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| author | David Ahern <dsahern@gmail.com> | 2012-10-08 11:17:35 -0600 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-10-08 17:14:13 -0300 |
| commit | 2aa8eab029b319b2b458b3ba393bbba31961ea96 (patch) | |
| tree | 2ce824590e3f11997ddc1989cfe8884961b3d37b /tools | |
| parent | ae86912f48b624540b886187e169bcf47a14e42a (diff) | |
| download | linux-2aa8eab029b319b2b458b3ba393bbba31961ea96.tar.bz2 | |
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 <dsahern@gmail.com>
Cc: Dong Hao <haodong@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1349716656-48165-12-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-kvm.c | 18 |
1 files 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); |