linux-kernel - Re: [PATCH v2 1/2] perf cs-etm: Set branch instruction flags in packet

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Date:   Thu, 6 Dec 2018 13:33:03 +0800
From:   leo.yan@...aro.org
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mike Leach <mike.leach@...aro.org>,
        Robert Walker <robert.walker@....com>,
        Al Grant <Al.Grant@....com>,
        Coresight ML <coresight@...ts.linaro.org>,
        Andi Kleen <andi@...stfloor.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH v2 1/2] perf cs-etm: Set branch instruction flags in
 packet

On Wed, Dec 05, 2018 at 10:40:07AM -0700, Mathieu Poirier wrote:

[...]

> > > >  static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
> > > >                             const void *context,
> > > >                             const ocsd_trc_index_t indx __maybe_unused,
> > > > @@ -484,6 +650,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
> > > >             break;
> > > >     }
> > > >
> > > > +   cs_etm_decoder__set_sample_flags(context, elem);
> > > > +
> > >
> > > I was toying with the idea of setting the flags in each of the case statement
> > > found in cs_etm_decoder__gen_trace_elem_printer().  But that would move more
> > > code around and the end result would be the same so let's keep it that way until
> > > we have a good reason to split it.
> >
> > Do you sugguest to keep current implementation rather than to
> > split flags setting in each of the case statement in
> > cs_etm_decoder__gen_trace_elem_printer()?
> >
> > I am not 100% sure if I understand correctly for "split it" (split flags
> > setting vs split functions).  So please correct me if I misunderstand
> > this.
> 
> I find function cs_etm_decoder__set_sample_flags() overly long.  Since
> the case statements in it are the same as the ones in
> cs_etm_decoder__gen_trace_elem_printer() a different way to proceed
> would be to do flag setting there rather than all in
> cs_etm_decoder__set_sample_flags().  But that would introduce more
> code modification and tighter coupling.  Since I don't have another
> alternative I am suggesting to keep the current implementation.

Thanks for clarification.