Re: [kvm-devel] [PATCH/RFC 4/4, second shot]KVM uses "account_guest_time()"
- From: Avi Kivity <avi@xxxxxxxxxxxx>
- Date: Fri, 17 Aug 2007 16:03:14 +0300
Laurent Vivier wrote:
KVM updates vtime in task_struct to allow account_guest_time() to modify user,
system and guest time in cpustat accordingly.
--- 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.
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