linux-kernel - Re: [PATCH] perf list: Fix the --no-desc option

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Date: Sat, 11 May 2024 13:00:19 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>, leit@...a.com,
	"open list:PERFORMANCE EVENTS SUBSYSTEM" <linux-perf-users@...r.kernel.org>,
	"open list:PERFORMANCE EVENTS SUBSYSTEM" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf list: Fix the --no-desc option

On Wed, May 08, 2024 at 06:35:17AM -0700, Breno Leitao wrote:
> Currently, the --no-desc option in perf list isn't functioning as
> intended.
> 
> This issue arises from the overwriting of struct option->desc with the
> opposite value of struct option->long_desc. Consequently, whatever
> parse_options() returns at struct option->desc gets overridden later,
> rendering the --desc or --no-desc arguments ineffective.
> 
> To resolve this, set ->desc as true by default and allow parse_options()
> to adjust it accordingly. This adjustment will fix the --no-desc
> option while preserving the functionality of the other parameters.


Thanks, applied to perf-tools-next, and added this:

    Committer testing:
    
    Before:
    
      $ perf list --no-desc
      <SNIP>
      cache:
        longest_lat_cache.miss
             [Counts the number of cacheable memory requests that miss in the LLC. Counts on a per core basis. Unit: cpu_atom]
        longest_lat_cache.reference
             [Counts the number of cacheable memory requests that access the LLC. Counts on a per core basis. Unit: cpu_atom]
        mem_bound_stalls.ifetch
             [Counts the number of cycles the core is stalled due to an instruction cache or TLB miss which hit in the L2,LLC,DRAM or MMIO (Non-DRAM). Unit: cpu_atom]
        mem_bound_stalls.ifetch_dram_hit
             [Counts the number of cycles the core is stalled due to an instruction cache or TLB miss which hit in DRAM or MMIO (Non-DRAM). Unit: cpu_atom]
        mem_bound_stalls.ifetch_l2_hit
             [Counts the number of cycles the core is stalled due to an instruction cache or TLB miss which hit in the L2 cache. Unit: cpu_atom]
        mem_bound_stalls.ifetch_llc_hit
             [Counts the number of cycles the core is stalled due to an instruction cache or TLB miss which hit in the LLC or other core with HITE/F/M. Unit: cpu_atom]
      <SNIP>
    
    After:
    
      $ perf list --no-desc
      <SNIP>
        cache:
        longest_lat_cache.miss
        longest_lat_cache.reference
        mem_bound_stalls.ifetch
        mem_bound_stalls.ifetch_dram_hit
        mem_bound_stalls.ifetch_l2_hit
        mem_bound_stalls.ifetch_llc_hit
      <SNIP>
    
    Signed-off-by: Breno Leitao <leitao@...ian.org>
    Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>

- Arnaldo
 
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> ---
>  tools/perf/builtin-list.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> index 02bf608d585e..58589f67e800 100644
> --- a/tools/perf/builtin-list.c
> +++ b/tools/perf/builtin-list.c
> @@ -491,6 +491,7 @@ int cmd_list(int argc, const char **argv)
>  	int i, ret = 0;
>  	struct print_state default_ps = {
>  		.fp = stdout,
> +		.desc = true,
>  	};
>  	struct print_state json_ps = {
>  		.fp = stdout,
> @@ -563,7 +564,6 @@ int cmd_list(int argc, const char **argv)
>  		};
>  		ps = &json_ps;
>  	} else {
> -		default_ps.desc = !default_ps.long_desc;
>  		default_ps.last_topic = strdup("");
>  		assert(default_ps.last_topic);
>  		default_ps.visited_metrics = strlist__new(NULL, NULL);
> -- 
> 2.43.0