linux-kernel - Re: [RFC PATCH v2 1/2] perf tools: Set evsel->system_wide field for global system wide recording

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Date:	Mon, 26 Oct 2015 14:24:15 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Wang Nan <wangnan0@...wei.com>, acme@...nel.org, ast@...mgrid.com
Cc:	linux-kernel@...r.kernel.org, pi3orama@....com, lizefan@...wei.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC PATCH v2 1/2] perf tools: Set evsel->system_wide field for
 global system wide recording

On 26/10/15 13:41, Wang Nan wrote:
> evsel->system_wide is introduced by commit bf8e8f4b832972c76d64ab2e2837
> (perf evlist: Add 'system_wide' option), which is used for mixing evsels
> that aren't system-wide with ones that are [1]. However, for global
> system wide recording (perf record -a ...), evsel->system_wide is set
> to false, which is confusion.
> 
> This patch set evsel->system_wide to true if the target.system_wide is
> set, which makes evsel->system_wide a reliable way to describe whether
> itself is system_wide or not.
> 
> [1] http://lkml.kernel.org/r/562DF19B.2080608@intel.com
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Alexei Starovoitov <ast@...mgrid.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Li Zefan <lizefan@...wei.com>
> Cc: pi3orama@....com
> Link: http://lkml.kernel.org/n/ebpf-qm3gtwidc1o5ktjd9tgjex25@git.kernel.org
> ---
>  tools/perf/util/evsel.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 3ac4ee9c..36ecf0e 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -734,6 +734,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
>  	int track = evsel->tracking;
>  	bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
>  
> +	evsel->system_wide = opts->target.system_wide;

Well that breaks the way evsel->system_wide is used i.e. it is a parameter
to the evsel and here you just overwrote it.

>  	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
>  	attr->inherit	    = !opts->no_inherit;
>  
> 


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