From: Wanpeng Li <kernellwp@gmail.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>, kvm <kvm@vger.kernel.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Marcelo Tosatti" <mtosatti@redhat.com>,
"Linux PM" <linux-pm@vger.kernel.org>
Subject: Re: [PATCH v2] cpuidle-haltpoll: Enable kvm guest polling when dedicated physical CPUs are available
Date: Thu, 5 Sep 2019 08:15:44 +0800 [thread overview]
Message-ID: <CANRm+Czb07GGy7pP2NRLhaXV4yy01ozdqH34CTSMCSJPR1ZfPw@mail.gmail.com> (raw)
In-Reply-To: <a70aeec2-1572-ea09-a0c5-299cd70ddc8a@intel.com>
On Wed, 4 Sep 2019 at 17:48, Rafael J. Wysocki
<rafael.j.wysocki@intel.com> wrote:
>
> On 8/29/2019 10:49 AM, Wanpeng Li wrote:
> > From: Wanpeng Li <wanpengli@tencent.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@redhat.com>
> > Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > Cc: Paolo Bonzini <pbonzini@redhat.com>
> > Cc: Radim Krčmář <rkrcmar@redhat.com>
> > Signed-off-by: Wanpeng Li <wanpengli@tencent.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@vger.kernel.org for easier handling.
Ok, thanks.
Wanpeng
next prev parent reply other threads:[~2019-09-05 0:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-29 8:49 [PATCH v2] cpuidle-haltpoll: Enable kvm guest polling when dedicated physical CPUs are available Wanpeng Li
2019-09-04 9:48 ` Rafael J. Wysocki
2019-09-05 0:15 ` Wanpeng Li [this message]
2019-09-10 17:15 ` Paolo Bonzini
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