Re: [PATCH v12 3/3]: perf record: extend trace writing to multi AIO

[Alexey Budankov]

Hi,
On 11.10.2018 16:45, Jiri Olsa wrote:
> On Tue, Oct 09, 2018 at 11:59:31AM +0300, Alexey Budankov wrote:
<SNIP>
> 
>> @@ -1886,8 +1917,8 @@ static struct option __record_options[] = {
>>  	OPT_BOOLEAN(0, "dry-run", &dry_run,
>>  		    "Parse options then exit"),
>>  #ifdef HAVE_AIO_SUPPORT
>> -	OPT_CALLBACK_NOOPT(0, "aio", &record.opts,
>> -		     NULL, "Enable asynchronous trace writing mode",
> 
> hum, why removing --aio option? I though we will have:
> 
>   perf record --aio ....           # enables aio with default settings
>   perf record --aio-cblocks=3 ...  # enabled aio with aio-cblocks=3

It is possible to avoid the complication using only one --aio option like this:

   perf record --aio ...    # enables aio with default (=1)
   perf record --aio=4 ...  # enables aio with parameter = 4

--aio-cblocks=4 still works when specified like --aio=4.

Thanks,
Alexey