From 3e21a28a01e227726456a51933ed004c2df31850 Mon Sep 17 00:00:00 2001
From: Ian Rogers <irogers@google.com>
Date: Wed, 10 Jun 2020 16:58:22 -0700
Subject: perf expr: Add d_ratio operation

d_ratio avoids division by 0 yielding infinity, such as when a counter
doesn't get scheduled. An example usage is:

  {
      "BriefDescription": "DCache L1 misses",
      "MetricExpr": "d_ratio(MEM_LOAD_RETIRED.L1_MISS, MEM_LOAD_RETIRED.L1_HIT + MEM_LOAD_RETIRED.L1_MISS + MEM_LOAD_RETIRED.FB_HIT)",
      "MetricGroup": "DCache;DCache_L1",
      "MetricName": "DCache_L1_Miss",
      "ScaleUnit": "100%",
  }

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200610235823.52557-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/tests/expr.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'tools/perf/tests')

diff --git a/tools/perf/tests/expr.c b/tools/perf/tests/expr.c
index 1cb02ca2b15f..c4877b36ab58 100644
--- a/tools/perf/tests/expr.c
+++ b/tools/perf/tests/expr.c
@@ -39,6 +39,8 @@ int test__expr(struct test *t __maybe_unused, int subtest __maybe_unused)
 	ret |= test(&ctx, "1+1 if 3*4 else 0", 2);
 	ret |= test(&ctx, "1.1 + 2.1", 3.2);
 	ret |= test(&ctx, ".1 + 2.", 2.1);
+	ret |= test(&ctx, "d_ratio(1, 2)", 0.5);
+	ret |= test(&ctx, "d_ratio(2.5, 0)", 0);
 
 	if (ret)
 		return ret;
-- 
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