Re: [PATCH RFC 1/2] kvm vcpu: Note down pause loop exit

[Raghavendra K T]

On 07/12/2012 04:28 PM, Nikunj A Dadhania wrote:
> On Wed, 11 Jul 2012 16:22:29 +0530, Raghavendra K T<raghavendra.kt@xxxxxxxxxxxxxxxxxx>  wrote:
> > On 07/11/2012 02:23 PM, Avi Kivity wrote:
> > > This adds some tiny overhead to vcpu entry.  You could remove it by
> > > using the vcpu->requests mechanism to clear the flag, since
> > > vcpu->requests is already checked on every entry.
> >
> > So IIUC,  let's have request bit for indicating PLE,
> >
> > pause_interception() /handle_pause()
> > {
> >    make_request(PLE_REQUEST)
> >    vcpu_on_spin()
> >
> > }
> >
> > check_eligibility()
> >    {
> >    !test_request(PLE_REQUEST) || ( test_request(PLE_REQUEST)&&
> > dy_eligible())
> > .
> > .
> > }
> >
> > vcpu_run()
> > {
> >
> > check_request(PLE_REQUEST)
> I know check_request will clear PLE_REQUEST, but you just need a
> clear_request here, right?

Yes. tried to use check_request for clearing. But I ended up in
different implementation. (latest thread)


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