linux-kernel - Re: [PATCH/RFC 11/16] perf top: Implement basic parallel processing

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Date:	Mon, 14 Dec 2015 10:23:43 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH/RFC 11/16] perf top: Implement basic parallel processing

On Thu, Dec 10, 2015 at 04:53:30PM +0900, Namhyung Kim wrote:

SNIP

>  
> -	perf_top__mmap_read(top);
> -
>  	ret = -1;
> -	if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
> -							    display_thread), top)) {
> -		ui__error("Could not create display thread.\n");
> +	readers = calloc(sizeof(pthread_t), top->evlist->nr_mmaps);
> +	if (readers == NULL)
>  		goto out_delete;
> -	}
>  
> -	if (top->realtime_prio) {
> -		struct sched_param param;
> +	rargs = calloc(sizeof(*rargs), top->evlist->nr_mmaps);
> +	if (rargs == NULL)
> +		goto out_free;
>  
> -		param.sched_priority = top->realtime_prio;
> -		if (sched_setscheduler(0, SCHED_FIFO, &param)) {
> -			ui__error("Could not set realtime priority.\n");
> -			goto out_join;
> -		}
> +	hists = calloc(sizeof(*hists), top->evlist->nr_mmaps * top->evlist->nr_entries);
> +	if (hists == NULL)
> +		goto out_free;
> +
> +	for (i = 0; i < top->evlist->nr_mmaps * top->evlist->nr_entries; i++)
> +		__hists__init(&hists[i]);
> +
> +	for (i = 0; i < top->evlist->nr_mmaps; i++) {
> +		struct reader_arg *rarg = &rargs[i];
> +
> +		rarg->idx = i;
> +		rarg->top = top;
> +		rarg->hists = &hists[i * top->evlist->nr_entries];
> +
> +		perf_top__mmap_read(rarg);
>  	}
> +	collect_hists(top, hists);

hum, what's the reason for calling perf_top__mmap_read
and collect_hists in here?

also calling collect_hists on hists array pointer seems wrong

jirka
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