linux-kernel - Re: [PATCH v2 11/16] perf parse-events: Improve error message for bad numbers

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Date: Fri, 26 Apr 2024 22:36:31 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	James Clark <james.clark@....com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	Atish Patra <atishp@...osinc.com>, linux-riscv@...ts.infradead.org,
	Beeman Strong <beeman@...osinc.com>
Subject: Re: [PATCH v2 11/16] perf parse-events: Improve error message for
 bad numbers

On Fri, Apr 26, 2024 at 10:36:02PM -0300, Arnaldo Carvalho de Melo wrote:
> On Mon, Apr 15, 2024 at 11:15:27PM -0700, Ian Rogers wrote:
> > Use the error handler from the parse_state to give a more informative
> > error message.
> > 
> > Before:
> > ```
> > $ perf stat -e 'cycles/period=99999999999999999999/' true
> > event syntax error: 'cycles/period=99999999999999999999/'
> >                                   \___ parser error
> > Run 'perf list' for a list of valid events
> > 
> >  Usage: perf stat [<options>] [<command>]
> > 
> >     -e, --event <event>   event selector. use 'perf list' to list available events
> > ```
> > 
> > After:
> > ```
> > $ perf stat -e 'cycles/period=99999999999999999999/' true
> > event syntax error: 'cycles/period=99999999999999999999/'
> >                                   \___ parser error
> > 
> 
> This ended up in perf-tools-next, will have to look at what this problem
> is:
> 
>    9    11.46 amazonlinux:2                 : FAIL gcc version 7.3.1 20180712 (Red Hat 7.3.1-17) (GCC) 
>      yy_size_t parse_events_get_leng (yyscan_t yyscanner );
>                ^~~~~~~~~~~~~~~~~~~~~
>     util/parse-events.l:22:5: note: previous declaration of 'parse_events_get_leng' was here
>      int parse_events_get_leng(yyscan_t yyscanner);
>          ^~~~~~~~~~~~~~~~~~~~~
>      yy_size_t parse_events_get_leng  (yyscan_t yyscanner)
>                ^~~~~~~~~~~~~~~~~~~~~
>     util/parse-events.l:22:5: note: previous declaration of 'parse_events_get_leng' was here
>      int parse_events_get_leng(yyscan_t yyscanner);
>          ^~~~~~~~~~~~~~~~~~~~~
>     make[3]: *** [util] Error 2
> 
> 
> Unsure if this will appear on the radar on other distros, maybe this is
> just something that pops up with older distros...
> 
> Ran out of time today...

Context:

perfbuilder@...ber:~$ export BUILD_TARBALL=http://192.168.86.42/perf/perf-6.9.0-rc5.tar.xz
perfbuilder@...ber:~$ time dm
   1   102.33 almalinux:8                   : Ok   gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-20) , clang version 16.0.6 (Red Hat 16.0.6-2.module_el8.9.0+3621+df7f7146) flex 2.6.1
   2   102.44 almalinux:9                   : Ok   gcc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2) , clang version 16.0.6 (Red Hat 16.0.6-1.el9) flex 2.6.4
   3   124.34 alpine:3.15                   : Ok   gcc (Alpine 10.3.1_git20211027) 10.3.1 20211027 , Alpine clang version 12.0.1 flex 2.6.4
   4   109.42 alpine:3.16                   : Ok   gcc (Alpine 11.2.1_git20220219) 11.2.1 20220219 , Alpine clang version 13.0.1 flex 2.6.4
   5    90.08 alpine:3.17                   : Ok   gcc (Alpine 12.2.1_git20220924-r4) 12.2.1 20220924 , Alpine clang version 15.0.7 flex 2.6.4
   6    84.85 alpine:3.18                   : Ok   gcc (Alpine 12.2.1_git20220924-r10) 12.2.1 20220924 , Alpine clang version 16.0.6 flex 2.6.4
   7    94.18 alpine:3.19                   : Ok   gcc (Alpine 13.2.1_git20231014) 13.2.1 20231014 , Alpine clang version 17.0.5 flex 2.6.4
   8    95.45 alpine:edge                   : Ok   gcc (Alpine 13.2.1_git20240309) 13.2.1 20240309 , Alpine clang version 17.0.6 flex 2.6.4
   9    11.46 amazonlinux:2                 : FAIL gcc version 7.3.1 20180712 (Red Hat 7.3.1-17) (GCC) 
     yy_size_t parse_events_get_leng (yyscan_t yyscanner );
               ^~~~~~~~~~~~~~~~~~~~~
    util/parse-events.l:22:5: note: previous declaration of 'parse_events_get_leng' was here
     int parse_events_get_leng(yyscan_t yyscanner);
         ^~~~~~~~~~~~~~~~~~~~~
     yy_size_t parse_events_get_leng  (yyscan_t yyscanner)
               ^~~~~~~~~~~~~~~~~~~~~
    util/parse-events.l:22:5: note: previous declaration of 'parse_events_get_leng' was here
     int parse_events_get_leng(yyscan_t yyscanner);
         ^~~~~~~~~~~~~~~~~~~~~
    make[3]: *** [util] Error 2
  10    88.41 amazonlinux:2023              : Ok   gcc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2) , clang version 15.0.7 (Amazon Linux 15.0.7-3.amzn2023.0.1) flex 2.6.4
  11    89.72 amazonlinux:devel             : Ok   gcc (GCC) 11.3.1 20221121 (Red Hat 11.3.1-4) , clang version 15.0.6 (Amazon Linux 15.0.6-3.amzn2023.0.2) flex 2.6.4
  12   115.65 archlinux:base                : Ok   gcc (GCC) 13.2.1 20230801 , clang version 17.0.6 flex 2.6.4
  13    93.87 centos:stream                 : Ok   gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-21) , clang version 17.0.6 (Red Hat 17.0.6-1.module_el8+767+9fa966b8) flex 2.6.1