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} 16 17 DESCRIPTION 18 ----------- 19 There 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 41 OPTIONS 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 71 SEE ALSO 72 -------- 73 linkperf:perf-top[1], linkperf:perf-record[1], linkperf:perf-report[1], 74 linkperf:perf-diff[1], linkperf:perf-buildid-list[1] 75
