From 2aa8eab029b319b2b458b3ba393bbba31961ea96 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Mon, 8 Oct 2012 11:17:35 -0600 Subject: [PATCH] perf kvm: Only process events for vcpus of interest Minimizing processing overhead for each sample - which becomes important for the upcoming live mode when it has to deal with 100+k events per second. Signed-off-by: David Ahern Cc: Dong Hao Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Xiao Guangrong Link: http://lkml.kernel.org/r/1349716656-48165-12-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-kvm.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index 260abc535b5b..b98095edf1f4 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -416,7 +416,10 @@ static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event) static bool update_kvm_event(struct kvm_event *event, int vcpu_id, u64 time_diff) { - kvm_update_event_stats(&event->total, time_diff); + if (vcpu_id == -1) { + kvm_update_event_stats(&event->total, time_diff); + return true; + } if (!kvm_event_expand(event, vcpu_id)) return false; @@ -432,6 +435,12 @@ static bool handle_end_event(struct perf_kvm *kvm, { struct kvm_event *event; u64 time_begin, time_diff; + int vcpu; + + if (kvm->trace_vcpu == -1) + vcpu = -1; + else + vcpu = vcpu_record->vcpu_id; event = vcpu_record->last_event; time_begin = vcpu_record->start_time; @@ -461,7 +470,7 @@ static bool handle_end_event(struct perf_kvm *kvm, BUG_ON(timestamp < time_begin); time_diff = timestamp - time_begin; - return update_kvm_event(event, vcpu_record->vcpu_id, time_diff); + return update_kvm_event(event, vcpu, time_diff); } static @@ -498,6 +507,11 @@ static bool handle_kvm_event(struct perf_kvm *kvm, if (!vcpu_record) return true; + /* only process events for vcpus user cares about */ + if ((kvm->trace_vcpu != -1) && + (kvm->trace_vcpu != vcpu_record->vcpu_id)) + return true; + if (kvm->events_ops->is_begin_event(evsel, sample, &key)) return handle_begin_event(kvm, vcpu_record, &key, sample->time); -- GitLab