linux-kernel - Re: [PATCH 5/7] perf: cache perf_event_groups

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Message-ID: <20190708165034.GI3419@hirez.programming.kicks-ass.net>
Date:   Mon, 8 Jul 2019 18:50:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 5/7] perf: cache perf_event_groups_first for cgroups

On Mon, Jul 01, 2019 at 11:59:53PM -0700, Ian Rogers wrote:
> @@ -3511,7 +3550,12 @@ static int visit_groups_merge(struct perf_event_context *ctx,
>  	min_heapify_all(&heap);
>  
>  	while (heap.num_elements > 0) {
> -		ret = func(ctx, cpuctx, heap.storage[0], data);
> +		if (is_pinned)
> +			ret = pinned_sched_in(ctx, cpuctx, heap.storage[0]);
> +		else
> +			ret = flexible_sched_in(ctx, cpuctx, heap.storage[0],
> +						data);
> +
>  		if (ret)
>  			return ret;
>  

You can actually merge those two functions; see merge_sched_in() in the
below patch:

https://lkml.kernel.org/r/20181010104559.GO5728@hirez.programming.kicks-ass.net