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