NOHZ_FULL, isolated CPUs and reading CPU MSR
NOHZ_FULL, isolated CPUs and reading CPU MSR
Posted Jun 2, 2020 1:36 UTC (Tue) by nix (subscriber, #2304)In reply to: NOHZ_FULL, isolated CPUs and reading CPU MSR by zlynx
Parent article: Frequency-invariant utilization tracking for x86
Yeah: also enthusiast forums and enterprise kernels on stodgy old stability-first enterprise distros seem like things that won't be mixing very often. :)
(What they are presumably actually looking for here is CPU affinity with QEMU to try to keep a roughly 1:1 mapping between QEMU vCPU cores and real CPU cores. There were patches to do it inside QEMU but they never made it upstream and eventually bitrotted: it looks like libvirt does it from outside QEMU by brute force and cgroups.)