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).

Performance Co-Pilot                                   PCP                                            PMDAKVM(1)