linux-kernel - Collecting both remote and "local" coverage with KCOV

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Message-ID: <20201116023846.awjtbzh2o2yj4fvn@mozz.bu.edu>
Date:   Sun, 15 Nov 2020 21:38:46 -0500
From:   Alexander Bulekov <alxndr@...edu>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Collecting both remote and "local" coverage with KCOV

Hello,
I'm trying to collect coverage over the syscalls issued by my process,
as well as the kthreads spawned as a result of these syscalls
(eg coverage over vhost ioctls and the worker kthread). Is there a way
to collect coverage with both KCOV_REMOTE_ENABLE(with common_handle) and
KCOV_ENABLE, simultaneously? 

Based on the code it seems that these two modes are mutually
exclusive within a single task, but I don't think this is mentioned in
the Documentation, so I want to make sure I'm not missing something.
Thank you
-Alex