linux-kernel - File not found: /sys/kernel/debug/tracing/events/syscalls

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Date:   Tue, 27 Nov 2018 20:52:00 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     open list <linux-kernel@...r.kernel.org>
Cc:     Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        rostedt@...dmis.org, mingo@...hat.com
Subject: File not found: /sys/kernel/debug/tracing/events/syscalls

While debugging the selftests/bpf: get_cgroup_id_user test failure on arm64
where the test is expecting trace file
/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id
but this path not enabled after enabling required kernel configuration also.
CONFIG_FTRACE_SYSCALLS=y

strace output:
open(\"/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id\",
O_RDONLY) = -1 ENOENT (No such file or directory)

This problem noticed on Linux mainline kernel version 4.20.0-rc3.

Best regards
Naresh Kamboju