netdev - Re: [PATCH 5/7] perf metricgroup: Remove duped metric group events

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Date:   Wed, 20 May 2020 15:48:47 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>,
        Andrii Nakryiko <andriin@...com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        Paul Clarke <pc@...ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 5/7] perf metricgroup: Remove duped metric group events

On Wed, May 20, 2020 at 12:28:12AM -0700, Ian Rogers wrote:

SNIP

>  
> @@ -157,7 +183,7 @@ static int metricgroup__setup_events(struct list_head *groups,
>  	int i = 0;
>  	int ret = 0;
>  	struct egroup *eg;
> -	struct evsel *evsel;
> +	struct evsel *evsel, *tmp;
>  	unsigned long *evlist_used;
>  
>  	evlist_used = bitmap_alloc(perf_evlist->core.nr_entries);
> @@ -173,7 +199,8 @@ static int metricgroup__setup_events(struct list_head *groups,
>  			ret = -ENOMEM;
>  			break;
>  		}
> -		evsel = find_evsel_group(perf_evlist, &eg->pctx, metric_events,
> +		evsel = find_evsel_group(perf_evlist, &eg->pctx,
> +					eg->has_constraint, metric_events,
>  					evlist_used);
>  		if (!evsel) {
>  			pr_debug("Cannot resolve %s: %s\n",
> @@ -200,6 +227,12 @@ static int metricgroup__setup_events(struct list_head *groups,
>  		list_add(&expr->nd, &me->head);
>  	}
>  
> +	evlist__for_each_entry_safe(perf_evlist, tmp, evsel) {
> +		if (!test_bit(evsel->idx, evlist_used)) {
> +			evlist__remove(perf_evlist, evsel);
> +			evsel__delete(evsel);
> +		}

is the groupping still enabled when we merge groups? could part
of the metric (events) be now computed in different groups?

I was wondering if we could merge all the hasmaps into single
one before the parse the evlist.. this way we won't need removing
later.. but I did not thought this through completely, so it
might not work at some point

jirka