Editing Kernel configuration

== ACPI sleep ==

It is a bit tricky to make ACPI sleep and OpenVZ work together.

ACPI sleep is enabled by <code>ACPI_SLEEP</code> kernel option. The following dependencies are declared in kernel configs:

 ACPI_SLEEP depends on X86 && (!SMP || SUSPEND_SMP)
 SUSPEND_SMP depends on HOTPLUG_CPU && X86 && PM
 FAIRSCHED depends on SCHED_VCPU

And <code>SCHED_VCPU</code> is incompatible with <code>HOTPLUG_CPU</code>:

 ./kernel/cpu.c:#error "CONFIG_HOTPLUG_CPU isn't supported with CONFIG_SCHED_VCPU"

On non-SMP machine, you may disable <code>SMP</code>, this will resolve the conflict.

If you have SMP machine, you can only disable <code>FAIRSCHED</code> and <code>SCHED_VCPU</code>. This will loose isolation between VEs (scheduling will be performed per-task, not per-VE), but it is acceptable solution if your VEs are trusted (and it's hard to imagine untrusted VEs on notebook ;)

[[Category:Kernel]]