linux-kernel - Re: [PATCH v13 3/3]: perf record: extend trace writing to multi AIO

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Date:   Sun, 14 Oct 2018 16:06:59 +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 v13 3/3]: perf record: extend trace writing to multi AIO

On Fri, Oct 12, 2018 at 07:28:23PM +0300, Alexey Budankov wrote:
> Hi,
> 
> On 12.10.2018 17:17, Jiri Olsa wrote:
> > On Thu, Oct 11, 2018 at 09:59:19PM +0300, Alexey Budankov wrote:
> > 
> > SNIP
> > 
> >> @@ -1490,6 +1514,13 @@ static int perf_record_config(const char *var, const char *value, void *cb)
> >>  		var = "call-graph.record-mode";
> >>  		return perf_default_config(var, value, cb);
> >>  	}
> >> +#ifdef HAVE_AIO_SUPPORT
> >> +	if (!strcmp(var, "record.aio")) {
> >> +		rec->opts.nr_cblocks = strtol(value, NULL, 0);
> >> +		if (!rec->opts.nr_cblocks)
> >> +			rec->opts.nr_cblocks = 1;
> >> +	}
> >> +#endif
> >>  
> >>  	return 0;
> >>  }
> >> @@ -1882,8 +1913,8 @@ 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",
> >> +	OPT_CALLBACK(0, "aio", &record.opts,
> >> +		     "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
> >>  		     record__aio_parse),
> > 
> > it stoped work with no argument:
> > 
> > [jolsa@...va perf]$ ./perf record --aio ls
> > Error:
> > You may not have permission to collect system-wide stats.
> 
> This is the fix below. However, perf record --aio -- ls works without it.
> I will resend the whole patch kit.

looks good, thanks

jirka