Re: [PATCH] Introduced new tracing mode KCOV_MODE_UNIQUE.

[Alexander Lochmann]

On 22.03.21 13:17, Miguel Ojeda wrote:
> Hi Alexander,
> 
> On Sun, Mar 21, 2021 at 8:14 PM Alexander Lochmann
> <info@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>> diff --git a/Documentation/dev-tools/kcov.rst b/Documentation/dev-tools/kcov.rst
>> index d2c4c27e1702..e105ffe6b6e3 100644
>> --- a/Documentation/dev-tools/kcov.rst
>> +++ b/Documentation/dev-tools/kcov.rst
>> @@ -127,6 +127,86 @@ That is, a parent process opens /sys/kernel/debug/kcov, enables trace mode,
>>  mmaps coverage buffer and then forks child processes in a loop. Child processes
>>  only need to enable coverage (disable happens automatically on thread end).
>>
>> +If someone is interested in a set of executed PCs, and does not care about
>> +execution order, he or she can advise KCOV to do so:
> 
> Please mention explicitly that KCOV_INIT_UNIQUE should be used for
> that, i.e. readers of the example shouldn't need to read every line to
> figure it out.
> 
>> +    #define KCOV_INIT_TRACE                    _IOR('c', 1, unsigned long)
> 
> Trace is not used in the example.
> 
>> +       /* KCOV was initialized, but recording of unique PCs hasn't been chosen yet. */
>> +       KCOV_MODE_INIT_UNQIUE = 2,
> 
> Typo? It isn't used?
It is a typo. It should be used...
> 
> PS: not sure why I was Cc'd, but I hope that helps.
Thx for your feedback. get_maintainer.pl told me to include you in Cc.

Cheers,
Alex
> 
> Cheers,
> Miguel
> 

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