linux-kernel - Re: [PATCH v6 2/7] perf evlist: Add evlist__findnew_tracking

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Date:   Fri, 25 Aug 2023 13:58:29 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     Ian Rogers <irogers@...gle.com>
CC:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>,
        <adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
        <james.clark@....com>, <tmricht@...ux.ibm.com>,
        <ak@...ux.intel.com>, <anshuman.khandual@....com>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH v6 2/7] perf evlist: Add evlist__findnew_tracking_event()
 helper

Hello,

On 2023/8/25 12:55, Ian Rogers wrote:
> On Sun, Aug 20, 2023 at 6:30 PM Yang Jihong <yangjihong1@...wei.com> wrote:
>>
>> Currently, intel-bts, intel-pt, and arm-spe may add a dummy event for
>> tracking to the evlist. We may need to search for the dummy event for
>> some settings. Therefore, add evlist__findnew_tracking_event() helper.
> 
> Given the first two sentences I don't understand why this is
> evlist__findnew_tracking_event and not evlist__findnew_dummy_event?
> Are you setting tracking on other events other than dummy? If so, then
> the commit message isn't right. If not then I'd prefer not to use
> tracking event in the function name.
> 
Yes, add this helper to find tracking event for some setting, will 
modify commit message, like as follows:

Currently, intel-bts, intel-pt, and arm-spe may add tracking event to 
the evlist. We may need to search for the tracking event for
some settings. Therefore, add evlist__findnew_tracking_event() helper.

>>
>> evlist__findnew_tracking_event() also deal with system_wide maps if
>> system_wide is true.
> 
> Could you fix the explanation here, what does "deal with system_wide"
> mean? A kerneldoc comment and explanation of the system_wide argument
> would be useful.
> 
In the next version, details will be described as follows:

If system_wide is true, evlist__findnew_tracking_event() set the cpu map 
of the evsel to all online CPUs.

Is such an explanation okay?

Thanks,
Yang