tools/perf/Documentation/perf-kvm.txt

   1 perf-kvm(1)
   2 ===========
   3
   4 NAME
   5 ----
   6 perf-kvm - Tool to trace/measure kvm guest os
   7
   8 SYNOPSIS
   9 --------
  10 [verse]
  11 'perf kvm' [--host] [--guest] [--guestmount=<path>
  12         [--guestkallsyms=<path> --guestmodules=<path> | --guestvmlinux=<path>]]
  13         {top|record|report|diff|buildid-list}
  14 'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>
  15         | --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat}
  16 'perf kvm stat [record|report|live] [<options>]
  17
  18 DESCRIPTION
  19 -----------
  20 There are a couple of variants of perf kvm:
  21
  22   'perf kvm [options] top <command>' to generates and displays
  23   a performance counter profile of guest os in realtime
  24   of an arbitrary workload.
  25
  26   'perf kvm record <command>' to record the performance counter profile
  27   of an arbitrary workload and save it into a perf data file. If both
  28   --host and --guest are input, the perf data file name is perf.data.kvm.
  29   If there is  no --host but --guest, the file name is perf.data.guest.
  30   If there is no --guest but --host, the file name is perf.data.host.
  31
  32   'perf kvm report' to display the performance counter profile information
  33   recorded via perf kvm record.
  34
  35   'perf kvm diff' to displays the performance difference amongst two perf.data
  36   files captured via perf record.
  37
  38   'perf kvm buildid-list' to  display the buildids found in a perf data file,
  39   so that other tools can be used to fetch packages with matching symbol tables
  40   for use by perf report.
  41
  42   'perf kvm stat <command>' to run a command and gather performance counter
  43   statistics.
  44   Especially, perf 'kvm stat record/report' generates a statistical analysis
  45   of KVM events. Currently, vmexit, mmio and ioport events are supported.
  46   'perf kvm stat record <command>' records kvm events and the events between
  47   start and end <command>.
  48   And this command produces a file which contains tracing results of kvm
  49   events.
  50
  51   'perf kvm stat report' reports statistical data which includes events
  52   handled time, samples, and so on.
  53
  54   'perf kvm stat live' reports statistical data in a live mode (similar to
  55   record + report but with statistical data updated live at a given display
  56   rate).
  57
  58 OPTIONS
  59 -------
  60 -i::
  61 --input=::
  62         Input file name.
  63 -o::
  64 --output::
  65         Output file name.
  66 --host=::
  67         Collect host side performance profile.
  68 --guest=::
  69         Collect guest side performance profile.
  70 --guestmount=<path>::
  71         Guest os root file system mount directory. Users mounts guest os
  72         root directories under <path> by a specific filesystem access method,
  73         typically, sshfs. For example, start 2 guest os. The one's pid is 8888
  74         and the other's is 9999.
  75         #mkdir ~/guestmount; cd ~/guestmount
  76         #sshfs -o allow_other,direct_io -p 5551 localhost:/ 8888/
  77         #sshfs -o allow_other,direct_io -p 5552 localhost:/ 9999/
  78         #perf kvm --host --guest --guestmount=~/guestmount top
  79 --guestkallsyms=<path>::
  80         Guest os /proc/kallsyms file copy. 'perf' kvm' reads it to get guest
  81         kernel symbols. Users copy it out from guest os.
  82 --guestmodules=<path>::
  83         Guest os /proc/modules file copy. 'perf' kvm' reads it to get guest
  84         kernel module information. Users copy it out from guest os.
  85 --guestvmlinux=<path>::
  86         Guest os kernel vmlinux.
  87
  88 STAT REPORT OPTIONS
  89 -------------------
  90 --vcpu=<value>::
  91        analyze events which occures on this vcpu. (default: all vcpus)
  92
  93 --event=<value>::
  94        event to be analyzed. Possible values: vmexit, mmio, ioport.
  95        (default: vmexit)
  96 -k::
  97 --key=<value>::
  98        Sorting key. Possible values: sample (default, sort by samples
  99        number), time (sort by average time).
 100 -p::
 101 --pid=::
 102     Analyze events only for given process ID(s) (comma separated list).
 103
 104 STAT LIVE OPTIONS
 105 -----------------
 106 -d::
 107 --display::
 108         Time in seconds between display updates
 109
 110 -m::
 111 --mmap-pages=::
 112     Number of mmap data pages (must be a power of two) or size
 113     specification with appended unit character - B/K/M/G. The
 114     size is rounded up to have nearest pages power of two value.
 115
 116 -a::
 117 --all-cpus::
 118         System-wide collection from all CPUs.
 119
 120 -p::
 121 --pid=::
 122     Analyze events only for given process ID(s) (comma separated list).
 123
 124 --vcpu=<value>::
 125        analyze events which occures on this vcpu. (default: all vcpus)
 126
 127
 128 --event=<value>::
 129        event to be analyzed. Possible values: vmexit, mmio, ioport.
 130        (default: vmexit)
 131
 132 -k::
 133 --key=<value>::
 134        Sorting key. Possible values: sample (default, sort by samples
 135        number), time (sort by average time).
 136
 137 --duration=<value>::
 138        Show events other than HLT that take longer than duration usecs.
 139
 140 SEE ALSO
 141 --------
 142 linkperf:perf-top[1], linkperf:perf-record[1], linkperf:perf-report[1],
 143 linkperf:perf-diff[1], linkperf:perf-buildid-list[1],
 144 linkperf:perf-stat[1]