mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 11:51:27 +00:00
9a6d316692
Update perf-kvm documentation with new live subcommand. Add -p/--pid option for perf-kvm-stat-report as well. Signed-off-by: David Ahern <dsahern@gmail.com> Requested-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1375926999-75129-2-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
143 lines
4.5 KiB
Plaintext
143 lines
4.5 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}
|
|
'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>
|
|
| --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat}
|
|
'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. 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.
|
|
|
|
'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=::
|
|
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)
|
|
|
|
--event=<value>::
|
|
event 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).
|
|
-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.
|
|
|
|
-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 occures on this vcpu. (default: all vcpus)
|
|
|
|
|
|
--event=<value>::
|
|
event 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).
|
|
|
|
--duration=<value>::
|
|
Show events other than HLT that take longer than duration usecs.
|
|
|
|
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]
|