From: Will Deacon <will.deacon@arm.com>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: "kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Pekka Enberg <penberg@kernel.org>
Subject: Re: [PATCH] kvmtool: ARM: timers: add "always-on" property to the device tree
Date: Fri, 20 Jun 2014 18:57:58 +0100 [thread overview]
Message-ID: <20140620175758.GG30656@arm.com> (raw)
In-Reply-To: <1403282294-10831-1-git-send-email-marc.zyngier@arm.com>
On Fri, Jun 20, 2014 at 05:38:14PM +0100, Marc Zyngier wrote:
> The new optional property "always-on" indicates that the timers
> are, well, always on when used with KVM.
>
> This allows for substantial performance improvement in the guest
> (it switches to NOHZ instead of using a periodic tick per vcpu)
> and removes a lot of burden from the host (no need to inject tons
> of interrupts with the associated rescheduling overhead).
>
> Old kernels that don't understand this property will simply ignore it.
Acked-by: Will Deacon <will.deacon@arm.com>
Will
prev parent reply other threads:[~2014-06-20 17:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-20 16:38 [PATCH] kvmtool: ARM: timers: add "always-on" property to the device tree Marc Zyngier
2014-06-20 17:57 ` Will Deacon [this message]
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