linux-kernel - Re: [PATCH 2/2] perf pmu: Improve CPU core PMU HW event list ordering

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Date:   Mon, 15 Jun 2020 15:51:19 +0100
From:   John Garry <john.garry@...wei.com>
To:     Namhyung Kim <namhyung@...nel.org>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linuxarm@...wei.com>,
        Ian Rogers <irogers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] perf pmu: Improve CPU core PMU HW event list ordering

On 15/06/2020 15:36, Namhyung Kim wrote:>>   static int cmp_sevent(const 
void *a, const void *b)
>> @@ -1416,6 +1417,12 @@ static int cmp_sevent(const void *a, const void *b)
>>                  if (n)
>>                          return n;
>>          }
>> +
>> +       if (as->is_cpu && !bs->is_cpu)
>> +               return -1;
>> +       else if (!as->is_cpu && bs->is_cpu)
>> +               return 1;
>> +
> This can be:
> 
>          if (as->is_cpu != bs->is_cpu)
>                  return bs->is_cpu - as->is_cpu;
> 

That's more concise, but maybe not as readable at a glance. I don't mind 
though, so can change.

Thanks,
John