9f114a03c6
Provide an interactive command to reset the tracepoint statistics. Requires some extra work for debugfs, as the counters cannot be reset. On the up side, this offers us the opportunity to have debugfs values reset on startup and whenever a filter is modified, becoming consistent with the tracepoint provider. As a bonus, 'kvmstat -dt' will now provide useful output, instead of mixing values in totally different orders of magnitude. Furthermore, we avoid unnecessary resets when any of the filters is "changed" interactively to the previous value. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
90 lines
1.6 KiB
Plaintext
90 lines
1.6 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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*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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*p*:: filter by PID
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*q*:: quit
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*r*:: reset stats
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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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-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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