linux-kernel - Re: [PATCH v3 2/4] Add fp argument to print functions

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Date:   Wed, 18 Oct 2017 09:22:09 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     禹舟键 <ufo19890607@...il.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Milian Wolff <milian.wolff@...b.com>,
        Wind Yu <yuzhoujian@...ichuxing.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] Add fp argument to print functions

Em Wed, Oct 18, 2017 at 07:54:13PM +0800, 禹舟键 escreveu:
> Hi, Arnaldo
> I have done it as you said in v1 patch, but David had told me to separate
> the patch :"Makes all those related functions receive the FILE pointer"  to
> two patches. Below is his opinion.
> 
> On 9/13/17 9:10 AM, yuzhoujian wrote:
> > @@ -1621,8 +1634,12 @@ static int process_comm_event(struct perf_tool
> *tool,
> >               sample->tid = event->comm.tid;
> >               sample->pid = event->comm.pid;
> >       }
> > -     print_sample_start(sample, thread, evsel);
> > -     perf_event__fprintf(event, stdout);
> > +     if (tool->orientation_output == false)
> > +             fp = stdout;
> > +     else
> > +             fp = orientation_file;
> > +     fprint_sample_start(sample, thread, evsel, fp);
> > +     perf_event__fprintf(event, fp);
> >       ret = 0;
> >  out:
> >       thread__put(thread);
> 
> "The subject of this patch is replacing printf and stdout with fprintf
> and a given fp. Please keep it to that one change. Meaning the above
> setting of fp something other than stdout should be a separate patch.

I have done exactly as described in my and David's suggestion, this
"orientation_file" change is not in my patch.

> And it would be best to have the fp selection in a helper, versus the
> same change in so many places. "
> 
> So, what should I do??

Please consider continuing from the other suggestion I made in a recent
message, about how to use evsel->priv to store the perf evsel FILE
pointer.

- Arnaldo