linux-kernel - Re: [RFC PATCH] perf pmu-events: Don't lower case MetricExpr

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Date:   Wed, 12 Jan 2022 14:50:01 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Kan Liang <kan.liang@...ux.intel.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,
        eranian@...gle.com
Subject: Re: [RFC PATCH] perf pmu-events: Don't lower case MetricExpr

Em Wed, Jan 12, 2022 at 02:45:07PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Jan 12, 2022 at 09:22:51AM -0800, Ian Rogers escreveu:
> > On Thu, Nov 25, 2021 at 11:13 PM Ian Rogers <irogers@...gle.com> wrote:
> > >
> > > This patch changes MetricExpr to be written out in the same case. This
> > > enables events in metrics to use modifiers like 'G' which currently
> > > yield parse errors when made lower case. To keep tests passing the
> > > literal #smt_on is compared in a non-case sensitive way - #SMT_on is
> > > present in at least SkylakeX metrics.
> > 
> > Ping.
> 
> I tried applying 20211124001231.3277836-1-irogers@...gle.com on top of
> your perf_cpu series, it failed, will check.
> 
> BTW, I got the two other patches in that series:
> 
> ⬢[acme@...lbox perf]$ git log --oneline -2
> 6dd8646939a770e4 (HEAD -> perf/core) perf tools: Probe non-deprecated sysfs path 1st
> 0ce05781f4905fcf perf tools: Fix SMT fallback with large core counts
> ⬢[acme@...lbox perf]$

It was due to that cpu__max_present_cpu().cpu;

Fixed, applied.

- Arnaldo

diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index e808738493e219fd..c94fb9bef919f5cb 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -405,12 +405,17 @@ double expr_id_data__source_count(const struct expr_id_data *data)
 double expr__get_literal(const char *literal)
 {
 	static struct cpu_topology *topology;
+	double result = NAN;
 
-	if (!strcmp("#smt_on", literal))
-		return smt_on() > 0 ? 1.0 : 0.0;
+	if (!strcmp("#smt_on", literal)) {
+		result = smt_on() > 0 ? 1.0 : 0.0;
+		goto out;
+	}
 
-	if (!strcmp("#num_cpus", literal))
-		return cpu__max_present_cpu().cpu;
+	if (!strcmp("#num_cpus", literal)) {
+		result = cpu__max_present_cpu().cpu;
+		goto out;
+	}
 
 	/*
 	 * Assume that topology strings are consistent, such as CPUs "0-1"
@@ -422,16 +427,24 @@ double expr__get_literal(const char *literal)
 		topology = cpu_topology__new();
 		if (!topology) {
 			pr_err("Error creating CPU topology");
-			return NAN;
+			goto out;
 		}
 	}
-	if (!strcmp("#num_packages", literal))
-		return topology->package_cpus_lists;
-	if (!strcmp("#num_dies", literal))
-		return topology->die_cpus_lists;
-	if (!strcmp("#num_cores", literal))
-		return topology->core_cpus_lists;
+	if (!strcmp("#num_packages", literal)) {
+		result = topology->package_cpus_lists;
+		goto out;
+	}
+	if (!strcmp("#num_dies", literal)) {
+		result = topology->die_cpus_lists;
+		goto out;
+	}
+	if (!strcmp("#num_cores", literal)) {
+		result = topology->core_cpus_lists;
+		goto out;
+	}
 
 	pr_err("Unrecognized literal '%s'", literal);
-	return NAN;
+out:
+	pr_debug2("literal: %s = %f\n", literal, result);
+	return result;
 }