linux-kernel - [PATCH v4 01/16] perf kvm: Refactor overall statistics

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Date:   Mon, 13 Mar 2023 19:40:03 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.g.garry@...cle.com>,
        James Clark <james.clark@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v4 01/16] 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.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
Reviewed-by: James Clark <james.clark@....com>
---
 tools/perf/builtin-kvm.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 641e739c717c..0172e5b0d26e 100644
--- a/tools/perf/builtin-kvm.c
+++ b/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);
 			}
-- 
2.34.1