Re: [kvm-devel] [PATCH/RFC 4/4, second shot]KVM uses "account_guest_time()"
From: Avi Kivity <hidden>
Date: 2007-08-17 13:03:14
Laurent Vivier wrote:
KVM updates vtime in task_struct to allow account_guest_time() to modify user, system and guest time in cpustat accordingly.
quoted hunk
--- kvm.orig/drivers/kvm/Kconfig 2007-08-17 10:24:46.000000000 +0200 +++ kvm/drivers/kvm/Kconfig 2007-08-17 10:25:25.000000000 +0200@@ -41,4 +41,10 @@ Provides support for KVM on AMD processors equipped with the AMD-V (SVM) extensions. +config GUEST_ACCOUNTING + bool "Virtual Machine accounting support" + depends on KVM + ---help--- + Allows to account CPU time used by the Virtual Machines. +
Other way round. In the patch that adds account_guest_time(), have a CONFIG_GUEST_ACCOUNTING (defaulting to n, with no description, help, or dependencies. Then, CONFIG_KVM can select GUEST_ACCOUNTING. The advantages of this are: - the puppyvisor can also select this if it so wishes - we don't have core code reference some obscure module CONFIG_PREEMPT_NOTIFIERS does the same thing. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.