linux-kernel - Re: [PATCH] perf jevents: Silence warning for ArchStd files

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Message-ID: <4f9a4f20-82ac-dd68-4aee-b560396755f2@huawei.com>
Date:   Fri, 7 May 2021 09:59:30 +0100
From:   John Garry <john.garry@...wei.com>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        "Namhyung Kim" <namhyung@...nel.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Kim Phillips <kim.phillips@....com>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf jevents: Silence warning for ArchStd files

On 06/05/2021 23:56, Ian Rogers wrote:
> json files in the level 1 directory are used for ArchStd events (see
> preprocess_arch_std_files), as such they shouldn't be warned about.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>   tools/perf/pmu-events/jevents.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
> index ed4f0bd72e5a..7422b0ea8790 100644
> --- a/tools/perf/pmu-events/jevents.c
> +++ b/tools/perf/pmu-events/jevents.c
> @@ -1123,8 +1123,10 @@ static int process_one_file(const char *fpath, const struct stat *sb,
>   			mapfile = strdup(fpath);
>   			return 0;
>   		}
> -
> -		pr_info("%s: Ignoring file %s\n", prog, fpath);
> +		if (is_json_file(bname))
> +			pr_debug("%s: ArchStd json is preprocessed %s\n", prog, fpath)
We could get more elaborate and add the same first debug print in 
process_one_file() to preprocess_arch_std_file() to give the allusion 
that they are preprocessed, and change the logic not print that for arch 
std files (in process_one_file()). But not sure it's worth it.

Or else we could also just omit any print here for archstd files here.

But I suppose what you are doing is ok...

Thanks,
John

> +		else
> +			pr_info("%s: Ignoring file %s\n", prog, fpath);
>   		return 0;
>   	}
>   
>