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authorDavid Ahern <dsahern@gmail.com>2012-10-08 11:17:35 -0600
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-10-08 17:14:13 -0300
commit2aa8eab029b319b2b458b3ba393bbba31961ea96 (patch)
tree2ce824590e3f11997ddc1989cfe8884961b3d37b /tools/perf/builtin-kvm.c
parentae86912f48b624540b886187e169bcf47a14e42a (diff)
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/perf/builtin-kvm.c')
-rw-r--r--tools/perf/builtin-kvm.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 260abc535b5..b98095edf1f 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);