linux-kernel - Re: [PATCH] perf c2c: Display proper cpu count in nodes column

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Date:   Tue, 20 Aug 2019 11:16:52 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Joe Mario <jmario@...hat.com>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>
Subject: Re: [PATCH] perf c2c: Display proper cpu count in nodes column

Em Tue, Aug 20, 2019 at 04:02:19PM +0200, Jiri Olsa escreveu:
> There's wrong bitmap considered when checking
> for cpu count of specific node.
> 
> We do the needed computation for 'set' variable,
> but at the end we use the 'c2c_he->cpuset' weight,
> which shows misleading numbers.
> 
> Reported-by: Joe Mario <jmario@...hat.com>

You forgot to add this:

Fixes: 1e181b92a2da ("perf c2c report: Add 'node' sort key")

Can you please confirm that that is the cset being fixed? This helps
with backporters, stable@, etc.

- Arnaldo


> Link: https://lkml.kernel.org/n/tip-9wvrv74n7d4nbgztr74isv5j@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/builtin-c2c.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index f0aae6e13a33..9240c6bf70f5 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -1106,7 +1106,7 @@ node_entry(struct perf_hpp_fmt *fmt __maybe_unused, struct perf_hpp *hpp,
>  			break;
>  		case 1:
>  		{
> -			int num = bitmap_weight(c2c_he->cpuset, c2c.cpus_cnt);
> +			int num = bitmap_weight(set, c2c.cpus_cnt);
>  			struct c2c_stats *stats = &c2c_he->node_stats[node];
>  
>  			ret = scnprintf(hpp->buf, hpp->size, "%2d{%2d ", node, num);
> -- 
> 2.21.0

-- 

- Arnaldo