linux-kernel - Re: [PATCH] perf script: Fix error when printing 'weight' field

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Date:   Mon, 21 Feb 2022 20:46:32 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     German Gomez <german.gomez@....com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] perf script: Fix error when printing 'weight' field

On Mon, Feb 21, 2022 at 05:17:06PM +0000, German Gomez wrote:
> In SPE traces the 'weight' field can't be printed in perf-script because
> the 'dummy:u' event doesn't have the WEIGHT attribute set.
> 
> Use evsel__do_check_stype(..) to check this field, as it's done with
> other fields such as "phys_addr".
> 
> Before:
> 
> $ perf record -e arm_spe_0// -- sleep 1
> $ perf script -F event,ip,weight
> Samples for 'dummy:u' event do not have WEIGHT attribute set. Cannot print 'weight' field.
> 
> After:
> 
> $ perf script -F event,ip,weight
>    l1d-access:               12 ffffaf629d4cb320
>    tlb-access:               12 ffffaf629d4cb320
>        memory:               12 ffffaf629d4cb320
> 
> Fixes: b0fde9c6e291 ("perf arm-spe: Add SPE total latency as PERF_SAMPLE_WEIGHT")
> Signed-off-by: German Gomez <german.gomez@....com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/builtin-script.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 9e032343f..6ce581067 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -463,7 +463,7 @@ static int evsel__check_attr(struct evsel *evsel, struct perf_session *session)
>  		return -EINVAL;
>  
>  	if (PRINT_FIELD(WEIGHT) &&
> -	    evsel__check_stype(evsel, PERF_SAMPLE_WEIGHT_TYPE, "WEIGHT", PERF_OUTPUT_WEIGHT))
> +	    evsel__do_check_stype(evsel, PERF_SAMPLE_WEIGHT_TYPE, "WEIGHT", PERF_OUTPUT_WEIGHT, allow_user_set))
>  		return -EINVAL;
>  
>  	if (PRINT_FIELD(SYM) &&
> -- 
> 2.25.1
>