perf kvm: Refactor overall statistics

Currently the tool computes overall statistics when sort the results.
This patch refactors overall statistics during events processing,
therefore, the function update_total_coun() is not needed anymore, an
extra benefit is we can de-couple code between the statistics and the
sorting.

This patch is not expected any functionality changes.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230315145112.186603-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kvm.c

@@ -278,9 +278,14 @@ static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
 				avg_stats(&kvm_stats->stats));
 }
 
-static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
+static bool update_kvm_event(struct perf_kvm_stat *kvm,
+			     struct kvm_event *event, int vcpu_id,
 			     u64 time_diff)
 {
+	/* Update overall statistics */
+	kvm->total_count++;
+	kvm->total_time += time_diff;
+
 	if (vcpu_id == -1) {
 		kvm_update_event_stats(&event->total, time_diff);
 		return true;
@@ -399,7 +404,7 @@ static bool handle_end_event(struct perf_kvm_stat *kvm,
 		}
 	}
 
-	return update_kvm_event(event, vcpu, time_diff);
+	return update_kvm_event(kvm, event, vcpu, time_diff);
 }
 
 static
@@ -526,15 +531,6 @@ static void insert_to_result(struct rb_root *result, struct kvm_event *event,
 	rb_insert_color(&event->rb, result);
 }
 
-static void
-update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
-{
-	int vcpu = kvm->trace_vcpu;
-
-	kvm->total_count += get_event_count(event, vcpu);
-	kvm->total_time += get_event_time(event, vcpu);
-}
-
 static bool event_is_valid(struct kvm_event *event, int vcpu)
 {
 	return !!get_event_count(event, vcpu);
@@ -549,7 +545,6 @@ static void sort_result(struct perf_kvm_stat *kvm)
 	for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
 		list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
 			if (event_is_valid(event, vcpu)) {
-				update_total_count(kvm, event);
 				insert_to_result(&kvm->result, event,
 						 kvm->compare, vcpu);
 			}