linux-kernel - Re: [PATCH v7 10/12] perf stat: Use affinity for reading

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Date:   Wed, 20 Nov 2019 16:12:23 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v7 10/12] perf stat: Use affinity for reading

On Fri, Nov 15, 2019 at 09:52:27PM -0800, Andi Kleen wrote:

SNIP

> +					perf_evsel__name(counter),
> +					cpu,
> +					count->val, count->ena, count->run);
> +		}
>  	}
>  
>  	return 0;
> @@ -325,15 +318,36 @@ static int read_counter(struct evsel *counter, struct timespec *rs)
>  static void read_counters(struct timespec *rs)
>  {
>  	struct evsel *counter;
> -	int ret;
> +	struct affinity affinity;
> +	int i, ncpus, cpu;
> +
> +	if (affinity__setup(&affinity) < 0)
> +		return;
> +
> +	ncpus = evsel_list->core.all_cpus->nr;

please use perf_cpu_map__nr

> +	if (!target__has_cpu(&target) || target__has_per_thread(&target))
> +		ncpus = 1;
> +	evlist__for_each_cpu (evsel_list, i, cpu) {
> +		if (i >= ncpus)
> +			break;
> +		affinity__set(&affinity, cpu);
> +
> +		evlist__for_each_entry(evsel_list, counter) {
> +			if (evsel__cpu_iter_skip(counter, cpu))
> +				continue;
> +			if (!counter->err)
> +				counter->err = read_counter_cpu(counter, rs,
> +								counter->cpu_iter - 1);

please use { } to enclose multiline if legs

thanks,
jirka