Hi Thomas, On Wed, 23 Oct 2019 at 16:29, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > On Wed, 23 Oct 2019, Wanpeng Li wrote: > > I didn't see your refactor to get_nohz_timer_target() which you > > mentioned in IRC after four months, I can observe cyclictest drop from > > 4~5us to 8us in kvm guest(we offload the lapic timer emulation to > > housekeeping cpu to avoid timer fire external interrupt on the pCPU > > which vCPU resident incur a vCPU vmexit) w/o this patch in the case of > > there is no busy housekeeping cpu. The score can be recovered after I > > give stress to create a busy housekeeping cpu. > > > > Could you consider applying this patch for temporary since I'm not > > sure when the refactor can be ready. > > Yeah. It's delayed (again).... Will pick that up. I didn't find WIP tag for this work after ~half year since v4 was posted https://lkml.org/lkml/2019/6/28/231 Could you apply this patch for temporary because the completion time of refactor is not deterministic. Wanpeng
