101 строка
3.5 KiB
Plaintext
101 строка
3.5 KiB
Plaintext
perf-kvm(1)
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===========
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NAME
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----
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perf-kvm - Tool to trace/measure kvm guest os
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SYNOPSIS
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--------
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[verse]
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'perf kvm' [--host] [--guest] [--guestmount=<path>
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[--guestkallsyms=<path> --guestmodules=<path> | --guestvmlinux=<path>]]
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{top|record|report|diff|buildid-list}
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'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>
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| --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat}
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DESCRIPTION
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-----------
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There are a couple of variants of perf kvm:
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'perf kvm [options] top <command>' to generates and displays
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a performance counter profile of guest os in realtime
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of an arbitrary workload.
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'perf kvm record <command>' to record the performance counter profile
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of an arbitrary workload and save it into a perf data file. If both
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--host and --guest are input, the perf data file name is perf.data.kvm.
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If there is no --host but --guest, the file name is perf.data.guest.
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If there is no --guest but --host, the file name is perf.data.host.
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'perf kvm report' to display the performance counter profile information
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recorded via perf kvm record.
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'perf kvm diff' to displays the performance difference amongst two perf.data
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files captured via perf record.
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'perf kvm buildid-list' to display the buildids found in a perf data file,
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so that other tools can be used to fetch packages with matching symbol tables
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for use by perf report.
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'perf kvm stat <command>' to run a command and gather performance counter
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statistics.
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Especially, perf 'kvm stat record/report' generates a statistical analysis
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of KVM events. Currently, vmexit, mmio and ioport events are supported.
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'perf kvm stat record <command>' records kvm events and the events between
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start and end <command>.
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And this command produces a file which contains tracing results of kvm
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events.
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'perf kvm stat report' reports statistical data which includes events
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handled time, samples, and so on.
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OPTIONS
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-------
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-i::
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--input=::
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Input file name.
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-o::
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--output::
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Output file name.
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--host=::
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Collect host side performance profile.
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--guest=::
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Collect guest side performance profile.
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--guestmount=<path>::
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Guest os root file system mount directory. Users mounts guest os
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root directories under <path> by a specific filesystem access method,
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typically, sshfs. For example, start 2 guest os. The one's pid is 8888
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and the other's is 9999.
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#mkdir ~/guestmount; cd ~/guestmount
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#sshfs -o allow_other,direct_io -p 5551 localhost:/ 8888/
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#sshfs -o allow_other,direct_io -p 5552 localhost:/ 9999/
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#perf kvm --host --guest --guestmount=~/guestmount top
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--guestkallsyms=<path>::
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Guest os /proc/kallsyms file copy. 'perf' kvm' reads it to get guest
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kernel symbols. Users copy it out from guest os.
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--guestmodules=<path>::
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Guest os /proc/modules file copy. 'perf' kvm' reads it to get guest
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kernel module information. Users copy it out from guest os.
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--guestvmlinux=<path>::
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Guest os kernel vmlinux.
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STAT REPORT OPTIONS
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-------------------
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--vcpu=<value>::
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analyze events which occures on this vcpu. (default: all vcpus)
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--events=<value>::
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events to be analyzed. Possible values: vmexit, mmio, ioport.
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(default: vmexit)
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-k::
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--key=<value>::
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Sorting key. Possible values: sample (default, sort by samples
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number), time (sort by average time).
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SEE ALSO
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--------
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linkperf:perf-top[1], linkperf:perf-record[1], linkperf:perf-report[1],
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linkperf:perf-diff[1], linkperf:perf-buildid-list[1],
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linkperf:perf-stat[1]
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