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kvm_stat.txt
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kvm_stat.txt
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kvm_stat(1)
===========
NAME
----
kvm_stat - Report KVM kernel module event counters
SYNOPSIS
--------
[verse]
'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
--------------------
[horizontal]
*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 <[email protected]>