From: Sean Christopherson <seanjc@google.com>
To: Kenta Ishiguro <kentaishiguro@sslab.ics.keio.ac.jp>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
David Hildenbrand <david@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
pl@sslab.ics.keio.ac.jp, kono@sslab.ics.keio.ac.jp
Subject: Re: [RFC PATCH 0/2] Mitigating Excessive Pause-Loop Exiting in VM-Agnostic KVM
Date: Wed, 21 Apr 2021 16:19:36 +0000 [thread overview]
Message-ID: <YIBQmMih1sNb5/rg@google.com> (raw)
In-Reply-To: <20210421150831.60133-1-kentaishiguro@sslab.ics.keio.ac.jp>
On Thu, Apr 22, 2021, Kenta Ishiguro wrote:
> To solve problems (2) and (3), patch 2 monitors IPI communication between
> vCPUs and leverages the relationship between vCPUs to select boost
> candidates. The "[PATCH] KVM: Boost vCPU candidiate in user mode which is
> delivering interrupt" patch
> (https://lore.kernel.org/kvm/CANRm+Cy-78UnrkX8nh5WdHut2WW5NU=UL84FRJnUNjsAPK+Uww@mail.gmail.com/T/)
> seems to be effective for (2) while it only uses the IPI receiver
> information.
On the IPI side of thing, I like the idea of explicitly tracking the IPIs,
especially if we can simplify the implementation, e.g. by losing the receiver
info and making ipi_received a bool. Maybe temporarily table Wanpeng's patch
while this approach is analyzed?
next prev parent reply other threads:[~2021-04-21 16:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-21 15:08 [RFC PATCH 0/2] Mitigating Excessive Pause-Loop Exiting in VM-Agnostic KVM Kenta Ishiguro
2021-04-21 15:08 ` [RFC PATCH 1/2] Prevent CFS from ignoring boost requests from KVM Kenta Ishiguro
2021-04-21 15:08 ` [RFC PATCH 2/2] Boost vCPUs based on IPI-sender and receiver information Kenta Ishiguro
2021-04-21 15:43 ` Sean Christopherson
2021-04-21 16:16 ` Sean Christopherson
2021-04-21 16:19 ` Sean Christopherson [this message]
2021-04-22 12:21 ` [RFC PATCH 0/2] Mitigating Excessive Pause-Loop Exiting in VM-Agnostic KVM Wanpeng Li
2021-04-22 15:58 ` Sean Christopherson
[not found] ` <CAOOWTGJvFB_hgSUzaqNaNigdkRXFcaK37F9V7kmL3nCG+bFz5Q@mail.gmail.com>
2021-04-26 3:02 ` Wanpeng Li
2021-04-26 3:18 ` Kenta Ishiguro
2021-04-26 3:58 ` Wanpeng Li
2021-04-26 4:10 ` Kenta Ishiguro
2021-04-22 0:55 ` Wanpeng Li
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