On Mon, Nov 16, 2020 at 9:35 AM Dmitry Vyukov <dvyu...@google.com> wrote: > > On Mon, Nov 16, 2020 at 3:39 AM Alexander Bulekov <alx...@bu.edu> wrote: > > > > 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. > > Hi Alex, > > Yes, it's probably not supported within a single task. The easiest way > to verify is to try it ;) > > It is possible to collect both coverages, but you will need 2 threads > (one just to set up remote KCOV). > > Unless I am missing any fundamental limitations, I would say it would > be reasonable to support this within a single task as well.
I think the reason we did that initially, is because we don't care about normal coverage for USB emitting pseudo-syscalls. Filed a bug for this: https://bugzilla.kernel.org/show_bug.cgi?id=210225
