linux-kernel - Re: [PATCH] perf stat: Fix uncore event mixed metric with workload error issue

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Date:   Wed, 29 Apr 2020 10:16:39 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Jin Yao <yao.jin@...ux.intel.com>, acme@...nel.org,
        jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH] perf stat: Fix uncore event mixed metric with workload
 error issue

On Tue, Apr 28, 2020 at 02:19:22PM -0700, Andi Kleen wrote:
> > I wonder this would break some expectations.. would it be
> > more safe to detect duration event and bypass it from the
> > decission? but maybe the case I'm worried about is not a
> > problem at all.. Andi?
> 
> Don't see what it would break.
> 
> Yes maybe we need to special case duration_time more, but that would
> be a much bigger patch.

would below change work for you? if duration_time is the only
case, I'd rather go with the special case for it

jirka


---
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9207b6c45475..2518204cffd1 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1853,6 +1853,8 @@ static void setup_system_wide(int forks)
 		struct evsel *counter;
 
 		evlist__for_each_entry(evsel_list, counter) {
+			if (counter->tool_event == PERF_TOOL_DURATION_TIME)
+				continue;
 			if (!counter->core.system_wide)
 				return;
 		}