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 rather 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 Same stats options for the record+report path work with the live mode. Display rate defaults to 1 and can be changed using the -d option. The command works fine for low event rates, but as the number of events increases (e.g., building a kernel in a 4-vcpu VM or nested virtualization) the ordered samples code is failing. e.g, ... Total Samples:76309, Total events handled time:1121314.04us. Warning: Timestamp below last timeslice flush Failed to process event This is on a 16-cpu server. For the kernel build in a 4 vcpu VM I am seeing on the order of 50,000+ events per second and in the case of nested virtualization (at least this one use case) I am seeing on the order of 100,000+ events per second. Not surprising it's having problems keeping up. I'll continue poking around the ordered samples code, but wanted to kick this out in case someone has ideas or objections to the approach. David Ahern (12): perf evlist: restore some methods removed in an earlier cleanup perf evlist: move tracepoint processing code to evlist.c perf evlist: add initialzation function for tracepoints perf session: export a few functions for event processing perf top: move CONSOLE_CLEAR to header file perf kvm: remove typecast in init_kvm_event_record perf kvm: handle realloc failures perf kvm: add braces around multi-line statements perf kvm: split out tracepoints from record args perf kvm: total count is a u64, print as so perf kvm: only process events for vcpus of interest perf kvm: add live mode tools/perf/builtin-kvm.c | 717 ++++++++++++++++++++++++++++++++++++++++++--- tools/perf/builtin-top.c | 2 - tools/perf/util/evlist.c | 120 ++++++++ tools/perf/util/evlist.h | 10 + tools/perf/util/header.c | 39 --- tools/perf/util/session.c | 15 +- tools/perf/util/session.h | 9 + tools/perf/util/top.h | 2 + 8 files changed, 819 insertions(+), 95 deletions(-) -- 1.7.10.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
