This patch series provides a couple of new options to make logging to files feasible. Specifically, we add command line switches to specify an arbitrary time interval for logging, and to toggle between a .csv and the previous file format. Furthermore, we allow logging to files, where we utilize a rotating set of 6 logfiles, each with its own header for easy post- processing, especially when using .csv format. Since specifying logfile size limits might be a non-trivial exercise, we're throwing in yet another command line option that allows to specify the minimum timeframe that should be covered by logs. Finally, there's a minimal systemd unit file to deploy kvm_stat-based logging in Linux distributions. Note that the decision to write our own logfiles rather than to log to e.g. systemd journal is a conscious one: It is effectively impossible to write csv records into the systemd journal, the header will either disappear after a while or has to be repeated from time to time, which defeats the purpose of having a .csv format that can be easily post- processed, etc. See individual patch description for further details. Stefan Raspl (7): tools/kvm_stat: rework command line sequence and message texts tools/kvm_stat: switch to argparse tools/kvm_stat: add command line switch '-s' to set update interval tools/kvm_stat: add command line switch '-c' to log in csv format tools/kvm_stat: add rotating log support tools/kvm_stat: add command line switch '-T' tools/kvm_stat: add sample systemd unit file tools/kvm/kvm_stat/kvm_stat | 434 +++++++++++++++++++++------- tools/kvm/kvm_stat/kvm_stat.service | 15 + tools/kvm/kvm_stat/kvm_stat.txt | 59 ++-- 3 files changed, 384 insertions(+), 124 deletions(-) create mode 100644 tools/kvm/kvm_stat/kvm_stat.service -- 2.17.1
