![Stefan Raspl](/assets/img/avatar_default.png)
Toggle display total number of events by guest (debugfs only). When switching to display of events by guest, field filters remain active. I.e. the number of events per guest reported considers only events matching the filters. Likewise with pid/guest filtering. Note that when switching to display of events by guest, DebugfsProvider remains to collect data for events as it did before, but the read() method summarizes the values by pid. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
102 lines
1.9 KiB
Plaintext
102 lines
1.9 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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*g*:: filter by guest name
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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 PID
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*q*:: quit
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*r*:: reset stats
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*s*:: set update interval
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*x*:: toggle reporting of stats for child trace 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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-l::
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--log::
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run in logging mode (like vmstat)
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-t::
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--tracepoints::
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retrieve statistics from tracepoints
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-d::
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--debugfs::
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retrieve statistics from debugfs
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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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-p<pid>::
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--pid=<pid>::
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limit statistics to one virtual machine (pid)
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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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-f<fields>::
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--fields=<fields>::
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fields to display (regex)
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-h::
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--help::
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show help message
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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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