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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>
This commit is contained in:
David Ahern 2012-10-08 11:17:35 -06:00 committed by Arnaldo Carvalho de Melo
parent ae86912f48
commit 2aa8eab029
1 changed files with 16 additions and 2 deletions
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18
tools/perf/builtin-kvm.c
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@ -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);