From: Marc Zyngier <maz@kernel.org>
To: shawnguo@kernel.org, linux@rasmusvillemoes.dk,
leoyang.li@nxp.com, mark.rutland@arm.com, zhiqiang.hou@nxp.com,
Biwen Li <biwen.li@oss.nxp.com>,
robh+dt@kernel.org, tglx@linutronix.de,
kvmarm@lists.cs.columbia.edu, Will Deacon <will@kernel.org>,
kvm@vger.kernel.org, Eric Auger <eric.auger@redhat.com>,
Christoffer Dall <christoffer.dall@arm.com>,
linux-arm-kernel@lists.infradead.org,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Shenming Lu <lushenming@huawei.com>,
James Morse <james.morse@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org,
Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: xiaobo.xie@nxp.com, Hou Zhiqiang <Zhiqiang.Hou@nxp.com>,
devicetree@vger.kernel.org, Biwen Li <biwen.li@nxp.com>,
jiafei.pan@nxp.com, yuzenghui@huawei.com,
wanghaibin.wang@huawei.com
Subject: Re: [PATCH v2 0/2] KVM: arm64: Optimize the wait for the completion of the VPT analysis
Date: Fri, 11 Dec 2020 15:01:39 +0000 [thread overview]
Message-ID: <160769813659.482133.2716418035359567004.b4-ty@kernel.org> (raw)
In-Reply-To: <20201128141857.983-1-lushenming@huawei.com>
On Sat, 28 Nov 2020 22:18:55 +0800, Shenming Lu wrote:
> Right after a vPE is made resident, the code starts polling the
> GICR_VPENDBASER.Dirty bit until it becomes 0, where the delay_us
> is set to 10. But in our measurement, it takes only hundreds of
> nanoseconds, or 1~2 microseconds, to finish parsing the VPT in most
> cases. What's more, we found that the MMIO delay on GICv4.1 system
> (HiSilicon) is about 10 times higher than that on GICv4.0 system in
> kvm-unit-tests (the specific data is as follows).
>
> [...]
Applied to irq/irqchip-next, thanks!
[1/2] irqchip/gic-v4.1: Reduce the delay time of the poll on the GICR_VPENDBASER.Dirty bit
commit: 0b39498230ae53e6af981141be99f4c7d5144de6
Patch 2 will be routed via the KVM/arm64 tree.
Cheers,
M.
--
Without deviation from the norm, progress is not possible.
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: shawnguo@kernel.org, linux@rasmusvillemoes.dk,
leoyang.li@nxp.com, mark.rutland@arm.com, zhiqiang.hou@nxp.com,
Biwen Li <biwen.li@oss.nxp.com>,
robh+dt@kernel.org, tglx@linutronix.de,
kvmarm@lists.cs.columbia.edu, Will Deacon <will@kernel.org>,
kvm@vger.kernel.org, Eric Auger <eric.auger@redhat.com>,
Christoffer Dall <christoffer.dall@arm.com>,
linux-arm-kernel@lists.infradead.org,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Shenming Lu <lushenming@huawei.com>,
James Morse <james.morse@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org,
Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: devicetree@vger.kernel.org, Biwen Li <biwen.li@nxp.com>,
Hou Zhiqiang <Zhiqiang.Hou@nxp.com>,
xiaobo.xie@nxp.com, jiafei.pan@nxp.com
Subject: Re: [PATCH v2 0/2] KVM: arm64: Optimize the wait for the completion of the VPT analysis
Date: Fri, 11 Dec 2020 15:01:39 +0000 [thread overview]
Message-ID: <160769813659.482133.2716418035359567004.b4-ty@kernel.org> (raw)
In-Reply-To: <20201128141857.983-1-lushenming@huawei.com>
On Sat, 28 Nov 2020 22:18:55 +0800, Shenming Lu wrote:
> Right after a vPE is made resident, the code starts polling the
> GICR_VPENDBASER.Dirty bit until it becomes 0, where the delay_us
> is set to 10. But in our measurement, it takes only hundreds of
> nanoseconds, or 1~2 microseconds, to finish parsing the VPT in most
> cases. What's more, we found that the MMIO delay on GICv4.1 system
> (HiSilicon) is about 10 times higher than that on GICv4.0 system in
> kvm-unit-tests (the specific data is as follows).
>
> [...]
Applied to irq/irqchip-next, thanks!
[1/2] irqchip/gic-v4.1: Reduce the delay time of the poll on the GICR_VPENDBASER.Dirty bit
commit: 0b39498230ae53e6af981141be99f4c7d5144de6
Patch 2 will be routed via the KVM/arm64 tree.
Cheers,
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: shawnguo@kernel.org, linux@rasmusvillemoes.dk,
leoyang.li@nxp.com, mark.rutland@arm.com, zhiqiang.hou@nxp.com,
Biwen Li <biwen.li@oss.nxp.com>,
robh+dt@kernel.org, tglx@linutronix.de,
kvmarm@lists.cs.columbia.edu, Will Deacon <will@kernel.org>,
kvm@vger.kernel.org, Eric Auger <eric.auger@redhat.com>,
Christoffer Dall <christoffer.dall@arm.com>,
linux-arm-kernel@lists.infradead.org,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Shenming Lu <lushenming@huawei.com>,
James Morse <james.morse@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org,
Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: devicetree@vger.kernel.org, Biwen Li <biwen.li@nxp.com>,
Hou Zhiqiang <Zhiqiang.Hou@nxp.com>,
xiaobo.xie@nxp.com, yuzenghui@huawei.com,
wanghaibin.wang@huawei.com, jiafei.pan@nxp.com
Subject: Re: [PATCH v2 0/2] KVM: arm64: Optimize the wait for the completion of the VPT analysis
Date: Fri, 11 Dec 2020 15:01:39 +0000 [thread overview]
Message-ID: <160769813659.482133.2716418035359567004.b4-ty@kernel.org> (raw)
In-Reply-To: <20201128141857.983-1-lushenming@huawei.com>
On Sat, 28 Nov 2020 22:18:55 +0800, Shenming Lu wrote:
> Right after a vPE is made resident, the code starts polling the
> GICR_VPENDBASER.Dirty bit until it becomes 0, where the delay_us
> is set to 10. But in our measurement, it takes only hundreds of
> nanoseconds, or 1~2 microseconds, to finish parsing the VPT in most
> cases. What's more, we found that the MMIO delay on GICv4.1 system
> (HiSilicon) is about 10 times higher than that on GICv4.0 system in
> kvm-unit-tests (the specific data is as follows).
>
> [...]
Applied to irq/irqchip-next, thanks!
[1/2] irqchip/gic-v4.1: Reduce the delay time of the poll on the GICR_VPENDBASER.Dirty bit
commit: 0b39498230ae53e6af981141be99f4c7d5144de6
Patch 2 will be routed via the KVM/arm64 tree.
Cheers,
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-12-11 15:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-28 14:18 [PATCH v2 0/2] KVM: arm64: Optimize the wait for the completion of the VPT analysis Shenming Lu
2020-11-28 14:18 ` Shenming Lu
2020-11-28 14:18 ` Shenming Lu
2020-11-28 14:18 ` [PATCH v2 1/2] irqchip/gic-v4.1: Reduce the delay time of the poll on the GICR_VPENDBASER.Dirty bit Shenming Lu
2020-11-28 14:18 ` Shenming Lu
2020-11-28 14:18 ` Shenming Lu
2020-12-11 14:58 ` [irqchip: irq/irqchip-next] irqchip/gic-v4.1: Reduce the delay when polling GICR_VPENDBASER.Dirty irqchip-bot for Shenming Lu
2020-11-28 14:18 ` [PATCH v2 2/2] KVM: arm64: Delay the execution of the polling on the GICR_VPENDBASER.Dirty bit Shenming Lu
2020-11-28 14:18 ` Shenming Lu
2020-11-28 14:18 ` Shenming Lu
2020-11-30 11:22 ` Marc Zyngier
2020-11-30 11:22 ` Marc Zyngier
2020-11-30 11:22 ` Marc Zyngier
2020-11-30 12:12 ` Shenming Lu
2020-11-30 12:12 ` Shenming Lu
2020-11-30 12:12 ` Shenming Lu
2020-11-30 12:28 ` Marc Zyngier
2020-11-30 12:28 ` Marc Zyngier
2020-11-30 12:28 ` Marc Zyngier
2020-12-11 15:01 ` Marc Zyngier [this message]
2020-12-11 15:01 ` [PATCH v2 0/2] KVM: arm64: Optimize the wait for the completion of the VPT analysis Marc Zyngier
2020-12-11 15:01 ` Marc Zyngier
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