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?
Luca
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