linux-kernel - Re: [PATCH v1 7/8] perf c2c: Add option '-d llc' for sorting with LLC load

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Message-ID: <20201022084344.GA2318292@krava>
Date:   Thu, 22 Oct 2020 10:43:44 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>, Joe Mario <jmario@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Don Zickus <dzickus@...hat.com>, Al Grant <Al.Grant@....com>,
        James Clark <james.clark@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 7/8] perf c2c: Add option '-d llc' for sorting with
 LLC load

On Tue, Oct 20, 2020 at 04:08:39PM +0800, Leo Yan wrote:

SNIP

> > 
> > please update man page with this
> > 
> > >  	else {
> > >  		pr_err("failed: unknown display type: %s\n", str);
> > >  		return -1;
> > > @@ -2766,9 +2795,10 @@ static int build_cl_output(char *cl_sort, bool no_source)
> > >  	}
> > >  
> > >  	if (asprintf(&c2c.cl_output,
> > > -		"%s%s%s%s%s%s%s%s%s%s",
> > > +		"%s%s%s%s%s%s%s%s%s%s%s",
> > 
> > why is there extra '%s' when we did not add new argument.. ?
> 
> This is deliberate.  The change is as below:
> 
>         if (asprintf(&c2c.cl_output,
> -               "%s%s%s%s%s%s%s%s%s%s",
> +               "%s%s%s%s%s%s%s%s%s%s%s",
>                 c2c.use_stdio ? "cl_num_empty," : "",
> -               "percent_rmt_hitm,"
> +               c2c.display == DISPLAY_LLC ? "percent_llc_hit," :
> +                                            "percent_rmt_hitm,",
>                 "percent_lcl_hitm,"
> 
> In the old code the string "percent_rmt_hitm," is merged with later
> lines (the second string is "percent_lcl_hitm,") into single string.
> 
> In this patch, it needs to check condition c2c.display and pass
> different string ("percent_llc_hit," vs "percent_rmt_hitm,"), thus
> the string ("percent_llc_hit," or "percent_rmt_hitm,") is passed
> independently, it's _NOT_ jointed with sequnetial lines.

ah right, it's now 2 arguments instead of one

thanks,
jirka