perf kvm: Add live mode
perf kvm stat currently requires back to back record and report commands to see stats. e.g,. perf kvm stat record -p $pid -- sleep 1 perf kvm stat report This is inconvenvient for on box monitoring of a VM. This patch introduces a 'live' mode that in effect combines the record plus report into one command. e.g., to monitor a single VM: perf kvm stat live -p $pid or all VMs: perf kvm stat live Same stats options for the record+report path work with the live mode. Display rate defaults to 1 second and can be changed using the -d option. v4: - address comments from Xiao -- verify_vcpu check should not look at processors on line for the host, prune configurable options. - set attr->{mmap,comm,task} to 0 - don't need task events so trim events we have to deal with - better control of time for queue event flushing to reduce frequency of "Timestamp below last timeslice flush" failures. v3: updated to use existing tracepoint parsing code v2: removed ABSTIME arg from timerfd_settime as mentioned by Namhyung only call perf_kvm__handle_stdin when poll returns activity. Signed-off-by: NDavid Ahern <dsahern@gmail.com> Reviewed-by: NXiao 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/1375753297-69645-3-git-send-email-dsahern@gmail.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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