1kvm_stat(1) 2=========== 3 4NAME 5---- 6kvm_stat - Report KVM kernel module event counters 7 8SYNOPSIS 9-------- 10[verse] 11'kvm_stat' [OPTION]... 12 13DESCRIPTION 14----------- 15kvm_stat prints counts of KVM kernel module trace events. These events signify 16state transitions such as guest mode entry and exit. 17 18This tool is useful for observing guest behavior from the host perspective. 19Often conclusions about performance or buggy behavior can be drawn from the 20output. 21While running in regular mode, use any of the keys listed in section 22'Interactive Commands' below. 23Use batch and logging modes for scripting purposes. 24 25The set of KVM kernel module trace events may be specific to the kernel version 26or architecture. It is best to check the KVM kernel module source code for the 27meaning of events. 28 29INTERACTIVE COMMANDS 30-------------------- 31[horizontal] 32*b*:: toggle events by guests (debugfs only, honors filters) 33 34*c*:: clear filter 35 36*f*:: filter by regular expression 37 38*g*:: filter by guest name 39 40*h*:: display interactive commands reference 41 42*o*:: toggle sorting order (Total vs CurAvg/s) 43 44*p*:: filter by PID 45 46*q*:: quit 47 48*r*:: reset stats 49 50*s*:: set update interval 51 52*x*:: toggle reporting of stats for child trace events 53 54Press any other key to refresh statistics immediately. 55 56OPTIONS 57------- 58-1:: 59--once:: 60--batch:: 61 run in batch mode for one second 62 63-l:: 64--log:: 65 run in logging mode (like vmstat) 66 67-t:: 68--tracepoints:: 69 retrieve statistics from tracepoints 70 71-d:: 72--debugfs:: 73 retrieve statistics from debugfs 74 75-i:: 76--debugfs-include-past:: 77 include all available data on past events for debugfs 78 79-p<pid>:: 80--pid=<pid>:: 81 limit statistics to one virtual machine (pid) 82 83-g<guest>:: 84--guest=<guest_name>:: 85 limit statistics to one virtual machine (guest name) 86 87-f<fields>:: 88--fields=<fields>:: 89 fields to display (regex) 90 91-h:: 92--help:: 93 show help message 94 95SEE ALSO 96-------- 97'perf'(1), 'trace-cmd'(1) 98 99AUTHOR 100------ 101Stefan Hajnoczi <stefanha@redhat.com> 102