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

1perf-kvm(1)
2===========
3
4NAME
5----
6perf-kvm - Tool to trace/measure kvm guest os
7
8SYNOPSIS
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}
16
17DESCRIPTION
18-----------
19There are a couple of variants of perf kvm:
20
21  'perf kvm [options] top <command>' to generates and displays
22  a performance counter profile of guest os in realtime
23  of an arbitrary workload.
24
25  'perf kvm record <command>' to record the performance counter profile
26  of an arbitrary workload and save it into a perf data file. If both
27  --host and --guest are input, the perf data file name is perf.data.kvm.
28  If there is no --host but --guest, the file name is perf.data.guest.
29  If there is no --guest but --host, the file name is perf.data.host.
30
31  'perf kvm report' to display the performance counter profile information
32  recorded via perf kvm record.
33
34  'perf kvm diff' to displays the performance difference amongst two perf.data
35  files captured via perf record.
36
37  'perf kvm buildid-list' to display the buildids found in a perf data file,
38  so that other tools can be used to fetch packages with matching symbol tables
39  for use by perf report.
40
41OPTIONS
42-------
43-i::
44--input=::
45        Input file name.
46-o::
47--output::
48        Output file name.
49--host=::
50        Collect host side performance profile.
51--guest=::
52        Collect guest side performance profile.
53--guestmount=<path>::
54    Guest os root file system mount directory. Users mounts guest os
55        root directories under <path> by a specific filesystem access method,
56    typically, sshfs. For example, start 2 guest os. The one's pid is 8888
57    and the other's is 9999.
58        #mkdir ~/guestmount; cd ~/guestmount
59        #sshfs -o allow_other,direct_io -p 5551 localhost:/ 8888/
60        #sshfs -o allow_other,direct_io -p 5552 localhost:/ 9999/
61        #perf kvm --host --guest --guestmount=~/guestmount top
62--guestkallsyms=<path>::
63        Guest os /proc/kallsyms file copy. 'perf' kvm' reads it to get guest
64    kernel symbols. Users copy it out from guest os.
65--guestmodules=<path>::
66    Guest os /proc/modules file copy. 'perf' kvm' reads it to get guest
67    kernel module information. Users copy it out from guest os.
68--guestvmlinux=<path>::
69    Guest os kernel vmlinux.
70
71SEE ALSO
72--------
73linkperf:perf-top[1], linkperf:perf-record[1], linkperf:perf-report[1],
74linkperf:perf-diff[1], linkperf:perf-buildid-list[1]
75

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