linux-kernel - [PATCH v4 3/3] perf test: Add test for #system_tsc

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Date:   Mon, 18 Jul 2022 09:43:12 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     perry.taylor@...el.com, caleb.biggers@...el.com,
        kshipra.bopardikar@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Andi Kleen <ak@...ux.intel.com>,
        James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v4 3/3] perf test: Add test for #system_tsc_freq in metrics

The value should be non-zero on Intel while zero on everything else.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/expr.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/perf/tests/expr.c b/tools/perf/tests/expr.c
index 5c0032fe93ae..2efe9e3a63b8 100644
--- a/tools/perf/tests/expr.c
+++ b/tools/perf/tests/expr.c
@@ -1,8 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "util/debug.h"
 #include "util/expr.h"
+#include "util/header.h"
 #include "util/smt.h"
 #include "tests.h"
+#include <math.h>
 #include <stdlib.h>
 #include <string.h>
 #include <linux/zalloc.h>
@@ -69,6 +71,11 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
 	double val, num_cpus, num_cores, num_dies, num_packages;
 	int ret;
 	struct expr_parse_ctx *ctx;
+	bool is_intel = false;
+	char buf[128];
+
+	if (!get_cpuid(buf, sizeof(buf)))
+		is_intel = strstr(buf, "Intel") != NULL;
 
 	TEST_ASSERT_EQUAL("ids_union", test_ids_union(), 0);
 
@@ -175,6 +182,12 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
 	if (num_dies) // Some platforms do not have CPU die support, for example s390
 		TEST_ASSERT_VAL("#num_dies >= #num_packages", num_dies >= num_packages);
 
+	TEST_ASSERT_VAL("#system_tsc_freq", expr__parse(&val, ctx, "#system_tsc_freq") == 0);
+	if (is_intel)
+		TEST_ASSERT_VAL("#system_tsc_freq > 0", val > 0);
+	else
+		TEST_ASSERT_VAL("#system_tsc_freq == 0", fpclassify(val) == FP_ZERO);
+
 	/*
 	 * Source count returns the number of events aggregating in a leader
 	 * event including the leader. Check parsing yields an id.
-- 
2.37.0.170.g444d1eabd0-goog