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From: Jiri Olsa <jolsa@redhat.com>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Clark Williams <williams@redhat.com>,
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	Jiri Olsa <jolsa@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	David Ahern <dsahern@gmail.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [PATCH 05/12] perf pmu: Fix pmu events parsing rule
Date: Thu, 3 May 2018 13:47:38 +0200	[thread overview]
Message-ID: <20180503114738.GB14776@krava> (raw)
In-Reply-To: <0c33d3f9-4b76-c94c-7306-e93e8cd8d4aa@intel.com>

On Thu, May 03, 2018 at 02:38:15PM +0300, Adrian Hunter wrote:
> On 03/05/18 13:37, Jiri Olsa wrote:
> > On Thu, May 03, 2018 at 11:25:16AM +0300, Adrian Hunter wrote:
> >> Hi
> >>
> >> This breaks Intel PT i.e.
> >>
> >> $ perf record -e intel_pt//u uname
> >> event syntax error: 'intel_pt//u'
> >>                              \___ parser error
> >> Run 'perf list' for a list of valid events
> >>
> >>  Usage: perf record [<options>] [<command>]
> >>     or: perf record [<options>] -- <command> [<options>]
> >>
> >>     -e, --event <event>   event selector. use 'perf list' to list available events
> >>
> >> See below for cause.
> >>
> >> On 25/04/18 19:00, Arnaldo Carvalho de Melo wrote:
> >>> From: Jiri Olsa <jolsa@kernel.org>
> >>>
> >>> Currently all the event parsing fails end up in the event_pmu rule, and
> >>> display misleading help like:
> >>>
> >>>   $ perf stat -e inst kill
> >>>   event syntax error: 'inst'
> >>>                        \___ Cannot find PMU `inst'. Missing kernel support?
> >>>   ...
> >>>
> >>> The reason is that the event_pmu is too strong and match also single
> >>> string. Changing it to force the '/' separators to be part of the rule,
> >>> and getting the proper error now:
> >>>
> >>>   $ perf stat -e inst kill
> >>>   event syntax error: 'inst'
> >>>                        \___ parser error
> >>>   Run 'perf list' for a list of valid events
> >>>   ...
> >>>
> >>> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> >>> Reported-by: Ingo Molnar <mingo@kernel.org>
> >>> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> >>> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> >>> Cc: David Ahern <dsahern@gmail.com>
> >>> Cc: Namhyung Kim <namhyung@kernel.org>
> >>> Cc: Peter Zijlstra <peterz@infradead.org>
> >>> Link: http://lkml.kernel.org/r/20180423090823.32309-5-jolsa@kernel.org
> >>> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> >>> ---
> >>>  tools/perf/util/parse-events.y | 8 ++++----
> >>>  1 file changed, 4 insertions(+), 4 deletions(-)
> >>>
> >>> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> >>> index 7afeb80cc39e..d14464c42714 100644
> >>> --- a/tools/perf/util/parse-events.y
> >>> +++ b/tools/perf/util/parse-events.y
> >>> @@ -224,15 +224,15 @@ event_def: event_pmu |
> >>>  	   event_bpf_file
> >>>  
> >>>  event_pmu:
> >>> -PE_NAME opt_event_config
> >>> +PE_NAME '/' event_config '/'
> >>
> >> These are not equivalent because opt_event_config allows '//'
> >> but event_config cannot be an empty string.
> > 
> > yep, overlooked this one, how about patch below
> 
> Seems to work but gives build warnings:
> 
> util/parse-events.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
> util/parse-events.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr]

hm, I wonder why my bison was silent.. there's conflict
with opt_event_config reduction to empty, I'll resend

thanks,
jirka

  reply	other threads:[~2018-05-03 11:47 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25 15:59 [GIT PULL 00/12] perf/urgent fixes Arnaldo Carvalho de Melo
2018-04-25 15:59 ` [PATCH 01/12] perf machine: Set main kernel end address properly Arnaldo Carvalho de Melo
2018-04-25 15:59 ` [PATCH 02/12] perf list: Remove s390 specific strcmp_cpuid_cmp function Arnaldo Carvalho de Melo
2018-04-25 15:59 ` [PATCH 03/12] perf test: Adapt test case record+probe_libc_inet_pton.sh for s390 Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 04/12] perf stat: Keep the / modifier separator in fallback Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 05/12] perf pmu: Fix pmu events parsing rule Arnaldo Carvalho de Melo
2018-05-03  8:25   ` Adrian Hunter
2018-05-03 10:37     ` Jiri Olsa
2018-05-03 11:38       ` Adrian Hunter
2018-05-03 11:47         ` Jiri Olsa [this message]
2018-05-04 16:02         ` Jiri Olsa
2018-05-06  3:43           ` Andi Kleen
2018-05-06 14:28             ` [PATCH] perf tools: Fix parser for empty pmu terms case Jiri Olsa
2018-05-06 16:34               ` Liang, Kan
2018-05-07  7:21               ` Adrian Hunter
2018-05-07  8:12                 ` Jiri Olsa
2018-05-07 15:04                   ` Arnaldo Carvalho de Melo
2018-05-07 18:37             ` [PATCH 05/12] perf pmu: Fix pmu events parsing rule Arnaldo Carvalho de Melo
2018-05-07 19:16               ` Jiri Olsa
2018-05-07 19:26                 ` Arnaldo Carvalho de Melo
2018-05-07 19:24               ` Arnaldo Carvalho de Melo
2018-05-07 19:42                 ` Jiri Olsa
2018-04-25 16:00 ` [PATCH 06/12] perf evsel: Disable write_backward for leader sampling group events Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 07/12] perf mem: Document incorrect and missing options Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 08/12] perf record: Fix s390 undefined record__auxtrace_init() return value Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 09/12] perf pmu: Fix core PMU alias list for X86 platform Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 10/12] perf stat: Print out hint for mixed PMU group error Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 11/12] perf evsel: Only fall back group read for leader Arnaldo Carvalho de Melo
2018-04-25 16:00 ` [PATCH 12/12] perf stat: Fix duplicate PMU name for interval print Arnaldo Carvalho de Melo
2018-04-26  5:33 ` [GIT PULL 00/12] perf/urgent fixes Ingo Molnar

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