet
The realtime developers have been working for many years to create a kernel where the highest-priority task is always able to run without delay. That has meant a long process of finding and fixing situations where high-priority tasks might be blocked from running; one of the persistent problems in this regard has been kernel code that disables preemption. One tool that the realtime developers have reached for is disabling migration (moving a process from one CPU to another) rather than preemption; this approach has not been entirely popular among scheduler developers, though. Even so, the solution would appear to be this migration-disable patch set from scheduler developer Peter Zijlstra.