linux-kernel - Re: [PATCH v2] cpuidle-haltpoll: Enable kvm guest polling when dedicated physical CPUs are available

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Message-ID: <CANRm+Czb07GGy7pP2NRLhaXV4yy01ozdqH34CTSMCSJPR1ZfPw@mail.gmail.com>
Date:   Thu, 5 Sep 2019 08:15:44 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2] cpuidle-haltpoll: Enable kvm guest polling when
 dedicated physical CPUs are available

On Wed, 4 Sep 2019 at 17:48, Rafael J. Wysocki
<rafael.j.wysocki@...el.com> wrote:
>
> On 8/29/2019 10:49 AM, Wanpeng Li wrote:
> > From: Wanpeng Li <wanpengli@...cent.com>
> >
> > The downside of guest side polling is that polling is performed even
> > with other runnable tasks in the host. However, even if poll in kvm
> > can aware whether or not other runnable tasks in the same pCPU, it
> > can still incur extra overhead in over-subscribe scenario. Now we can
> > just enable guest polling when dedicated pCPUs are available.
> >
> > Acked-by: Paolo Bonzini <pbonzini@...hat.com>
> > Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Cc: Paolo Bonzini <pbonzini@...hat.com>
> > Cc: Radim Krčmář <rkrcmar@...hat.com>
> > Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
>
> As stated before, I'm going to queue up this change for 5.4, with the
> Paolo's ACK.
>
> BTW, in the future please CC power management changes to
> linux-pm@...r.kernel.org for easier handling.

Ok, thanks.

Wanpeng