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Subject: Re: [PATCH v5 3/7] perf record: Move setting dummy tracking before
 record__init_thread_masks()
From:   Yang Jihong <yangjihong1@huawei.com>
To:     Ian Rogers <irogers@google.com>
CC:     <peterz@infradead.org>, <mingo@redhat.com>, <acme@kernel.org>,
        <mark.rutland@arm.com>, <alexander.shishkin@linux.intel.com>,
        <jolsa@kernel.org>, <namhyung@kernel.org>,
        <kan.liang@linux.intel.com>, <james.clark@arm.com>,
        <tmricht@linux.ibm.com>, <ak@linux.intel.com>,
        <anshuman.khandual@arm.com>, <linux-kernel@vger.kernel.org>,
        <linux-perf-users@vger.kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>
References: <20230804020741.99806-1-yangjihong1@huawei.com>
 <20230804020741.99806-4-yangjihong1@huawei.com>
 <b8741176-dc9c-1ddb-6bb5-85293f3c61f7@intel.com>
 <CAP-5=fV2u+HwxwuCmz0uSo_dvbFAwwjvK_QvkorB+qbtMnwtZg@mail.gmail.com>
 <29111bbc-61af-4452-bf73-c3b32221989f@huawei.com>
Message-ID: <753ead6a-3113-5e10-3249-09a33042b8f3@huawei.com>
Date:   Thu, 17 Aug 2023 20:27:05 +0800
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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@intel.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