NAME

       pmdakvm - Linux virtualization performance metrics domain agent (PMDA)

DESCRIPTION

       pmdakvm  is a Performance Metrics Domain Agent (PMDA) which exports metric values from the
       Linux KVM (Kernel Virtual Machine) virtualization subsystem.

       Per-processor   KVM   trace   metrics   from   the   kernel   events   enumerated    below
       /sys/kernel/debug/tracing/events/kvm  can  be  configured  statically  using  the  pmdakvm
       configuration file, /etc/pcp/kvm/kvm.conf.

INSTALLATION

       Optionally configure trace points in the configuration file, then install the KVM PMDA  by
       using the Install script as root:

           # cd $PCP_PMDAS_DIR/kvm
           # ./Install

       To uninstall, do the following as root:

           # cd $PCP_PMDAS_DIR/kvm
           # ./Remove

       pmdakvm  is  launched  by  pmcd(1)  and should never be executed directly. The Install and
       Remove scripts notify pmcd(1) when the agent is installed or removed.

CAVEATS

       When pmdakvm is running, it holds references to kernel resources  within  the  KVM  device
       driver.   It  is  thus not possible to unload or reload the device driver module while the
       PMDA is running.  The ideal procedure to follow in order to reload the  kernel  module  is
       the  reverse  of  that  described  in  the ``INSTALLATION'' section above - i.e. first run
       ./Remove, then reload the kernel module, then run ./Install.

FILES

       $PCP_SYSCONF_DIR/kvm/kvm.conf
           configuration file for the pmdakvm agent

       $PCP_PMDAS_DIR/kvm/Install
           installation script for the pmdakvm agent

       $PCP_PMDAS_DIR/kvm/Remove
           undo installation script for the pmdakvm agent

       $PCP_LOG_DIR/pmcd/kvm.log
           default log file for error messages from pmdakvm

PCP ENVIRONMENT

       Environment variables with the prefix PCP_ are used to parameterize the file and directory
       names  used by PCP. On each installation, the file /etc/pcp.conf contains the local values
       for these variables.  The $PCP_CONF  variable  may  be  used  to  specify  an  alternative
       configuration file, as described in pcp.conf(5).

SEE ALSO

       PCPIntro(1), pmcd(1) and kvm(1).