linux-kernel - Re: [PATCH v5 10/13] perf stat: Use affinity for opening events

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Date:   Mon, 11 Nov 2019 14:30:27 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     jolsa@...nel.org, acme@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v5 10/13] perf stat: Use affinity for opening events

On Thu, Nov 07, 2019 at 10:16:43AM -0800, Andi Kleen wrote:

SNIP

> +				 * Don't close here because we're in the wrong affinity.
> +				 */
> +				if ((errno == EINVAL || errno == EBADF) &&
> +				    counter->leader != counter &&
> +				    counter->weak_group) {
> +					perf_evlist__reset_weak_group(evsel_list, counter, false);
> +					assert(counter->reset_group);
> +					second_pass = true;
> +					continue;
> +				}
> +
> +				switch (stat_handle_error(counter)) {
> +				case COUNTER_FATAL:
> +					return -1;
> +				case COUNTER_RETRY:
> +					goto try_again;
> +				case COUNTER_SKIP:
> +					continue;
> +				default:
> +					break;
> +				}
> +
>  			}
> +			counter->supported = true;
> +		}
> +	}
>  
> -			switch (stat_handle_error(counter)) {
> -			case COUNTER_FATAL:
> -				return -1;
> -			case COUNTER_RETRY:
> -				goto try_again;
> -			case COUNTER_SKIP:
> -				continue;
> -			default:
> -				break;
> +	if (second_pass) {
> +		/*
> +		 * Now redo all the weak group after closing them,
> +		 * and also close errored counters.
> +		 */
> +
> +		evlist__cpu_iter_start(evsel_list);
> +		evlist__for_each_cpu (evsel_list, i, cpu) {

no need for evlist__cpu_iter_start call in here?

jirka

> +			affinity__set(&affinity, cpu);
> +			/* First close errored or weak retry */
> +			evlist__for_each_entry(evsel_list, counter) {
> +				if (!counter->reset_group && !counter->errored)
> +					continue;
> +				if (evsel__cpu_iter_skip_no_inc(counter, cpu))
> +					continue;
> +				perf_evsel__close_cpu(&counter->core, counter->cpu_iter);
>  			}
> +			/* Now reopen weak */
> +			evlist__for_each_entry(evsel_list, counter) {
> +				if (!counter->reset_group && !counter->errored)

SNIP