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

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Date:   Wed, 28 Nov 2018 01:11:22 +0900
From:   Masami Hiramatsu <masami.hiramatsu@...aro.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: File not found: /sys/kernel/debug/tracing/events/syscalls

Hi,

I found that the commit 4378a7d4be30 ("arm64: implement syscall
wrappers") changed
the syscall wrapper function names by adding __arm64_ prefix. So arm64
kernel should
have its own arch_syscall_match_sym_name().

Thank you,

2018年11月28日(水) 0:22 Naresh Kamboju <naresh.kamboju@...aro.org>:
>
> 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



-- 
Masami Hiramatsu