linux-kernel - Re: [PATCH v12 2/3]: perf record: enable asynchronous trace writing

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Message-ID: <20181011134544.GA29634@krava>
Date:   Thu, 11 Oct 2018 15:45:44 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 2/3]: perf record: enable asynchronous trace writing

On Tue, Oct 09, 2018 at 11:58:53AM +0300, Alexey Budankov wrote:

SNIP

> @@ -329,7 +469,7 @@ static int record__mmap_evlist(struct record *rec,
>  
>  	if (perf_evlist__mmap_ex(evlist, opts->mmap_pages,
>  				 opts->auxtrace_mmap_pages,
> -				 opts->auxtrace_snapshot_mode) < 0) {
> +				 opts->auxtrace_snapshot_mode, opts->nr_cblocks) < 0) {
>  		if (errno == EPERM) {
>  			pr_err("Permission error mapping pages.\n"
>  			       "Consider increasing "
> @@ -513,6 +653,29 @@ static struct perf_event_header finished_round_event = {
>  	.type = PERF_RECORD_FINISHED_ROUND,
>  };
>  
> +#ifdef HAVE_AIO_SUPPORT
> +static void record__mmap_read_sync(struct record *rec)
> +{
> +	int i;
> +	struct perf_evlist *evlist = rec->evlist;
> +	struct perf_mmap *maps = evlist->mmap;
> +
> +	if (!rec->opts.nr_cblocks)
> +		return;
> +
> +	for (i = 0; i < evlist->nr_mmaps; i++) {
> +		struct perf_mmap *map = &maps[i];
> +
> +		if (map->base)
> +			record__aio_sync(map);
> +	}
> +}
> +#else
> +static void record__mmap_read_sync(struct record *rec __maybe_unused)
> +{
> +}
> +#endif

please move this up so we have just one  'ifdef HAVE_AIO_SUPPORT' block

and change the name to record__aio_mmap_read_sync, so it's obvious it's
aio related, like the rest of the functions you added

thanks,
jirka