huschi.net

KVM_STAT(1)                                                        KVM_STAT(1)
NAME
       kvm_stat - Report KVM kernel module event counters
SYNOPSIS
       kvm_stat [OPTION]...
DESCRIPTION
       kvm_stat prints counts of KVM kernel module trace events. These events
       signify state transitions such as guest mode entry and exit.
       This tool is useful for observing guest behavior from the host
       perspective. Often conclusions about performance or buggy behavior can
       be drawn from the output. While running in regular mode, use any of the
       keys listed in section Interactive Commands below. Use batch and
       logging modes for scripting purposes.
       The set of KVM kernel module trace events may be specific to the kernel
       version or architecture. It is best to check the KVM kernel module
       source code for the meaning of events.
INTERACTIVE COMMANDS
       b   toggle events by guests
           (debugfs only, honors
           filters)
       c   clear filter
       f   filter by regular
           expression
           Note: Child events pull in
           their parents, and
           parents' stats summarize
           all child events, not just
           the filtered ones
       g   filter by guest name/PID
       h   display interactive
           commands reference
       o   toggle sorting order
           (Total vs CurAvg/s)
       p   filter by guest name/PID
       q   quit
       r   reset stats
       s   set delay between refreshs
       x   toggle reporting of stats
           for child trace events
           Note: The stats for the
           parents summarize the
           respective child trace
           events
       Press any other key to refresh statistics immediately.
OPTIONS
       -1, --once, --batch
           run in batch mode for one second
       -c, --csv
           log in csv format. Requires option -l/--log or -L/--log-to-file.
           When used with option -L/--log-to-file, the header is only ever
           written to start of file to preserve the format.
       -d, --debugfs
           retrieve statistics from debugfs
       -f<fields>, --fields=<fields>
           fields to display (regex), "-f help" for a list of available events
       -g<guest>, --guest=<guest_name>
           limit statistics to one virtual machine (guest name)
       -h, --help
           show help message
       -i, --debugfs-include-past
           include all available data on past events for debugfs
       -l, --log
           run in logging mode (like vmstat)
       -L<file>, --log-to-file=<file>
           like -l/--log, but logging to a file. Appends to existing files.
       -p<pid>, --pid=<pid>
           limit statistics to one virtual machine (pid)
       -s, --set-delay
           set delay between refreshs (value range: 0.1-25.5 secs)
       -t, --tracepoints
           retrieve statistics from tracepoints
       -z, --skip-zero-records
           omit records with all zeros in logging mode
SEE ALSO
       perf(1), trace-cmd(1)
AUTHOR
       Stefan Hajnoczi <stefanha AT redhat.com>
                                  12/12/2024                       KVM_STAT(1)