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Date: Wed, 11 Jul 2007 22:10:07 +0200 From: Luca <kronos.it@...il.com> To: "Avi Kivity" <avi@...ranet.com> Cc: kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org Subject: Re: [kvm-devel] [PATCH 2/2] KVM: Use the scheduler preemption hooks to make kvm preemptible On 7/11/07, Avi Kivity <avi@...ranet.com> wrote: > Current kvm disables preemption while the new virtualization registers are > in use. This of course is not very good for latency sensitive workloads (one > use of virtualization is to offload user interface and other latency > insensitive stuff to a container, so that it is easier to analyze the > remaining workload). This patch re-enables preemption for kvm; preemption > is now only disabled when switching the registers in and out, and during > the switch to guest mode and back. [...] > diff --git a/drivers/kvm/Kconfig b/drivers/kvm/Kconfig > index 33fa28a..92644b5 100644 > --- a/drivers/kvm/Kconfig > +++ b/drivers/kvm/Kconfig > @@ -10,7 +10,7 @@ if VIRTUALIZATION > > config KVM > tristate "Kernel-based Virtual Machine (KVM) support" > - depends on X86 && EXPERIMENTAL > + depends on X86 && EXPERIMENTAL && PREEMPT_HOOKS > depends on X86_CMPXCHG64 || 64BIT select PREEMPT_HOOKS maybe? Luca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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