linux/tools/perf/Documentation/perf-kvm.txt

perf-kvm(1)
===========

NAME
----
perf-kvm - Tool to trace/measure kvm guest os

SYNOPSIS
--------
[verse]
'perf kvm' [--host] [--guest] [--guestmount=<path>
	[--guestkallsyms=<path> --guestmodules=<path> | --guestvmlinux=<path>]]
	{top|record|report|diff|buildid-list}
'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>
	| --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat}

DESCRIPTION
-----------
There are a couple of variants of perf kvm:

  'perf kvm [options] top <command>' to generates and displays
  a performance counter profile of guest os in realtime
  of an arbitrary workload.

  'perf kvm record <command>' to record the performance counter profile
  of an arbitrary workload and save it into a perf data file. If both
  --host and --guest are input, the perf data file name is perf.data.kvm.
  If there is  no --host but --guest, the file name is perf.data.guest.
  If there is no --guest but --host, the file name is perf.data.host.

  'perf kvm report' to display the performance counter profile information
  recorded via perf kvm record.

  'perf kvm diff' to displays the performance difference amongst two perf.data
  files captured via perf record.

  'perf kvm buildid-list' to  display the buildids found in a perf data file,
  so that other tools can be used to fetch packages with matching symbol tables
  for use by perf report.

  'perf kvm stat <command>' to run a command and gather performance counter
  statistics.
  Especially, perf 'kvm stat record/report' generates a statistical analysis
  of KVM events. Currently, vmexit, mmio and ioport events are supported.
  'perf kvm stat record <command>' records kvm events and the events between
  start and end <command>.
  And this command produces a file which contains tracing results of kvm
  events.

  'perf kvm stat report' reports statistical data which includes events
  handled time, samples, and so on.

OPTIONS
-------
-i::
--input=::
        Input file name.
-o::
--output::
        Output file name.
--host=::
        Collect host side performance profile.
--guest=::
        Collect guest side performance profile.
--guestmount=<path>::
	Guest os root file system mount directory. Users mounts guest os
        root directories under <path> by a specific filesystem access method,
	typically, sshfs. For example, start 2 guest os. The one's pid is 8888
	and the other's is 9999.
        #mkdir ~/guestmount; cd ~/guestmount
        #sshfs -o allow_other,direct_io -p 5551 localhost:/ 8888/
        #sshfs -o allow_other,direct_io -p 5552 localhost:/ 9999/
        #perf kvm --host --guest --guestmount=~/guestmount top
--guestkallsyms=<path>::
        Guest os /proc/kallsyms file copy. 'perf' kvm' reads it to get guest
	kernel symbols. Users copy it out from guest os.
--guestmodules=<path>::
	Guest os /proc/modules file copy. 'perf' kvm' reads it to get guest
	kernel module information. Users copy it out from guest os.
--guestvmlinux=<path>::
	Guest os kernel vmlinux.

STAT REPORT OPTIONS
-------------------
--vcpu=<value>::
       analyze events which occures on this vcpu. (default: all vcpus)

--events=<value>::
       events to be analyzed. Possible values: vmexit, mmio, ioport.
       (default: vmexit)
-k::
--key=<value>::
       Sorting key. Possible values: sample (default, sort by samples
       number), time (sort by average time).

SEE ALSO
--------
linkperf:perf-top[1], linkperf:perf-record[1], linkperf:perf-report[1],
linkperf:perf-diff[1], linkperf:perf-buildid-list[1],
linkperf:perf-stat[1]