linux-kernel - Re: [PATCH] Fix hists related 'perf test' entries

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Date:	Wed, 2 Mar 2016 22:24:13 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
	Wang Nan <wangnan0@...wei.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix hists related 'perf test' entries

Hi Arnaldo,

On Wed, Mar 02, 2016 at 09:57:21AM -0300, Arnaldo Carvalho de Melo wrote:
> That got broken by d3a72fd8187b ("perf report: Fix indentation of
> dynamic entries in hierarchy"), by using the evlist in setup_sorting()
> without checking if it is NULL, as done in some 'perf test' entries:
> 
>   $ find tools/ -name "*.c" | xargs grep 'setup_sorting(NULL);'
>   tools/perf/tests/hists_output.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_output.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_output.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_output.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_output.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_cumulate.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_cumulate.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_cumulate.c:	setup_sorting(NULL);
>   tools/perf/tests/hists_cumulate.c:	setup_sorting(NULL);
>   $ 
> 
> Fix it.
> 
> Before:
> 
>   [root@...et ~]# perf test
>   <SNIP>
>   15: Test matching and linking multiple hists                 : FAILED!
>   16: Try 'import perf' in python, checking link problems      : Ok
>   17: Test breakpoint overflow signal handler                  : Ok
>   18: Test breakpoint overflow sampling                        : Ok
>   19: Test number of exit event of a simple workload           : Ok
>   20: Test software clock events have valid period values      : Ok
>   21: Test object code reading                                 : Ok
>   22: Test sample parsing                                      : Ok
>   23: Test using a dummy software event to keep tracking       : Ok
>   24: Test parsing with no sample_id_all bit set               : Ok
>   25: Test filtering hist entries                              : FAILED!
>   26: Test mmap thread lookup                                  : Ok
>   27: Test thread mg sharing                                   : Ok
>   28: Test output sorting of hist entries                      : FAILED!
>   29: Test cumulation of child hist entries                    : FAILED!
>   <SNIP>
> 
> After the patch the above failed tests complete successfully.

Ooops, sorry about that.  I'll run 'perf test' more often before sending
patches.

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> 
> ---
> 
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index 5888bfe9a193..4380a2858802 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -2635,25 +2635,14 @@ out:
>  	return ret;
>  }
>  
> -int setup_sorting(struct perf_evlist *evlist)
> +static void evlist__set_hists_nr_sort_keys(struct perf_evlist *evlist)
>  {
> -	int err;
> -	struct hists *hists;
>  	struct perf_evsel *evsel;
> -	struct perf_hpp_fmt *fmt;
> -
> -	err = __setup_sorting(evlist);
> -	if (err < 0)
> -		return err;
> -
> -	if (parent_pattern != default_parent_pattern) {
> -		err = sort_dimension__add("parent", evlist);
> -		if (err < 0)
> -			return err;
> -	}
>  
>  	evlist__for_each(evlist, evsel) {
> -		hists = evsel__hists(evsel);
> +		struct perf_hpp_fmt *fmt;
> +		struct hists *hists = evsel__hists(evsel);
> +
>  		hists->nr_sort_keys = perf_hpp_list.nr_sort_keys;
>  
>  		/*
> @@ -2667,6 +2656,24 @@ int setup_sorting(struct perf_evlist *evlist)
>  				hists->nr_sort_keys--;
>  		}
>  	}
> +}
> +
> +int setup_sorting(struct perf_evlist *evlist)
> +{
> +	int err;
> +
> +	err = __setup_sorting(evlist);
> +	if (err < 0)
> +		return err;
> +
> +	if (parent_pattern != default_parent_pattern) {
> +		err = sort_dimension__add("parent", evlist);
> +		if (err < 0)
> +			return err;
> +	}
> +
> +	if (evlist != NULL)
> +		evlist__set_hists_nr_sort_keys(evlist);
>  
>  	reset_dimensions();
>