linux-kernel - Re: [PATCH] Introduced new tracing mode KCOV_MODE

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Message-ID: <09e2b5a1-16ad-037a-88d2-6b29bc3fea6a@alexander-lochmann.de>
Date:   Mon, 22 Mar 2021 22:14:26 +0100
From:   Alexander Lochmann <info@...xander-lochmann.de>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Miguel Ojeda <ojeda@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrew Klychkov <andrew.a.klychkov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Aleksandr Nogikh <nogikh@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Maciej Grochowski <maciej.grochowski@...me>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Introduced new tracing mode KCOV_MODE_UNIQUE.



On 22.03.21 13:17, Miguel Ojeda wrote:
> Hi Alexander,
> 
> On Sun, Mar 21, 2021 at 8:14 PM Alexander Lochmann
> <info@...xander-lochmann.de> 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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