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From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
	Jin Yao <yao.jin@linux.intel.com>,
	John Garry <john.garry@huawei.com>, Paul Clarke <pc@us.ibm.com>,
	kajoljain <kjain@linux.ibm.com>
Cc: Stephane Eranian <eranian@google.com>,
	Sandeep Dasgupta <sdasgup@google.com>,
	linux-perf-users@vger.kernel.org, Ian Rogers <irogers@google.com>
Subject: [PATCH v2 2/5] perf metric: Use NAN for missing event IDs.
Date: Tue, 17 Nov 2020 21:03:32 -0800
Message-ID: <20201118050335.2347358-3-irogers@google.com> (raw)
In-Reply-To: <20201118050335.2347358-1-irogers@google.com>

If during computing a metric an event (id) is missing the parsing
aborts. A later patch will make it so that events that aren't used in
the output are deliberately omitted, in which case we don't want the
abort. Modify the missing ID case to report NAN for these cases.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/expr.y | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
index b2ada8f8309a..c22e3500a40f 100644
--- a/tools/perf/util/expr.y
+++ b/tools/perf/util/expr.y
@@ -1,6 +1,7 @@
 /* Simple expression parser */
 %{
 #define YYDEBUG 1
+#include <math.h>
 #include <stdio.h>
 #include "util.h"
 #include "util/debug.h"
@@ -89,8 +90,7 @@ expr:	  NUMBER
 					struct expr_id_data *data;
 
 					if (expr__resolve_id(ctx, $1, &data)) {
-						free($1);
-						YYABORT;
+						$$ = NAN;
 					}
 
 					$$ = expr_id_data__value(data);
-- 
2.29.2.299.gdc1121823c-goog


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-18  5:03 [PATCH v2 0/5] Don't compute events that won't be used in a metric Ian Rogers
2020-11-18  5:03 ` [PATCH v2 1/5] perf metric: Restructure struct expr_parse_ctx Ian Rogers
2020-11-18  5:03 ` Ian Rogers [this message]
2020-11-19 19:47   ` [PATCH v2 2/5] perf metric: Use NAN for missing event IDs Jiri Olsa
2020-11-18  5:03 ` [PATCH v2 3/5] perf metric: Rename expr__find_other Ian Rogers
2020-11-18  5:03 ` [PATCH v2 4/5] perf metric: Add utilities to work on ids map Ian Rogers
2020-11-18  5:03 ` [PATCH v2 5/5] perf metric: Don't compute unused events Ian Rogers
2020-11-19 20:59   ` Jiri Olsa
     [not found]     ` <CAP-5=fWjzwDg7SbfBq+mHqT+zDEEpei8M5AF8+Bk8sU19Ta_hg@mail.gmail.com>
2020-11-20 19:35       ` Jiri Olsa

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