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Date:   Fri, 8 Oct 2021 19:37:17 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc:     Yucong Sun <fallentree@fb.com>, bpf <bpf@vger.kernel.org>,
        Andrii Nakryiko <andrii@kernel.org>,
        Yucong Sun <sunyucong@gmail.com>
Subject: Re: [PATCH bpf-next v6 00/14] selftests/bpf: Add parallelism to
 test_progs
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On Fri, 8 Oct 2021 15:42:31 -0700
Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:

> orgot to actually cc Steven, oops. Steven, I've run into the problem
> when running a few selftests that do uprobe/kprobe attachment. At some
> point, they started complaining that files like
> /sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id don't
> exist. And this condition persisted. When I checked
> /sys/kernel/debug/tracing in QEMU, it was empty. Is this a known
> problem?

The tracefs directory should automatically be mounted in the debugfs
"tracing" directory when debugfs is mounted.

Does /sys/kernel/tracing exist?

-- Steve