linux-kernel - Re: [PATCH v11 2/3]: perf record: enable asynchronous trace writing

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Date:   Mon, 8 Oct 2018 15:26:51 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        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 v11 2/3]: perf record: enable asynchronous trace writing

Hi,

On 08.10.2018 13:58, Jiri Olsa wrote:
> On Mon, Oct 08, 2018 at 09:17:11AM +0300, Alexey Budankov wrote:
>>  
<SNIP>
>> +#ifdef HAVE_AIO_SUPPORT
>> +	off = lseek(trace_fd, 0, SEEK_CUR);
>> +#endif
>>  	for (i = 0; i < evlist->nr_mmaps; i++) {
>>  		struct perf_mmap *map = &maps[i];
>>  
>>  		if (map->base) {
>> -			if (perf_mmap__push(map, rec, record__pushfn) != 0) {
>> -				rc = -1;
>> -				goto out;
>> +#ifdef HAVE_AIO_SUPPORT
>> +			if (!rec->opts.nr_cblocks) {
>> +#endif
> 
> maybe it'd be less confusing having something like 
>   rec->opts.aio.enabled
> 
> or aio__is_enabled() global with the dummy counterpart

Makes sense. Will implement __is_enabled() function.

Thanks,
Alexey

> 
> jirka
>