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. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
