linux-kernel - Re: [PATCH] perf c2c: Fix report with offline cpus

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Date:   Thu, 22 Aug 2019 12:10:26 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     acme@...nel.org, linux-kernel@...r.kernel.org,
        Nageswara R Sastry <nasastry@...ibm.com>
Subject: Re: [PATCH] perf c2c: Fix report with offline cpus

On Thu, Aug 22, 2019 at 02:20:45PM +0530, Ravi Bangoria wrote:
> If c2c is recorded on a machine where any cpus are offline,
> 'perf c2c report' throws an error "node/cpu topology bugFailed
> setup nodes". It fails because while preparing node-cpu mapping
> we don't consider offline cpus.
> 
> Fixes: 1e181b92a2da ("perf c2c report: Add 'node' sort key")
> Reported-by: Nageswara R Sastry <nasastry@...ibm.com>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
>  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 9e6cc86..fc68a94 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -2027,7 +2027,7 @@ static int setup_nodes(struct perf_session *session)
>  		c2c.node_info = 2;
>  
>  	c2c.nodes_cnt = session->header.env.nr_numa_nodes;
> -	c2c.cpus_cnt  = session->header.env.nr_cpus_online;
> +	c2c.cpus_cnt  = session->header.env.nr_cpus_avail;
>  
>  	n = session->header.env.numa_nodes;
>  	if (!n)
> -- 
> 1.8.3.1
>