On 2/12/19 6:57 PM, Subhra Mazumdar wrote: > Hi Tim, > > On 10/12/18 11:01 AM, Tim Chen wrote: >> On 10/10/2018 05:09 PM, Subhra Mazumdar wrote: >>> Hi, >>> >>> I was following the Coscheduling patch discussion on lkml and Peter >>> mentioned he had a patch series. I found the following on github. >>> >>> https://github.com/pdxChen/gang/commits/sched_1.23-loadbal >>> >>> I would like to test this with KVMs. Are the commits from 38d5acb to >>> f019876 sufficient? Also is there any documentaion on how to use it (any >>> knobs I need to turn on for gang scheduling to happen?) or is it enabled by >>> default for KVMs? >>> >>> Thanks, >>> Subhra >>> >> I would suggest you try >> https://github.com/pdxChen/gang/tree/sched_1.23-base >> without the load balancing part of gang scheduling. >> It is enabled by default for KVMs. > I applied the following 3 patches on 4.19 and tried to install a KVM (with > virt-install). But the kernel hangs with following error: > > kernel:watchdog: BUG: soft lockup - CPU#21 stuck for 23s! [kworker/21:1:573] > > kvm,sched: Track VCPU threads > x86/kvm,sched: Add fast path for reschedule interrupt > sched: Optimize scheduler_ipi() > > The track VCPU patch seems to be the culprit. > > Thanks, > Subhra
Thanks for giving it a try. Peter is working on a new version. So I'll not try to debug this patchset for now. Tim
