linux-kernel - Re: [PATCH RFC v5 01/13] perf jevents: Add support for an extra directory level

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Message-ID: <61c23ae8-73d4-4616-38f5-f81dafbf5851@linux.ibm.com>
Date:   Fri, 13 Nov 2020 14:18:19 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     John Garry <john.garry@...wei.com>, acme@...nel.org,
        will@...nel.org, mark.rutland@....com, jolsa@...hat.com,
        irogers@...gle.com, leo.yan@...aro.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org, mathieu.poirier@...aro.org
Cc:     linuxarm@...wei.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, qiangqing.zhang@....com,
        zhangshaokun@...ilicon.com, linux-imx@....com
Subject: Re: [PATCH RFC v5 01/13] perf jevents: Add support for an extra
 directory level



On 11/6/20 6:05 PM, John Garry wrote:
> Currently only upto a level 2 directory is supported, in form
> vendor/platform.

Hi John,
    Just want to check in case of sub directories,
Will it be good add on/feasible to be able to include events of particular sub-directory for a
platform? Otherwise with this patch in the end all event will be part of
same pmu_event structure. So what is the purpose of sub directories? Let me know if I am missing something.

Thanks,
Kajol Jain
> 
> Add support for a further level, to support vendor/platform
> sub-directories in future.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  tools/perf/pmu-events/jevents.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
> index 72cfa3b5046d..9022216b1253 100644
> --- a/tools/perf/pmu-events/jevents.c
> +++ b/tools/perf/pmu-events/jevents.c
> @@ -978,15 +978,20 @@ static int process_one_file(const char *fpath, const struct stat *sb,
>  	int level   = ftwbuf->level;
>  	int err = 0;
>  
> -	if (level == 2 && is_dir) {
> +	if (level >= 2 && is_dir) {
> +		int count = 0;
>  		/*
>  		 * For level 2 directory, bname will include parent name,
>  		 * like vendor/platform. So search back from platform dir
>  		 * to find this.
> +		 * Something similar for level 3 directory, but we're a PMU
> +		 * category folder, like vendor/platform/cpu.
>  		 */
>  		bname = (char *) fpath + ftwbuf->base - 2;
>  		for (;;) {
>  			if (*bname == '/')
> +				count++;
> +			if (count == level - 1)
>  				break;
>  			bname--;
>  		}
> @@ -999,13 +1004,13 @@ static int process_one_file(const char *fpath, const struct stat *sb,
>  		 level, sb->st_size, bname, fpath);
>  
>  	/* base dir or too deep */
> -	if (level == 0 || level > 3)
> +	if (level == 0 || level > 4)
>  		return 0;
>  
>  
>  	/* model directory, reset topic */
>  	if ((level == 1 && is_dir && is_leaf_dir(fpath)) ||
> -	    (level == 2 && is_dir)) {
> +	    (level >= 2 && is_dir && is_leaf_dir(fpath))) {
>  		if (close_table)
>  			print_events_table_suffix(eventsfp);
>  
>