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From: Jiri Olsa <jolsa@redhat.com>
To: Ian Rogers <irogers@google.com>
Cc: 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>,
	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>,
	Stephane Eranian <eranian@google.com>,
	Sandeep Dasgupta <sdasgup@google.com>,
	linux-perf-users@vger.kernel.org
Subject: Re: [PATCH v2 2/5] perf metric: Use NAN for missing event IDs.
Date: Thu, 19 Nov 2020 20:47:07 +0100
Message-ID: <20201119194707.GK1475102@krava> (raw)
In-Reply-To: <20201118050335.2347358-3-irogers@google.com>

On Tue, Nov 17, 2020 at 09:03:32PM -0800, Ian Rogers wrote:
> 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;

hum, it's directly overwriten in the next line, no?

jirka

>  					}
>  
>  					$$ = expr_id_data__value(data);

> -- 
> 2.29.2.299.gdc1121823c-goog
> 


  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 ` [PATCH v2 2/5] perf metric: Use NAN for missing event IDs Ian Rogers
2020-11-19 19:47   ` Jiri Olsa [this message]
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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