154 lines
5.0 KiB
Plaintext
154 lines
5.0 KiB
Plaintext
|
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} [<options>]
|
||
|
|
'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>
|
||
|
|
| --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat} [<options>]
|
||
|
|
'perf kvm stat [record|report|live] [<options>]
|
||
|
|
|
||
|
|
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. We set the
|
||
|
|
default behavior of perf kvm as --guest, so if neither --host nor --guest
|
||
|
|
is input, the perf data file name is perf.data.guest. If --host is input,
|
||
|
|
the perf data file name is perf.data.kvm. If you want to record data into
|
||
|
|
perf.data.host, please input --host --no-guest. The behaviors are shown as
|
||
|
|
following:
|
||
|
|
Default('') -> perf.data.guest
|
||
|
|
--host -> perf.data.kvm
|
||
|
|
--guest -> perf.data.guest
|
||
|
|
--host --guest -> perf.data.kvm
|
||
|
|
--host --no-guest -> 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. As buildid is read from /sys/kernel/notes in os, then
|
||
|
|
if you want to list the buildid for guest, please make sure your perf data file
|
||
|
|
was captured with --guestmount in perf kvm record.
|
||
|
|
|
||
|
|
'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 (x86 only) and ioport (x86 only)
|
||
|
|
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.
|
||
|
|
|
||
|
|
'perf kvm stat live' reports statistical data in a live mode (similar to
|
||
|
|
record + report but with statistical data updated live at a given display
|
||
|
|
rate).
|
||
|
|
|
||
|
|
OPTIONS
|
||
|
|
-------
|
||
|
|
-i::
|
||
|
|
--input=<path>::
|
||
|
|
Input file name, for the 'report', 'diff' and 'buildid-list' subcommands.
|
||
|
|
-o::
|
||
|
|
--output=<path>::
|
||
|
|
Output file name, for the 'record' subcommand. Doesn't work with 'report',
|
||
|
|
just redirect the output to a file when using 'report'.
|
||
|
|
--host::
|
||
|
|
Collect host side performance profile.
|
||
|
|
--guest::
|
||
|
|
Collect guest side performance profile.
|
||
|
|
|
||
|
|
:GMEXAMPLECMD: kvm --host --guest
|
||
|
|
:GMEXAMPLESUBCMD: top
|
||
|
|
include::guest-files.txt[]
|
||
|
|
|
||
|
|
-v::
|
||
|
|
--verbose::
|
||
|
|
Be more verbose (show counter open errors, etc).
|
||
|
|
|
||
|
|
STAT REPORT OPTIONS
|
||
|
|
-------------------
|
||
|
|
--vcpu=<value>::
|
||
|
|
analyze events which occur on this vcpu. (default: all vcpus)
|
||
|
|
|
||
|
|
--event=<value>::
|
||
|
|
event to be analyzed. Possible values: vmexit, mmio (x86 only),
|
||
|
|
ioport (x86 only). (default: vmexit)
|
||
|
|
-k::
|
||
|
|
--key=<value>::
|
||
|
|
Sorting key. Possible values: sample (default, sort by samples
|
||
|
|
number), time (sort by average time).
|
||
|
|
-p::
|
||
|
|
--pid=::
|
||
|
|
Analyze events only for given process ID(s) (comma separated list).
|
||
|
|
|
||
|
|
STAT LIVE OPTIONS
|
||
|
|
-----------------
|
||
|
|
-d::
|
||
|
|
--display::
|
||
|
|
Time in seconds between display updates
|
||
|
|
|
||
|
|
-m::
|
||
|
|
--mmap-pages=::
|
||
|
|
Number of mmap data pages (must be a power of two) or size
|
||
|
|
specification with appended unit character - B/K/M/G. The
|
||
|
|
size is rounded up to have nearest pages power of two value.
|
||
|
|
|
||
|
|
-a::
|
||
|
|
--all-cpus::
|
||
|
|
System-wide collection from all CPUs.
|
||
|
|
|
||
|
|
-p::
|
||
|
|
--pid=::
|
||
|
|
Analyze events only for given process ID(s) (comma separated list).
|
||
|
|
|
||
|
|
--vcpu=<value>::
|
||
|
|
analyze events which occur on this vcpu. (default: all vcpus)
|
||
|
|
|
||
|
|
|
||
|
|
--event=<value>::
|
||
|
|
event to be analyzed. Possible values: vmexit,
|
||
|
|
mmio (x86 only), ioport (x86 only).
|
||
|
|
(default: vmexit)
|
||
|
|
|
||
|
|
-k::
|
||
|
|
--key=<value>::
|
||
|
|
Sorting key. Possible values: sample (default, sort by samples
|
||
|
|
number), time (sort by average time).
|
||
|
|
|
||
|
|
--duration=<value>::
|
||
|
|
Show events other than HLT (x86 only) or Wait state (s390 only)
|
||
|
|
that take longer than duration usecs.
|
||
|
|
|
||
|
|
--proc-map-timeout::
|
||
|
|
When processing pre-existing threads /proc/XXX/mmap, it may take
|
||
|
|
a long time, because the file may be huge. A time out is needed
|
||
|
|
in such cases.
|
||
|
|
This option sets the time out limit. The default value is 500 ms.
|
||
|
|
|
||
|
|
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]
|