linux-kernel - Re: [PATCH V5 12/17] perf evsel: expose perf_missing_features.write

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Date:   Fri, 2 Feb 2018 11:26:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     kan.liang@...el.com
Cc:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, wangnan0@...wei.com,
        jolsa@...nel.org, namhyung@...nel.org, ak@...ux.intel.com,
        yao.jin@...ux.intel.com
Subject: Re: [PATCH V5 12/17] perf evsel: expose
 perf_missing_features.write_backward

Em Thu, Jan 18, 2018 at 01:26:27PM -0800, kan.liang@...el.com escreveu:
> From: Kan Liang <kan.liang@...el.com>
> 
> perf top need it to handle overwrite fallback later.
> 
> Signed-off-by: Kan Liang <kan.liang@...el.com>
> ---
>  tools/perf/util/evsel.c | 5 +++++
>  tools/perf/util/evsel.h | 2 ++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 4eea3b4..1dd3700 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1670,6 +1670,11 @@ static bool ignore_missing_thread(struct perf_evsel *evsel,
>  	return true;
>  }
>  
> +bool is_write_backward_fail(void)
> +{
> +	return perf_missing_features.write_backward;
> +}
> +

Humm,  I think we better expose perf_missing_features, i.e. tools using

	if (perf_missing_features.write_backward)

looks more clear than:

	if (is_write_backward_fail())

This is minor, so I'm doing this myself, please holler if you disagree.

- Arnaldo

>  int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
>  		     struct thread_map *threads)
>  {
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 846e416..1f46728 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -448,4 +448,6 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
>  
>  struct perf_env *perf_evsel__env(struct perf_evsel *evsel);
>  
> +bool is_write_backward_fail(void);
> +
>  #endif /* __PERF_EVSEL_H */
> -- 
> 2.5.5