Re: [PATCH] KVM: do not shrink halt_poll_ns below grow_start

[Paolo Bonzini]

On 15/09/21 03:42, Sergey Senozhatsky wrote:
> On (21/09/02 12:11), Sergey Senozhatsky wrote:
> > grow_halt_poll_ns() ignores values between 0 and
> > halt_poll_ns_grow_start (10000 by default). However,
> > when we shrink halt_poll_ns we may fall way below
> > halt_poll_ns_grow_start and endup with halt_poll_ns
> > values that don't make a lot of sense: like 1 or 9,
> > or 19.
> >
> > VCPU1 trace (halt_poll_ns_shrink equals 2):
> >
> > VCPU1 grow 10000
> > VCPU1 shrink 5000
> > VCPU1 shrink 2500
> > VCPU1 shrink 1250
> > VCPU1 shrink 625
> > VCPU1 shrink 312
> > VCPU1 shrink 156
> > VCPU1 shrink 78
> > VCPU1 shrink 39
> > VCPU1 shrink 19
> > VCPU1 shrink 9
> > VCPU1 shrink 4
> >
> > Mirror what grow_halt_poll_ns() does and set halt_poll_ns
> > to 0 as soon as new shrink-ed halt_poll_ns value falls
> > below halt_poll_ns_grow_start.
>
> Gentle ping.
>
> 	-ss

Queued, thanks.

Paolo