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https://github.com/torvalds/linux
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fff8c9eb48
Child trace events were included in calculation of the overall total, which is used for calculation of the percentages of the '%Total' column. However, the parent trace envents' stats summarize the child trace events, hence we'd incorrectly account for them twice, leading to slightly wrong stats. With this fix, we use the correct total. Consequently, the sum of the child trace events' '%Total' column values is identical to the respective value of the respective parent event. However, this also means that the sum of the '%Total' column values will aggregate to more than 100 percent. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
104 lines
2 KiB
Plaintext
104 lines
2 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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:: *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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-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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