linux-kernel - Re: [PATCH 01/22] libperf: Add comments to perf_cpu

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Date:   Fri, 10 Dec 2021 16:08:12 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     John Garry <john.garry@...wei.com>,
        Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vineet Singh <vineet.singh@...el.com>,
        James Clark <james.clark@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, eranian@...gle.com
Subject: Re: [PATCH 01/22] libperf: Add comments to perf_cpu_map.

Em Wed, Dec 08, 2021 at 06:34:14AM -0800, Ian Rogers escreveu:
> On Wed, Dec 8, 2021 at 4:06 AM John Garry <john.garry@...wei.com> wrote:
> >
> > On 08/12/2021 02:45, Ian Rogers wrote:
> > > diff --git a/tools/lib/perf/include/internal/cpumap.h b/tools/lib/perf/include/internal/cpumap.h
> > > index 840d4032587b..1c1726f4a04e 100644
> > > --- a/tools/lib/perf/include/internal/cpumap.h
> > > +++ b/tools/lib/perf/include/internal/cpumap.h
> > > @@ -4,9 +4,16 @@
> > >
> > >   #include <linux/refcount.h>
> > >
> > > +/**
> > > + * A sized, reference counted, sorted array of integers representing CPU
> > > + * numbers. This is commonly used to capture which CPUs a PMU is associated
> > > + * with.
> > > + */
> > >   struct perf_cpu_map {
> > >       refcount_t      refcnt;
> > > +     /** Length of the map array. */
> > >       int             nr;
> > > +     /** The CPU values. */
> > >       int             map[];
> >
> > would simply more distinct names for the variables help instead of or in
> > addition to comments?

Well, in this case the typical usage doesn't help, as 'struct
perf_cpu_map' are being used simply as "map" where it should be cpu_map,
so we would have:

	cpu_map->nr

And all should be obvious, no? Otherwise we would have redundant 'cpu',
like:

	cpu_map->nr_cpus

And 'map' should really be entries, so:

	cpu_map->entries[index];

Would be clear enough, o?
 
> Thanks John! I agree. The phrase that is often used is intention
> revealing names. The kernel style for naming is to be brief:
> https://www.kernel.org/doc/html/v4.10/process/coding-style.html#naming
> These names are both brief. nr is a little unusual, of course an
> integer is a number - size and length are common names in situations
> like these. In this case number makes sense as it is the number of
> CPUs in the array, and there is a certain readability in saying number
> of CPUs and not length or size of CPUs. The name map I have issue
> with, it is always a smell if you are calling a variable a data type.
> Given the convention in the context of this code I decided to leave
> it. Something like array_of_cpu_values would be more intention
> revealing but when run through the variable name shrinkifier could end
> up as just being array, which would be little better than map.
> 
> The guidance on comments is that they are good and to focus on the
> what of what the code is doing:
> https://www.kernel.org/doc/html/v4.10/process/coding-style.html#commenting
> refcnt was intention revealing enough and so I didn't add a comment to it.
> 
> > Generally developers don't always check comments where the struct is
> > defined when the meaning could be judged intuitively
> 
> Agreed. I think there could be a follow up to change to better names.
> As I was lacking a better suggestion I think for the time being, and
> in this patch set, we can keep things as they are.
> 
> Thanks,
> Ian
> 
> > Thanks,
> > John
> >

-- 

- Arnaldo