Luca wrote: > On 7/11/07, Avi Kivity <[EMAIL PROTECTED]> 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? >
Yes. And default PREEMPT_HOOKS to n in the first patch. I'll make both these changes. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
