perf: 'perf kvm' tool for monitoring guest performance from host
Here is the patch of userspace perf tool.
Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt
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+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}
+
+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 couinter 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.
+
+OPTIONS
+-------
+--host=::
+ Collect host side perforamnce profile.
+--guest=::
+ Collect guest side perforamnce 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.
+
+SEE ALSO
+--------
+linkperf:perf-top[1] perf-record[1] perf-report[1] perf-diff[1] perf-buildid-list[1]