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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | INSTALLATION | CAVEATS | FILES | PCP ENVIRONMENT | DEBUGGING OPTIONS | SEE ALSO | COLOPHON |
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PMDAKVM(1) General Commands Manual PMDAKVM(1)
pmdakvm - Linux virtualization performance metrics domain agent
(PMDA)
$PCP_PMDAS_DIR/kvm/pmdakvm [-D debug]
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.
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.
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.
$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
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).
The -D or --debug option enables the output of additional
diagnostics on stderr to help triage problems, although the
information is sometimes cryptic and primarily intended to provide
guidance for developers rather end-users. debug is a comma
separated list of debugging options; use pmdbg(1) with the -l
option to obtain a list of the available debugging options and
their meaning.
PCPIntro(1), pmcd(1) and kvm(1).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-11.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Performance Co-Pilot PCP PMDAKVM(1)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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