linux-kernel - Re: [PATCH v5 3/7] perf record: Move setting dummy tracking before record__init_thread

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Date:   Thu, 17 Aug 2023 20:27:05 +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>,
        <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>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v5 3/7] perf record: Move setting dummy tracking before
 record__init_thread_masks()

Hello,

On 2023/8/15 9:57, Yang Jihong wrote:
> Hello,
> 
> On 2023/8/15 4:29, Ian Rogers wrote:
>> On Thu, Aug 3, 2023 at 11:58 PM Adrian Hunter 
>> <adrian.hunter@...el.com> wrote:
>>>
>>> On 4/08/23 05:07, Yang Jihong wrote:
>>>> When dummy tracking go system wide, the mmap cpu mask is changed.
>>
>> As previously commented, can we improve the quality of the function
>> names and commit messages? This sentence is particularly difficult to
>> understand, I don't understand it.
> 
> OK. The commit messages will be modified. Please check whether the 
> following description is clear:
> 
> User space tasks can migrate between CPUs, so when tracing selected 
> CPUs, sideband for all CPUs is needed. In this case set the cpu map of 
> the evsel to all online CPUs. This may modify the original cpu map of 
> the evlist.
> Therefore, need to check whether the preceding scenario exists before 
> record__init_thread_masks().
> Dummy tracking has been set in record__open(), move it before 
> record__init_thread_masks() and add a helper for unified processing.
> 
Ian, do you have any questions about the commit message above? If it's 
okay, I'll send the next version as above.

Thanks,
Yang