linux-kernel - Re: [PATCH v1 8/9] perf stat: Remove --per-thread pid/tid limitation

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Date:   Tue, 21 Nov 2017 16:18:23 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v1 8/9] perf stat: Remove --per-thread pid/tid limitation

On Mon, Nov 20, 2017 at 10:43:43PM +0800, Jin Yao wrote:

SNIP

> diff --git a/tools/perf/util/target.h b/tools/perf/util/target.h
> index 446aa7a..6ef01a8 100644
> --- a/tools/perf/util/target.h
> +++ b/tools/perf/util/target.h
> @@ -64,6 +64,11 @@ static inline bool target__none(struct target *target)
>  	return !target__has_task(target) && !target__has_cpu(target);
>  }
>  
> +static inline bool target__has_per_thread(struct target *target)
> +{
> +	return target->system_wide && target->per_thread;
> +}

this is confusing.. has_per_thread depends on system_wide?

> +
>  static inline bool target__uses_dummy_map(struct target *target)
>  {
>  	bool use_dummy = false;
> @@ -73,6 +78,8 @@ static inline bool target__uses_dummy_map(struct target *target)
>  	else if (target__has_task(target) ||
>  	         (!target__has_cpu(target) && !target->uses_mmap))
>  		use_dummy = true;
> +	else if (target__has_per_thread(target))
> +		use_dummy = true;

why do we need dummy_map for this? please comment

thanks,
jirka